TRANE YSJ072 Precedent Cooling and Gas Electric Instruction Manual

YSJ072 Precedent Cooling and Gas Electric

Product Information

This user manual is for the Packaged Rooftop Air Conditioners
PrecedentTM Cooling and Gas/Electric models with model numbers
YSJ072 – YSJ300. The manual provides installation, operation, and
maintenance instructions for these units.

It is important to note that only qualified personnel should
install and service the equipment. The installation, starting up,
and servicing of heating, ventilating, and air-conditioning
equipment can be hazardous and requires specific knowledge and
training. Improper installation or adjustment by an unqualified
person can result in death or serious injury. Always observe all
precautions mentioned in the literature, as well as on the tags,
stickers, and labels attached to the equipment.

The manual also includes important safety warnings, cautions,
notices, and environmental concerns related to the product. It
emphasizes the need for proper field wiring and grounding, personal
protective equipment (PPE), following EHS policies, and avoiding
hazards such as explosion, fire, and safety hazards.

Furthermore, the document states that it is the property of
Trane and may not be used or reproduced without written permission.
Trane reserves the right to revise the publication and make changes
to its content without obligation to notify any person.

Product Usage Instructions

Before operating or servicing the unit, it is essential to
thoroughly read this manual. The strict observance of precautions
mentioned in the manual ensures personal safety and proper
operation of the machine.

When installing or performing maintenance on the unit, only
qualified personnel should be involved. If you are not qualified,
seek professional assistance to avoid potential hazards.

Ensure proper field wiring and grounding according to NEC
(National Electrical Code) and your local/state/national electrical
codes. Failure to follow these requirements can result in fire or
electrocution hazards.

Wear appropriate Personal Protective Equipment (PPE) for the job
to protect yourself from potential electrical, mechanical, and
chemical hazards. Follow the precautions mentioned in the manual,
as well as on the tags, stickers, and labels attached to the
equipment.

Follow EHS (Environmental, Health, and Safety) policies to avoid
any accidents or injuries.

Avoid storing or using gasoline or other flammable vapors and
liquids near the appliance. If you detect a gas leak, immediately
call your gas supplier and follow their instructions. If you cannot
reach your gas supplier, call the fire department.

Always follow the instructions provided in the manual to prevent
any safety hazards, injuries, or damage to equipment or
property.

Installation, Operation, and Maintenance
Packaged Rooftop Air Conditioners PrecedentTM Cooling and Gas/ Electric
Standard Efficiency 6 to 25 Tons ­ 60 Hz

Model Numbers: YSJ072 – YSJ300

SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air- conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

August 2023

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Introduction

Read this manual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as required. Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION NOTICE

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.
Indicates a situation that could result in equipment or property-damage only accidents.

Important Environmental Concerns
Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants.
Important Responsible Refrigerant Practices
Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified according to local rules. For the USA, the Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.
WARNING
Personal Protective Equipment (PPE) Required!
Failure to wear proper PPE for the job being undertaken could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the instructions below:
· Before installing/servicing this unit, technicians MUST put on all PPE required for the work being undertaken (Examples; cut resistant gloves/ sleeves, butyl gloves, safety glasses, hard hat/ bump cap, fall protection, electrical PPE and arc flash clothing). ALWAYS refer to appropriate Safety Data Sheets (SDS) and OSHA guidelines for proper PPE.
· When working with or around hazardous chemicals, ALWAYS refer to the appropriate SDS and OSHA/GHS (Global Harmonized System of Classification and Labelling of Chemicals) guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.
· If there is a risk of energized electrical contact, arc, or flash, technicians MUST put on all PPE in accordance with OSHA, NFPA 70E, or other country-specific requirements for arc flash protection, PRIOR to servicing the unit. NEVER PERFORM ANY SWITCHING, DISCONNECTING, OR VOLTAGE TESTING WITHOUT PROPER ELECTRICAL PPE AND ARC FLASH CLOTHING. ENSURE ELECTRICAL METERS AND EQUIPMENT ARE PROPERLY RATED FOR INTENDED VOLTAGE.

©2023

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WARNING
Follow EHS Policies!
Failure to follow instructions below could result in death or serious injury.
· All Trane personnel must follow the company’s Environmental, Health and Safety (EHS) policies when performing work such as hot work, electrical, fall protection, lockout/tagout, refrigerant handling, etc. Where local regulations are more stringent than these policies, those regulations supersede these policies.
· Non-Trane personnel should always follow local regulations.
WARNING
Hazard of Explosion or Fire!
Failure to follow instructions could result in death or serious injury and equipment or property damage. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. IF YOU SMELL GAS, follow instructions below:
· Do not try to light any appliance. · Do not touch any electrical switch. · Do not use any phone in your building. · Open windows and doors.
· Alert others and evacuate building immediately. · From a phone outside of the building,
immediately call your gas supplier. Follow the gas supplier’s instructions. If you cannot reach your gas supplier, call the fire department.
WARNING
Safety Hazards!
Failure to follow instructions below could result in death or serious injury and equipment or property damage.
· Do not use this furnace if any portion has been under water as it may have rendered the unit hazardous to operate. Immediately call a qualified service technician to inspect the furnace and to replace any part or the control system and any gas control which has been under water.
· Should overheating occur, or the unit gas valve fail to shut off, close the gas valve to the furnace before shutting off the electrical supply.
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Introduction
Copyright
This document and the information in it are the property of Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.
Trademarks
All trademarks referenced in this document are the trademarks of their respective owners.
Revision History
· Updated digit 7 in the Unit model number in the document.
· Updated Door Handles section in General Information chapter.
· Added TCO1 tripping values – Modulating gas table and Supply and Manifold Pressure Requirements Modulating gas table to the Installation chapter.
· Added DAS Horizontal Conversions for Select Modulating Gas Heat Units section to the Installation chapter.
· Added Modulating Gas Heat models to Requirements of Gas Heat section in the Installation chapter.
· Updated Condensate trap installation figure in the Installation chapter.
· Added Furnace condensate drain section to the Installation chapter.
· Added Ignition Module – Modulating Gas section to the Unit Start-up chapter.
· Added LCU R6 schematics and component in the Wiring Diagrams chapter.
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Table of Contents
Model Number Description . . . . . . . . . . . . . . . . . . . 6
General Information . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Exterior Inspection . . . . . . . . . . . . . . . . . . . . . 8 Inspection for Concealed Damage. . . . . . . . 8
Unit Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Door Handles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Nameplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Compressor Nameplate . . . . . . . . . . . . . . . . . . . . 9
Microchannel Coil Barcode ID . . . . . . . . . . . . . . . 9
LonTalk Communication Interface (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
BACnet Communications Interface (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
System Input Devices and Functions . . . . . . . . . 9 Supply Fan Failure . . . . . . . . . . . . . . . . . . . . . 9 Clogged Filter Switch (Optional). . . . . . . . . . 9 Condensate Drain Pan Overflow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Compressor Disable (CPR1/2) . . . . . . . . . . . 9
Low Pressure Control . . . . . . . . . . . . . . . . . . . . . 10
High Pressure Control . . . . . . . . . . . . . . . . . . . . . 10
Zone Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Manual Changeover (BAYSENS106) . . . . . . . . . . . . . . . . . . . . . . 10 Manual/Automatic Changeover (BAYSENS108) . . . . . . . . . . . . . . . . . . . . . . 10 Wall Mounted Relative Humidity Sensor (BAYSENS036) . . . . . . . . . . . . . . . 10 Duct Mounted Relative Humidity Sensor (BAYSENS037) . . . . . . . . . . . . . . . 10 Integrated Comfort System (BAYSENS073) . . . . . . . . . . . . . . . . . . . . . . 10 Integrated Comfort System (BAYSENS074) . . . . . . . . . . . . . . . . . . . . . . 10 Remote Zone Sensor (BAYSENS016) . . . . . . . . . . . . . . . . . . . . . . 10 Remote Zone Sensor (BAYSENS077) . . . . . . . . . . . . . . . . . . . . . . 10 Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . 10 High Temperature Sensor (FIAHTST001) . . . . . . . . . . . . . . . . . . . . . . . 10 Digital Display Zone Sensor (BAYSENS135) . . . . . . . . . . . . . . . . . . . . . . 10 Touch Screen Programmable Zone Sensor (BAYSENS800) . . . . . . . . . . . . . . . . 11
Evaporator Frost Control. . . . . . . . . . . . . . . . . . . 11
Discharge Line Temp Switch (DLTS) . . . . . . . . 11
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Smoke Detector Sensor (Optional) . . . . . . . . . . 11 Phase Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Precautionary Measures. . . . . . . . . . . . . . . . . . . 12 First Aid Measures . . . . . . . . . . . . . . . . . . . . . . . . 12
Dimensions and Weights. . . . . . . . . . . . . . . . . . . . 13 Dimensional Data. . . . . . . . . . . . . . . . . . . . . . . . . 13 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Lifting and Rigging . . . . . . . . . . . . . . . . . . . . . . . . 28
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Horizontal Units . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Downflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Rigging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 General Unit Requirements . . . . . . . . . . . . . . . . 32 Factory Installed Economizer . . . . . . . . . . . 32 External Vent Hood Installation. . . . . . . . . . 32 Temperature Limit Switch Usage . . . . . . . . 33 Horizontal Discharge Conversion (6 to 12.5 Ton Units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 DAS Horizontal Conversions (Select Modulating Gas Heat Units) . . . . . . . . . . . . . . . . 35 Conversion to Horizontal — Models YSJ072BH, YSJ(090,102,120,150) B(H,L). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Conversion to Horizontal — Model YSJ072***BL . . . . . . . . . . . . . . . . . . . . . . . . . 36 TCO1 Instructions . . . . . . . . . . . . . . . . . . . . . . . . 37 Return Air Smoke Detector. . . . . . . . . . . . . . . . . 37 Air-Fi® Wireless Communication Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Main Electrical Power Requirements . . . . . . . . 39 Through-the-Base Gas Installation . . . . . . . . . . 39 Requirements of Gas Heat . . . . . . . . . . . . . . . . . 41 Modulating Gas Heat . . . . . . . . . . . . . . . . . . 41 Condensate Drain Configuration . . . . . . . . . . . . 41 Drain Pan Removal (Units with Condensate Overflow Switch Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Furnace Condensate Drain . . . . . . . . . . . . . 42 Filter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Field Installed Power Wiring. . . . . . . . . . . . . . . . 43
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Table of Contents

Main Unit Power . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Standard Wiring . . . . . . . . . . . . . . . . . . . . . . 43 Optional TBUE Wiring (Through-theBase Electrical Option) . . . . . . . . . . . . . . . . 43 Field-Installed Control Wiring . . . . . . . . . . . 44 Control Power Transformer . . . . . . . . . . . . . 44 Controls using 24 Vac . . . . . . . . . . . . . . . . . 44 Controls using DC Analog Input/ Outputs (Standard Low Voltage Multi conductor Wire). . . . . . . . . . . . . . . . . . . . . . . 46 DC Conductors . . . . . . . . . . . . . . . . . . . . . . . 47
Space Temperature Averaging . . . . . . . . . . . . . 47
Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Voltage Imbalance . . . . . . . . . . . . . . . . . . . . . . . . 50
Electrical Phasing (Three Phase Motors). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Compressor Crankcase Heaters . . . . . . . . . . . . 51
Symbio Controls. . . . . . . . . . . . . . . . . . . . . . . . . . 51
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sequence of Operation . . . . . . . . . . . . . . . . . . . . 53
Ignition Module ­ Two-stage . . . . . . . . . . . . . . . 53
Ignition Module ­ Modulating Gas . . . . . . . . . . . 53 Call for Heat. . . . . . . . . . . . . . . . . . . . . . . . . . 53 Ignition and Operational Failures During a Call for Heat. . . . . . . . . . . . . . . . . . 54 Recovery from Lockout (E Code) . . . . . . . . 54
Return Air Smoke Detector. . . . . . . . . . . . . . . . . 55
Compressor Start-Up . . . . . . . . . . . . . . . . . . . . . 55
Hot Gas Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Gas Heat Units . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Final System Setup . . . . . . . . . . . . . . . . . . . . . . . 56
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Monthly Maintenance . . . . . . . . . . . . . . . . . . . . . 57 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Return Air Smoke Detector Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 57 Condensate Overflow Switch . . . . . . . . . . . 57 Cooling Season. . . . . . . . . . . . . . . . . . . . . . . 57 Heating Season. . . . . . . . . . . . . . . . . . . . . . . 57 Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 58 Microchannel (MCHE) Coils . . . . . . . . . . . . 58
Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . 59
Final Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Gas Heat Operation and Maintenance . . . . . . . 68
Gas Heat Unit General Information . . . . . . . . . . 68
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Heating System . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Heating Cycle Operation . . . . . . . . . . . . . . . 69 Safety Controls . . . . . . . . . . . . . . . . . . . . . . . 69
Heating System Start-Up . . . . . . . . . . . . . . . . . . 69
Heating System Shutdown . . . . . . . . . . . . . . . . . 70 Turning Off Gas to Unit . . . . . . . . . . . . . . . . 71
Heating System Maintenance . . . . . . . . . . . . . . 71 Condensate Overflow Sensor (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Electric Air Conditioner . . . . . . . . . . . . . . . . . . . . 73 YSJ Precedent Models . . . . . . . . . . . . . . . . 73

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Model Number Description

Digit 1 — Unit Function
Y = DX Cooling, Gas Heat
Digit 2 — Cooling Efficiency
S = Standard Efficiency
Digit 3 — Refrigerant
J = R-410A
Digit 4,5,6 — Nominal Gross Cooling Capacity (MBh) 072 = 6 Ton 090 = 7.5 Ton 102 = 8.5 Ton 120 = 10 Ton 150 = 12.5 Ton 180 = 15 Ton 210 = 17.5 Ton 240 = 20 Ton 300 = 25 Ton Digit 7 — Major Design Sequence
Digit 8 — Voltage Selection
3 = 208­230/60/3 4 = 460/60/3 W = 575/60/3 Digit 9 — Unit Controls
S = SymbioTM 700
Digit 10 — Heat Type
0 = Base Model A = Stainless Steel Gas Heat B = Modulating Gas Heat
Digit 11 — Heating Capacity
L = Low Gas Heat M = Medium Gas Heat H = High Gas Heat

Digit 12, 13 — Service Sequence

Digit 18 — Through-the-Base Provisions

** = Factory Assigned
Digit 14 — Fresh Air Selection
0 = No Fresh Air A = Manual Outside Air Damper 0­50% B = Motorized Outside Air Damper 0­50% C = Economizer, Dry Bulb 0­100% without Barometric Relief D = Economizer, Dry Bulb 0­100% with Barometric Relief E = Economizer, Reference Enthalpy 0­100% without Barometric Relief F = Economizer, Reference Enthalpy 0­100% with Barometric Relief G = Economizer, Comparative Enthalpy 0­100% without Barometric Relief H = Economizer, Comparative Enthalpy 0­100% with Barometric Relief K = Downflow Low Leak Economizer, Dry Bulb with Barometric Relief M = Downflow Low Leak Economizer, Reference Enthalpy with Barometric Relief P = Downflow Low Leak Economizer, Comparative Enthalpy with Barometric Relief R= Downflow Low Leak Economizer, Differential Dry Bulb with Barometric Relief
Digit 15 — Supply Fan/Drive Type/Motor
0 = Multi-Speed Motor 1 = Optional Oversized/High Static Motor 2 = Single Zone Variable Air Volume with Standard Motor 3 = Single Zone Variable Air Volume with Oversized/High Static Motor 4 = Multiple Zone Variable Air Volume with Standard Motor 5 = Multiple Zone Variable Air Volume with Oversized/High Static Motor
Digit 16 — Hinged Service Access/Filters
0 = Standard Panels/Standard Filters A = Hinged Access Panels/Standard Filters B = Standard Panels/2 inch MERV 8 Filters C = Hinged Access Panels/2 inch MERV 8 Filters D = Standard Panels/2 inch MERV 13 Filters E = Hinged Access Panels/2 inch MERV 13 Filters

0 = No Through-the-Base Provisions A = Through-the-Base Electric B = Through- the-Base Gas Piping C = Through-the-Base Electric and Gas Piping
Digit 19 — Disconnect/Circuit Breaker (threephase only) 0 = No Disconnect/No Circuit Breaker 1 = Unit Mounted/Non-Fused Disconnect 2 = Unit Mounted Circuit Breaker
Digit 20– Convenience Outlet
0 = No Convenience Outlet A = Unpowered 20A Convenience Outlet B = Powered 15A Convenience Outlet (three-phase only)
Digit 21– Communications Options
0 = No Communications Interface 1 = Advanced Controller with BACnet® Communications Interface 2 = Advanced Controller with LonTalk® Communications Interface 3 = Advanced Controller with Air-Fi® Communications Interface
Digit 22– Refrigeration System Option
0 = Standard Refrigeration System A = Dehumidification Option
Digit 23– Controls Expansion Module
0 = None 1 = XM-30 Expansion Module 2 = XM-32 Expansion Module 3 = XM-30 and XM-32 Expansion Module 4 = XM­30 Expansion Module (Qty 2) 5 = XM­32 Expansion Module (Qty 2)
Digit 24– Smoke Detector
0 = No Smoke Detector A = Return Air Smoke Detector B = Supply Air Smoke Detector C = Supply and Return Air Smoke Detectors,

Digit 17 — Condenser Coil Protection

0 = Standard Coil 1 = Condenser with CompleteCoatTM

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Digit 25– System Monitoring Controls
0 = No Monitoring Control 1 = Clogged Filter Switch 2 = Condensate Overflow Switch 3 = Discharge Air Sensing Tube 4 = Clogged Filter Switch and Condensate Overflow Switch 5 = Clogged Filter Switch and Discharge Air Sensing Tube 6 = Condensate Overflow Switch and Discharge Air Sensing Tube 7 = Clogged Filter Switch, Condensate Overflow Switch and Discharge Air Sensing Tube
Digit 26– Not Used
Digit 27– Unit Hardware Enhancements
0 = No Enhancements 1 = Stainless Steel Drain Pan
Digit 28– Short Circuit Current Rating
0 = Standard (5k) SCCR Marking A = Tier 2 (=65K) SCCR Marking
Digit 29– Low Ambient
0 = None A = Low Ambient Cooling to 0°F

Model Number Description

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7

General Information
Unit Inspection
To protect against loss due to damage incurred in transit, perform inspection immediately upon receipt of the unit. Check carefully for shipping damage. If any damage is found, report it immediately, and file a claim against the transportation company.
Exterior Inspection
If the job site inspection reveals damage or material shortages, file a claim with the carrier immediately. Specify the type and extent of the damage on the bill of lading before signing. Notify the appropriate sales representative. Important: Do not proceed with installation of a damaged
unit without sales representative approval. · Inspect the complete exterior for signs of shipping
damages to unit or packing material. · Verify that the nameplate data matches the sales order
and bill of lading. · Verify that the unit is properly equipped and there are
no material shortages. · Verify the power supply complies with the unit
nameplate specifications.
Inspection for Concealed Damage
Inspect the components for concealed damage as soon as possible after delivery and before it is stored. If concealed damage is discovered: · Notify the carrier’s terminal of the damage immediately
by phone and by mail. · Concealed damage must be reported within 15 days. · Request an immediate, joint inspection of the damage
with the carrier and consignee. · Stop unpacking the unit. · Do not remove damaged material from receiving
location. · Take photos of the damage, if possible. · The owner must provide reasonable evidence that the
damage did not occur after delivery.
Unit Storage
Take precautions to prevent condensate from forming inside the unit’s electrical compartments and motors if: · The unit is stored before it is installed; or, · The unit is set on the roof curb, and temporary heat is
provided in the building. Isolate all side panel service entrances and base pan openings (e.g., conduit holes, S/A and R/ A openings, and flue openings) from the ambient air until the unit is ready for start-up.
8

Note: Do not use the unit heater for temporary heat without first completing the start-up.
The manufacturer will not assume any responsibility for equipment damage resulting from condensate accumulation on the unit electrical and/or mechanical components.
Unit Description
· Before shipment, each unit is leak tested, dehydrated, charged with refrigerant and compressor oil, and run tested for proper control operation.
· The condenser coils are all aluminum microchannel. · Direct-drive, vertical discharge condenser fans are
provided with built-in thermal overload protection. · All units come with standard SymbioTM 700 control
system with advanced diagnostics.
Door Handles
Door handles rotate 180 degrees for use on either left- or right-handed doors. Handles will be in the vertical position when latched, as shown in the following figure. After each use, return door handles to the latched and locked position.. Figure 1. Door handles
To lock: 1. Verify handle is in the vertical (latched) position. 2. Using a Phillips head screwdriver, push and rotate the
handle screw clockwise 1/4 turn. To unlock: Use a Phillps head screwdriver to push and rotate handle screw counterclockwise 1/4 turn.
Unit Nameplate
A Mylar unit nameplate is located on the unit corner support next to the filter access panel. It includes the unit model number, serial number, electrical characteristics, refrigerant charge, and other pertinent unit data.
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General Information

Compressor Nameplate
The nameplate for the compressors are located on the side of the compressor.
Microchannel Coil Barcode ID
Barcode decal used for coil part identification can be located on the header and top of coil’s inlet/outlet side.
LonTalk Communication Interface (Optional)
The SymbioTM controllers supports communication with LonTalk® open protocol applications. An advanced license is required to enable this feature. The LonTalk module is available factory supplied or as a field-installed kit. For more details, refer to Integration Guide LonTalk® Integration to PrecedentTM Packaged Rooftop AirConditioners with SymbioTM 700 Controls (BAS-SVP063EN).
BACnet Communications Interface (Optional)
The SymbioTM controller provides integrated communication with BACnet® open protocol applications. An advanced license is required to enable this feature. When enabled, the following selections are available: BACnet MS/TP, BACnet IP, or BACnet Zigbee® (Air-Fi®). For more details, refer to BACnet® and ModbusTM Integration to PrecedentTM Packaged Rooftop AirConditioners with SymbioTM 700 Controls Integration Guide (BAS-SVP062-EN).
System Input Devices and Functions
The SymbioTM 700 controller requires a zone sensor or thermostat input to operate the unit in a CVZT or VVZT configuration. Note: Use of a conventional thermostat will reduce unit
functionality.
The number of available modes depends on the type of zone sensor or thermostat selected. Descriptions of the basic input devices used with the Symbio 700 network are provided to acquaint the operator with the various modules. Refer to the unit schematic for specific module connections. The following controls are available from the factory for field installation.
Supply Fan Failure
Supply fan proving is active when the supply fan is commanded ON. The supply fan speed must be greater than 30 rpm for 40 continuous seconds. If the supply fan speed falls below 30 rpm, supply fan failure diagnostic is generated, and operation is stopped.
RT-SVX071D-EN

Clogged Filter Switch (Optional)
The unit mounted clogged filter switch monitors the pressure differential across the return air filters. It is mounted in the filter section and is connected to the Fresh Air Options Module. A diagnostic signal is sent to the controller if the pressure differential across the filters is at least 0.5 inch w.c. The contacts will automatically open when the pressure differential across the filters decreases to approximately 0.4 inch w.c. The clogged filter output is energized when the supply fan is operating and the clogged filter switch has been closed for at least 2 minutes. The system will continue to operate regardless of the status of the filter switch. For further details, refer to ACCSVN238*-EN.
Note: On units equipped with factory installed MERV 13 filters, a clogged filter switch with different pressure settings will be installed. This switch will close when the differential pressure is approximately 0.8 inch w.c. and open when the differential falls to 0.7 inch w. c.
Condensate Drain Pan Overflow Switch
A condensate overflow condition will be detected by a condensate overflow float switch. When the condensate level reaches the trip point, the diagnostic condition will be detected. When the condensate overflow input closes for six continuous seconds, the following actions will be taken by the SymbioTM 700 controls:
· An auto-reset diagnostic will be generated. All compressor or heating operations will be disabled immediately. Condenser fans and compressors will be de-energized. Supply fan operation will be shutdown.
· Once the overflow condition has been cleared and the input is open for 6 seconds, all diagnostic conditions will be cleared. The unit will return to normal operation. Auto-reset clearing will occur twice each time the unit is powered up. On the third occurrence, the unit will initiate a lock-out and require manual reset. If an autoreset overflow occurs once, but does not occur again for 72 hours, the trip counter will reset allowing more auto-resets to occur.
Compressor Disable (CPR1/2)
This input incorporates the low pressure control (LPC) of each refrigeration circuit.
If this circuit is open before the compressor is started, the compressor will not be allowed to operate. Anytime this circuit is opened for one continuous second during compressor operation, the compressor for that circuit is immediately turned OFF. The compressor will not be allowed to restart for a minimum of three minutes should the contacts close.
If four consecutive open conditions occur during the first 3 minutes of operation, the compressor for that circuit will be locked out, a diagnostic communicated to the remote panel (if installed), and a manual reset will be required to restart the compressor.
9

General Information
Low Pressure Control
When the LPC is opened for 1 continuous second, the compressor for that circuit is turned OFF. The compressor will not be allowed to restart for a minimum of 3 minutes.
If four consecutive open conditions occur during an active call for cooling, the compressor will be locked out, a diagnostic generated, if applicable, and a manual reset required to restart the compressor.
High Pressure Control
The high pressure controls are wired in series between the compressor outputs on the SymbioTM controller and the compressor contactor coils. If the high pressure control switch opens, the controller senses a lack of current while calling for cooling and locks the compressor out.
If four consecutive open conditions occur during an active call for cooling, the compressor will be locked out, a diagnostic generated, if applicable, and a manual reset required to restart the compressor.
Zone Sensors
Manual Changeover (BAYSENS106)
This sensor features three system switch settings (Heat, Cool, and Off) and two fan settings (On and Auto). It is a manual changeover control with single setpoint.
Manual/Automatic Changeover (BAYSENS108)
This sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan settings (On and Auto). It is a manual or auto changeover control with dual setpoint capability. It can be used with a remote zone temperature sensor BAYSENS077.
Wall Mounted Relative Humidity Sensor (BAYSENS036)
Field installed, wall mounted humidity sensor that measures temperature and relative humidity. Relative humidity input is used to control activation of dehumidification
Duct Mounted Relative Humidity Sensor (BAYSENS037)
Field installed, duct mounted humidity sensor that measures temperature and relative humidity. Relative humidity input is used to control activation of dehumidification.
Integrated Comfort System (BAYSENS073)
This sensor features remote zone sensing and timed override with override cancellation. It is used with a Trane Integrated ComfortTM building management system.
10

Integrated Comfort System (BAYSENS074)
This sensor features single setpoint capability and timed override with override cancellation. It is used with a Trane Integrated ComfortTM building management system.
Remote Zone Sensor (BAYSENS016)
This bullet type temperature sensor can be used for outside air (ambient) sensing, return air temperature sensing, supply air temperature sensing, remote temperature sensing (uncovered). Wiring procedures vary according to the particular application and equipment involved. Refer to the unit’s wiring diagrams for proper connections.
Remote Zone Sensor (BAYSENS077)
This sensor can be used with BAYSENS106, 108, 110, 800 Remote Panels. When this sensor is wired to a BAYSENS800 Remote Panel, wiring must be 18 AWG Shielded Twisted Pair (Belden 8760 or equivalent). Refer to the specific Remote Panel for wiring details.
Thermostat
The unit must have a thermostat to operate.
· BAYSTAT151
One Heat/One Cool Auto changeover digital display thermostat.
· BAYSTAT155
Three Heat/Two Cool Auto changeover display thermostat.
· BAYSENS150
Three Heat/Two Cool Auto changeover digital display thermostat. Seven day programmable thermostat with night setback.
High Temperature Sensor (FIAHTST001)
This sensor connects to the SymbioTM 700 Emergency Stop Input and provides high limit “shutdown” of the unit. The sensor is used to detect high temperatures due to a high thermal event in the air conditioning or ventilation ducts. The sensor is designed to mount directly to the sheet metal duct. Each kit contains two sensors. The return air duct sensor (X13100040010) is set to open at 135ºF. The supply air duct sensor (X13100040020) is set to open at 240ºF. The control can be reset after the temperature has been lowered approximately 25ºF below the cutout setpoint.
Digital Display Zone Sensor (BAYSENS135)
LCD display provides heat, cool, auto, on, and off status. Display includes two temperature setpoints, and a lockable setting with °F or °C indicators.
RT-SVX071D-EN

General Information

Touch Screen Programmable Zone Sensor (BAYSENS800)
This sensor uses a BACnet® MS/TP link to communicate zone temperature and setpoints. Sensor includes Auto, Heat, Cool, or Off system switch, as well as Fan Auto or On switch. This is a seven day programmable thermostat with night setback.
Notes: · Not compatible with VAV units. Requires BACnet® communications. · For additional sensors, refer to the product catalog.
Note: BASYSENS800* with BACnet® enabled on the SymbioTM controller will report fault detection and diagnostics at the zone sensor. This functionality is only applicable if the customer does not have a building management system, and the unit is running standalone with the BAYSENS800.
Evaporator Frost Control
Frostat is standard on all units.
Discharge Line Temp Switch (DLTS)
The DLTS is looped in series with HPC and LPC. It prevents the compressor from overheating (over 300°F dome temp) in case of indoor fan failure (cooling) or outdoor fan failure (heating).
Smoke Detector Sensor (Optional)
This sensor provides high limit shutdown of the unit and requires a manual reset. The sensor is used to detect smoke in the air conditioning or ventilation ducts.

Notes: ·
·
· ·

The supply air smoke detector samples supply air. The return smoke detectors sample return air. The smoke detectors are designed to shut off the unit if smoke is sensed. This function is performed by sampling the airflow entering the unit at the return air opening. Follow the instructions provided below to assure that the airflow through the unit is sufficient for adequate sampling. Failure to follow these instructions will prevent the smoke detectors from performing its design function. Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters. To insure that airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required. Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit. In order for the supply air smoke detector or return air smoke detector to properly sense smoke in the supply air stream or return air stream, the air velocity entering the smoke detector unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will develop an airflow velocity that falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

Phase Monitor
This sensor monitors voltage between the 3 conductors of the 3 phase power supply. Two LED lights are provided:
· The green light indicates that a balanced 3 phase supply circuit is properly connected.
· The red light indicates that unit operation has been prevented. There are two conditions that will prevent unit operation:
­ The power supply circuit is not balanced with the proper phase sequence of L1, L2, L3 for the 3 conductors of a 3 phase circuit.
­ The line to line voltage is not between 180 volts and 633 volts.

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11

Pre-Installation
WARNING
Fiberglass Wool!
Exposure to glass wool fibers without all necessary PPE equipment could result in cancer, respiratory, skin or eye irritation, which could result in death or serious injury. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation. You MUST wear all necessary Personal Protective Equipment (PPE) including gloves, eye protection, a NIOSH approved dust/mist respirator, long sleeves and pants when working with products containing fiberglass wool.
Precautionary Measures:
· Avoid breathing fiberglass dust.
· Use a NIOSH approved dust/mist respirator.
· Avoid contact with the skin or eyes. Wear longsleeved, loose-fitting clothing, gloves, and eye protection.
· Wash clothes separately from other clothing; rinse washer thoroughly.
· Operations such as sawing, blowing, tear-out, and spraying may generate fiber concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respirator.
First Aid Measures:
· Eye Contact – Flush eyes with water to remove dust. If symptoms persist, seek medical attention.
· Skin Contact – Wash affected areas gently with soap and warm water after handling.

Precautionary Measures
· Avoid breathing fiberglass dust.
· Use a NIOSH approved dust/mist respirator.
· Avoid contact with the skin or eyes. Wear long-sleeved, loose-fitting clothing, gloves, and eye protection.
· Wash clothes separately from other clothing: rinse washer thoroughly.
· Operations such as sawing, blowing, tear-out, and spraying may generate fiber concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respiration in these situations.
First Aid Measures
Eye Contact – Flush eyes with water to remove dust. If symptoms persist, seek medical attention.
Skin Contact – Wash affected areas gently with soap and warm water after handling.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.

12

RT-SVX071D-EN

Dimensions and Weights
Dimensional Data
Figure 2. 6 to 10 tons standard efficiency

TOP PANEL

CONTROL PANEL ACCESS

CONDENSER FAN

EVAPORATOR SECTI ON ACCESS PANEL
ALTERNATE CONDENSATE CONNECTI ON 3/ 4 – 14 NPT DI A. HOLE

50-7/ 8″ [ 1293]

88-1/ 8″ [ 2238] 1/ 2 NPT GAS CONNECTI ON ( 80 MBh, 120 MBh)
3/ 4 NPT GAS CONNECTI ON ( 150 MBh, 200 MBh, 250 MBh)
AND ALL MOD GAS

27-5/ 8″ [ 700] 47-7/ 8″ [ 1217]

COMPRESSOR ACCESS PANEL

9-5/ 8″

11-1/4″ [244]

15-1/4″ [286] [ 388]

4-7/ 8″ [ 123] 9″ [ 229]

UNI T CONTROL WI RE 2″ ( 50 MM) DI A. HOLE SERVI CE GAUGE PORT ACCESS 1- 3/ 8″ ( 35 MM) DI A. HOLE UNI T POWER WI RE 2″ ( 50 MM) DI A. HOLE
53-1/ 4″ [ 1352]

Figure 3. 6 to 10 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

3 5/8″ 92 MM
4″ 102 MM

17 1/2″ 444 MM

9 7/8″ 251 MM

17 1/2″ 444 MM

RETURN
32 1/8″ 816 MM

SUPPLY
33″ 838 MM

4 1/8″ 104 MM

27 5/8″ 701 MM

THROUGH THE BASE CONDENSATE

40 3/4″ 1035 MM
THROUGH THE BASE ELECTRICAL

5″ 127 MM
5 7/8″ 149 MM
10 7/8″ 276 MM

2 3/4″ 71 MM 3 3/4″ 95 MM

6 1/2″ 165 MM

RT-SVX071D-EN

13

Dimensions and Weights
Figure 4. 6 to 10 tons standard efficiency ­ horizontal airflow supply/return
3-7/ 4″ [ 97]

32-1/ 4″ [ 820]

9-3/ 8″ [ 237]

16-3/ 4″ [ 426]

19-1/ 4″ [ 490]

32-1/ 4″ [ 820]

27-5/ 8″ [ 700]

4-1/ 4″ [ 109]

3/ 4 – 14 NPT DI A. HOLE CONDENSATE DRAI N

Figure 5. 6 to 10 tons standard efficiency — unit clearance and roof opening

CLEARANCE 36″ (914 MM)

CLEARANCE HORIZONTAL FLOW – 18″ (457 MM) DOWNFLOW – 36″ (914 MM)

88 5/8″ 2251 MM

46″ 1168 MM

CLEARANCE 48″ (1219 MM)

CLEARANCE FROM TOP OF UNIT 72″

TYPICAL ROOF OPENING

46″ 1168 MM

53 1/4″ 1352 MM

CLEARANCE 36″ (914 MM)

14

RT-SVX071D-EN

Dimensions and Weights

Figure 6. 6 to 10 tons standard efficiency ­ roof curb

CLEARANCE

36″ (914
46 3/8″ 1178 MM

MM)

34 3/8″ 873 MM

14″ 355 MM

RETURN

1 3/4″ 44 MM

1″ 25 MM

417801M/4M”16265851/M”M8M”M41780C1LMC/E2ML2A”E5R1AMA”RMNACN28E0C04E15183/M”26″M(“4(59714M28MM133)M07F)/MO8F”MRORHODROIWZONNFLTOAWL

SUPPLY 34 3/8″

873 MM

CLEARANCE

48″

84 1/2″ 2146 MM
(1219 MM)

2″ 51 MM

2″ 51 MM

49 7/8″ 1267 MM

50 3/8″ 1280 MM
CLEARANCE

36″

(914

MM)

Figure 7. 6 to 10 tons standard efficiency ­ downflow duct connections, field fabricated

33 3/4″ 857 MM

17 3/4″ 451MM

17 3/4″ 451MM

33 3/4″ 857 MM

ALL FLANGES 1 1/4″ (31 MM)

RETURN SUPPLY

RT-SVX071D-EN

15

Dimensions and Weights
Figure 8. 6 to 10 tons standard efficiency ­ swing diameter for hinged door(s) option

21 3/8″ 543 MM

17″ 432 MM
Applicable to Y_C models only

34 5/8″ 879 MM

Figure 9. 6 to 25 tons standard efficiency– gas pipe height

A

Note: Height of gas pipe required from inside unit base to gas shut off assembly (factory provided).

Model YSJ (072 ­ 150) YSJ (180 ­ 300)

Dimension A

inch

mm

4 5/8

117

1 3/6

30

16

RT-SVX071D-EN

Figure 10. 12.5 tons standard efficiency

Dimensions and Weights
I NDOOR TOP PANEL CONTROL BOX SECTI ON ACCESS PANEL OUTDOOR TOP PANEL

EVAPORATOR SECTI ON ACCESS PANEL
ALTERNATE CONDENSATE DRAI N CONNECTI ON 3/ 4 – 14 NPT DI A HOLE

50-7/ 8″ [ 1293]

27-5/ 8″ [ 700] 47-7/ 8″ [ 1217] 99-5/ 8″ [ 2532] 1/ 2 NPT CONNECTI ON ( 120 MBh)
3/ 4 NPT GAS CONNECTI ON ( 150 MBh, 200 MBh, 250 MBh)
UNI T POWER WI RE 1- 3/ 8″ ( 35MM) DI A. HOLE

CONDENSER COI L
63-1/ 8″ [ 1604] SERVI CE GAUGE PORT ACCESS 1- 3/ 8″ ( 35MM) DI A. HOLE UNI T CONTROL WI RE 2″ ( 50MM) DI A. HOLE
UNI T POWER WI RE 2″ ( 50MM) DI A. HOLE
COMPRESSOR ACCESS PANEL UNI T POWER WI RE 1- 3/ 8″ ( 35MM) DI A. HOLE

Figure 11. 12.5 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

3 5/8″ 92 MM
4″ 102 MM

17 1/2″ 444 MM

9 7/8″ 251 MM

17 1/2″ 444 MM

RETURN
32 1/8″ 816 MM

SUPPLY
33″ 838 MM

4 1/8″ 104 MM

THROUGH THE BASE ELECTRICAL
THROUGH THE BASE CONDENSATE
4 5/8″ 119 MM

2 3/4″ 71 MM
6 3/8″ 163 MM

27 5/8″ 701 MM

THROUGH THE BASE GAS

5 7/8″ 149 MM

42 3/16″ 1072 MM
51 3/16″ 1316 MM

RT-SVX071D-EN

17

Dimensions and Weights
Figure 12. 12.5 tons standard efficiency ­ horizontal airflow, supply and return
3 7/8″ 98 MM

9 3/8″ 238 MM

32 1/4″ 832 MM

SUPPLY
19 1/4″ 489 MM

RETURN
16 3/4″ 425 MM

32 1/4″ 832 MM
4 3/4″ 120 MM

27 5/8″ 701 MM

4 1/4″ 108 MM

3/4 – 14 NPT DIA. HOLE CONDENSATE DRAIN

Figure 13. 12.5 tons standard efficiency ­ unit clearance and roof opening

CLEARANCE 36″ (914 MM)

CLEARANCE HORIZONTAL FLOW – 18″ (457 MM) DOWNFLOW 36″ (914 MM)

CLEARANCE FROM TOP OF UNIT 72″

TYPICAL ROOF OPENING

99 11/16″ 2532 MM

46″ 1168 MM

CLEARANCE 48″ (1219 MM)

46″ 1168 MM

63 3/16″ 1605 MM
CLEARANCE 36″ (914 MM)

18

RT-SVX071D-EN

Dimensions and Weights

Figure 14. 12.5 tons standard efficiency ­ roof curb

56 3/8″ 1432 MM

34 3/8″ 873 MM

18 1/2″ 470 MM
1″ 25 MM

14″ 356 MM
1 3/4″ 44 MM

6 5/8″ 168 MM

CLCELAERAARNANCECE183″6″(4(59714MMMM) )FOFORRHDOORIWZNOFNLTOAWL

1″ 25 MM

18 1/2″ 470 MM

80 1/2″ 2045 MM

83 7/8″ 2130 MM

1″ 25 MM

34 3/8″ 873 MM

84 1/2″ 2146 MM
2″ 51 MM
2″ 51 MM
Figure 15. 12.5 tons standard efficiency ­ swing diameter for hinged door(s) option

59 7/8″ 1521 MM
60 3/8″ 1534 MM

21-3/ 4″ [ 554]

17-3/ 8″ [ 443]

11″ [ 279]

35″ [ 890]

RT-SVX071D-EN

19

Dimensions and Weights
Figure 16. 6 to 12.5 tons standard efficiency ­ economizer, manual or motorized fresh air damper

BAROMETRI C RELI EF HOOD
7-3/ 4″ [ 198]

ECONOMI ZER HOOD

12″ [ 303]

16-3/ 4″ [ 424]

7-1/ 4″ [ 185]

DI MENSI ONS EXTENDS TO 21- 5/ 8″ ( 549MM) WHEN POWERED EXHAUST I S COUPLED WI TH LOW LEAK ECONOMI ZER

20

RT-SVX071D-EN

Figure 17. 6 to 12.5 tons standard efficiency ­ power exhaust

Dimensions and Weights

5-5/ 8″ [ 144]

20-1/ 2″ [ 520]

ECONOMI ZER HOOD

RT-SVX071D-EN

21

Dimensions and Weights
Figure 18. 15 to 25 tons standard efficiency ­ power exhaust

4.4 21.4
Figure 19. 15 to 25 tons standard efficiency
GAS CONNECTION 3/4 NPT (250, 320, 400 MBh)
2” ELECTRICAL CONN SINGLE POINT POWER “T” MODELS ONLY
EVAPORATOR SECTION ACCESS PANEL
CONDENSATE DRAIN

7.8 22.7

INDOOR TOP PANEL

CONTROL BOX SECTION ACCESS PANEL
OUTDOOR TOP PANEL

59” D.0 CAB OR [1499] 66” D.1 CAB [1676]

44 3/4” [1135] 55” [1398] 65 5/8” 123” [1668] [3124]

31 7/8” [810] UNIT CONTROL WIRE

UNIT CONTROL WIRE 2” (50 MM) DIA. HOLE
UNIT POWER WIRE 2” (50 MM) DIA. HOLE
Note: Cabinet size for 15 to 15 ton units: D0.
22

87” [2210]

CONDENSER COIL

SERVICE GAUGE PORT ACCESS 1 3/8” (35 MM) DIA. HOLE

RT-SVX071D-EN

Dimensions and Weights

Figure 20. 15 to 25 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

6 5/8” 167 MM

7″ 177 MM

14 3/8″ 365 MM

40″ 1002MM

19 3/8″ 488MM

14 7/16″ 365MM

73 5/8″ 1868MM

65″ 1652MM

55 3/8” 1404MM
55.0577 [1398.467] 55.2977 [1404.563]

8” 205MM

8 3/8″ 212MM

THROUGH THE BASE ELECTRICAL

THROUGH THE BASE GAS (Y_J MODELS ONLY)

Figure 21. 15 to 25 ton standard efficiency ­ horizontal airflow supply/return

48″ 1223MM

23 11/16” [603] 22 3/8” [570] 4 9/16” [114] 7 15/16” [202] 14 1/16” [357]

5 1/4” [133]

25 1/2” [648]

SUPPLY
26 3/4” [679]

RETURN
20 ” [508]

46 1/2” [1181]

29” [737]

6” [153]

5 1/2” [141]

RT-SVX071D-EN

23

Dimensions and Weights

Figure 22.

15 to 25 tons standard efficiency ­ unit clearance and roof opening
CLEARANCE 36″ 914 MM

CLEARANCE 68″ 1727 MM

CLEARANCE FORM TOP OF UNIT 72″ MM (1829 MM)

UNIT OUTLINE

81″ 2057 MM

ROOF OPENING

76 1/2″ 1943 MM

CLEARANCE 48″ 1219 MM

FRONT OF UNIT CLEARANCE 60″ 1524 MM
Figure 23. 15 to 25 tons standard efficiency ­ roof curb

1 1/2″ (38 MM) PERIMETER CURB FLANGE
7 7/6″ 189 MM

1 13/16″ 46 MM

1″ 25 MM

22 1/4″ 565 MM

23 1/4″ 591 MM

116 7/8″ 2969 MM 1″ 25 MM
28 9/16″ 725 MM

69 1/2″ 1765 MM

14 1/16″ 357 MM

2″ 51 MM

117 3/16″ 2977 MM

7 1/2″ 191 MM

1″ 25 MM
81″ 2057 MM

24

RT-SVX071D-EN

Dimensions and Weights
Figure 24. 15 to 25 ton standard efficiency ­ swing diameter for hinged door(s) option

32″ 8 0 9 MM

30″ 7 5 4 MM

36″ 9 0 7 MM

RT-SVX071D-EN

25

Dimensions and Weights

Clearances
Figure 25, p. 26 illustrates the minimum operating and service clearances for either a single or multiple unit installation. These clearances are the minimum distances necessary to assure adequate serviceability, cataloged unit

capacity, and peak operating efficiency. Providing less than the recommended clearances may result in condenser coil starvation, “short-circuiting” of exhaust and economizer airflows, or recirculation of hot condenser air.

Figure 25. Typical installation clearances for single and multiple unit applications

Side by Side Note 1

End to End Note 1, 2

7’0″ 2134 MM

6’0″ 1829 MM

Notes:
1. When equipped with economizer or barometric relief damper, clearance distance is to be measured from protruding hood instead of base.
2. Clearance is the same if any unit is rotated 180 degrees.

3’0″ 914 MM
for D cabinet 4’0″ 1219 MM

Single Unit
3’0″ 914 MM

4’0″ 1219 MM
5’0″ for D cabinet 1525 MM
3’0″ 914 MM 5’8″ for D cabinet 1727 MM

Weights

Table 1. Model weights, corner weights (lbs) and center of gravity dimensions (in.)

Tons

Unit Model No.

Model Weights(a)

Shipping

Net

Corner Weights(b)

A

B

C

D

Center of Gravity (in.)

Length

Width

6

YSJ072

1107

1009

331

309

178

191

43

19

7.5

YSJ090

1111

1013

333

310

178

191

43

19

8

YSJ102

1127

1029

338

315

181

194

43

19

10

YSJ120

1137

1039

341

318

183

196

43

19

12.5

YSJ150

1512

1318

385

389

273

270

50

26

15

YSJ180

2220

2000

671

492

354

483

52

36

17.5

YSJ210

2250

2030

672

509

366

484

53

36

20

YSJ240

2320

2100

754

516

337

493

50

34

25

YSJ300

2370

2150

746

529

363

512

51

35

(a) Weights are approximate. Weights do not include additional factory or field installed options/accessories. For option/accessory additional weights to be added to unit weight, reference the following table.
(b) Corner weights are given for information only.

26

RT-SVX071D-EN

Figure 26. Corner weights

Cent er of Gravit y Lengt h

A

B

Cent er of Gravit y Widt h

Dimensions and Weights

D

C

Cent er of Gravit y

Table 2. Factory installed options (FIOPS)/accessory net weights (lb)

Accessory

YSJ072-120 6, 7.5, 8.5, 10 Tons

Barometric Relief

10

Economizer

36

Hinged Doors

12

Low Leak Economizer – Downflow

91

Low Leak Economizer – Horizontal

—

Manual Outside Air Damper

26

Motorized Outside Air Damper

30

Oversized Motor

14

Powered Convenience Outlet

38

Powered Exhaust

80

Reheat Coil

16

Roof Curb

105

Smoke Detector, Supply

5

Smoke Detector, Return

7

Stainless Steel Heat Exchanger

6

Through-the-Base Electrical

13

Through-the-Base Gas

5

Unit Mounted Circuit Breaker

5

Unit Mounted Disconnect

5

Notes: 1. Weights for options not listed are <5 lbs. 2. Net weight should be added to unit weight when ordering factory-installed accessories.

3. Weights are approximate.

YSJ150 12.5 Tons
10 36 12 91 — 26 30 — 50 80 20 111 5 7 6 13 5 5 5

YSJ180-300 15, 17.5, 20, 25 Tons
40 91 20 150 180 15 82 30 50 110 33 235 5 5 5 10 10 10 10

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27

Dimensions and Weights

Lifting and Rigging
WARNING
Heavy Object!
Failure to follow instructions below could result in unit dropping which could result in death or serious injury, and equipment or property-only damage. Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables (chains or slings), hooks, and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift.
WARNING
Improper Unit Lift!
Failure to properly lift unit in a LEVEL position could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Test lift unit approximately 24 inches (61 cm) to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level.
Figure 27. Rigging and center of gravity — 6 to 12.5 tons

Figure 28. Rigging and center of gravity — 15 to 25 tons

CENTER OF GRAVI TY LENGTH

CENTER OF GRAVI TY WI DTH

28

RT-SVX071D-EN

Installation
Horizontal Units
If the unit is installed at ground level, elevate it above the snow line. Provide concrete footings at each support location with a full perimeter support structure or a slab foundation for support. Refer to the weights information in the Dimensions and Weights chapter for unit operating and point loading weights when constructing a footing foundation.
If anchoring is required, anchor the unit to the slab using hold down bolts or isolators. Isolators should be installed to minimize the transmission of vibrations into the building.
WARNING
Risk of Roof Collapsing!
Failure to ensure proper structural roof support could cause the roof to collapse, which could result in death or serious injury and property damage. Confirm with a structural engineer that the roof structure is strong enough to support the combined weight of the roofcurb, the unit, and any accessories.
For rooftop applications, confirm the roof is strong enough to support the combined unit and support structural weight. Refer to maximum unit and corner weights (center of gravity) dimensions in the Dimensions and Weights section for the unit operating weights. If anchoring is required, anchor the unit to the roof with hold-down bolts or isolators.
Check with a roofing contractor for proper waterproofing procedures.
Ductwork
Supply and return air openings as viewed from the rear of the unit are shown in the following drawings.
Figure 29. 6 to 10 tons standard efficiency ­ horizontal airflow supply/return
3-7/ 4″ [ 97]

4-1/ 4″ [ 109] RT-SVX071D-EN

32-1/ 4″ [ 820]

9-3/ 8″ [ 237]

16-3/ 4″ [ 426]

19-1/ 4″ [ 490]

32-1/ 4″ [ 820]

27-5/ 8″ [ 700]

3/ 4 – 14 NPT DI A. HOLE CONDENSATE DRAI N

Figure 30. 12.5 tons standard efficiency ­ horizontal airflow, supply and return
3 7/8″ 98 MM

4 1/4″ 108 MM

9 3/8″ 238 MM

32 1/4″ 832 MM

SUPPLY
19 1/4″ 489 MM

RETURN
16 3/4″ 425 MM

32 1/4″ 832 MM
4 3/4″ 120 MM

27 5/8″ 701 MM

3/4 – 14 NPT DIA. HOLE CONDENSATE DRAIN

Figure 31. 15 to 25 ton standard efficiency ­ horizontal airflow supply/return

5 1/4” [133]

23 11/16” [603] 22 3/8” [570] 4 9/16” [114] 7 15/16” [202] 14 1/16” [357]

25 1/2” [648]

SUPPLY
26 3/4” [679]

RETURN
20 ” [508]

46 1/2” [1181]

29” [737]

6” [153]

5 1/2” [141]

Supply and return air openings as viewed from a downflow configuration are shown in the following drawings.
Elbows with turning vanes or splitters are recommended to minimize air noise due to turbulence and to reduce static pressure.
When attaching the ductwork to the unit, provide a water tight flexible connector at the unit to prevent operating sounds from transmitting through the ductwork.
All outdoor ductwork between the unit and the structure should be weather proofed after installation is completed.

29

Installation

Figure 32. 6 to 10 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

3 5/8″ 92 MM
4″ 102 MM

17 1/2″ 444 MM

9 7/8″ 251 MM

17 1/2″ 444 MM

RETURN
32 1/8″ 816 MM

SUPPLY
33″ 838 MM

4 1/8″ 104 MM

27 5/8″ 701 MM

THROUGH THE BASE CONDENSATE

40 3/4″ 1035 MM
THROUGH THE BASE ELECTRICAL

5″ 127 MM
5 7/8″ 149 MM
10 7/8″ 276 MM

2 3/4″ 71 MM 3 3/4″ 95 MM

6 1/2″ 165 MM

Figure 33. 12.5 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

3 5/8″ 92 MM
4″ 102 MM

17 1/2″ 444 MM

9 7/8″ 251 MM

17 1/2″ 444 MM

RETURN
32 1/8″ 816 MM

SUPPLY
33″ 838 MM

4 1/8″ 104 MM

THROUGH THE BASE ELECTRICAL
THROUGH THE BASE CONDENSATE
4 5/8″ 119 MM

2 3/4″ 71 MM
6 3/8″ 163 MM

27 5/8″ 701 MM

THROUGH THE BASE GAS

5 7/8″ 149 MM

42 3/16″ 1072 MM
51 3/16″ 1316 MM

Figure 34. 15 to 25 tons standard efficiency ­ downflow airflow supply/return, through-the-base utilities

6 5/8” 167 MM

7″ 177 MM

14 3/8″ 365 MM

40″ 1002MM

19 3/8″ 488MM

14 7/16″ 365MM

73 5/8″ 1868MM

65″ 1652MM

55 3/8” 1404MM
55.0577 [1398.467] 55.2977 [1404.563]

8” 205MM

8 3/8″ 212MM

THROUGH THE BASE ELECTRICAL

THROUGH THE BASE GAS (Y_J MODELS ONLY)

48″ 1223MM

Roof Curb
Downflow
The roof curbs for these units consists of a full perimeter enclosure to support the unit just inside of the unit base rail. The 12.5 ton units contain a support base alignment rail and will extend past the end of the roof curb.
Before installing the roof curb, verify:
· It is the correct curb for the unit.
· Necessary gaskets and hardware are available.
· Confirm required clearance for installation and operation.
· The curb should be level and square. The top surface of the curb must be level in order to confirm an adequate curb to unit seal.
WARNING
Combustible Materials!
Failure to maintain proper clearance between the unit and combustible materials could cause a fire which could result in death, serious injury, or property damage. Refer to unit nameplate and installation instructions for proper clearances.
Verify that appropriate materials were used in the construction of roof and ductwork. Combustible materials should not be used in the construction of ductwork or roof curb that is in close proximity to heater elements or any hot surface. Any combustible material on the inside of the unit base should be removed and replaced with appropriate material.
Step-by-step curb assembly and installation instructions ship with each accessory roof curb kit. Follow the instructions carefully to confirm proper fit-up when the unit is set into place. Note: To verify proper condensate flow during operation,
the unit (and curb) must be level.
If the unit is elevated, a field constructed catwalk around the unit is strongly recommended to provide easy access for unit maintenance and service.
Recommendations for installing the supply air and return air ductwork joining the roof curb are included in the curb instruction instructions. Curb ductwork must be fabricated and installed by the installing contractor before the unit is set into place. Important: For sound consideration, cut only the holes in
the roof deck for the ductwork penetrations. Do not cut out the entire roof deck within the curb perimeter.

30

RT-SVX071D-EN

Installation

Figure 35. View for base to roof curb alignment on C.0 cabinet on a 50-in. x 84-in. oof curb
Base Alignment Bracket
Figure 36. View for base to roof curb alignment on C.0 cabinet on a 60-in. x 84-in. roof curb
If a curb accessory kit is not used: · The ductwork can be attached directly to the factory-
provided flanges around the unit supply and return air openings. Use flexible duct connections at the unit. · For built up curbs supplied by others, gaskets must be installed around the curb perimeter flange and the supply and return air opening flanges.
Rigging WARNING
Heavy Object!
Failure to follow instructions below could result in unit dropping which could result in death or serious injury, and equipment or property-only damage. Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables (chains or slings), hooks, and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift. See Dimensions and Weights section for rigging illustration and center-of-gravity dimensional data. Refer to the typical unit operating weights table before proceeding.
RT-SVX071D-EN

1. Confirm unit does not need additional moves by fork lift. 2. Prepare unit for rigging as follows:
· 6 to 12.5 ton units: remove all drill screws fastening wood protection to metal base rail. Remove all screws securing wooden protection to wooden top crate.
· 15 to 25 ton units: remove the front base rail bumper protection.
Important: For unit protection, the top crate should remain in place during lifting. If it must be removed prior to lifting, protect unit from damage. Top crate must be removed prior to operation.
WARNING
Improper Unit Lift!
Failure to properly lift unit in a LEVEL position could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury, and equipment or property-only damage. Test lift unit approximately 24 inches (61 cm) to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level.
3. Rig the unit as shown in the weights section. Attach adequate strength lifting slings to all four lifting brackets in the unit base rail. Do not use cables, chains, or slings except as shown.
4. Install a lifting bar, as shown in the Dimensions and Weights chapter, to protect the unit and to facilitate a uniform lift. The minimum distance between the lifting hook and the top of the unit should be 7 feet.
5. Test-lift the unit to confirm it is properly rigged and balanced, make any necessary rigging adjustments.
Figure 37. Fork pockets — 6 to 10 ton standard efficiency units
Remove Two Fork Lift Brackets
Remove Two Metal Runners and Three Wooden Boards
31

Installation

Figure 38. Fork pockets — 12.5 ton standard efficiency units

NOTICE
Remove this Roof Crub Alignment Bracket Prior to Remove One Metal Runner Setting Unit onto 60×84-inch Roof Crub Only

Remove Two Wodden Boards

Remove 10 Fork Lift Brackets

Figure 39. Fork pockets — 15 to 25 ton standard efficiency units

Remove Fork Lift Brackets

Remove Wooden Boards
6. Lift the unit enough to allow the removal of base fork pocket protection components.
7. When C cabinet (digit 39 = C) units are installed on a smaller existing roof curb (50-inch x 84-inch) for replacement applications, do not remove alignment bracket. Use the bracket to properly align duct openings.
8. Downflow units: Align the base rail of the unit with the curb rail while lowering the unit onto the curb. Confirm the gasket on the curb is not damaged while positioning the unit.
General Unit Requirements
The following checklist is a summary of the steps required to successfully install a commercial unit. Installers should use this checklist to validate what is required in the installation process. It does not replace the detailed instructions called out in the applicable sections of this manual.

Check the unit for shipping damage and material shortage. File a freight claim and notify appropriate sales representative.
Verify correct model, options, and voltage from unit nameplate.
Verify the installation location of the unit will provide the required clearance for proper operation.
Assemble and install the roof curb (if applicable). Refer to the latest version of the curb installation instructions that ships with each curb kit.
Fabricate and install ductwork. Secure ductwork to curb.
If applicable, install pitch pocket for power supply through building roof.
Rig the unit.
Set the unit on the curb and verify the unit is level.
Confirm unit-to-curb seal is tight, without buckles or cracks.
Install and connect a condensate drain line to the evaporator drain connection.

Factory Installed Economizer
· Confirm the economizer has been pulled out into the operating position. Refer to the economizer installation instructions for proper position and setup.
· Install all access panels.

External Vent Hood Installation

Note: This procedure applies to 15 to 25 tons gas heat models.

1. Remove and discard the cover plate located on the gas heat panel.

Important: ·

Read the label located on the cover plate before discarding.

· Do not discard the fastening screws! They will be needed to install the vent hood.

32

RT-SVX071D-EN

Figure 40. Discard cover plate

Installation
Figure 42. Vent hood installation

SCREWS
2. Locate the vent hood behind the panel. Figure 41. Vent hood shipping location
Note: The above figure shows two-stage gas. Modulating gas is similar.
3. Install the vent hood on the gas heat panel using the screws removed in Step 1 and secure to the panel.

SCREWS

Temperature Limit Switch Usage

Units are factory shipped in the downflow discharge configuration but can be field converted to a horizontal discharge configuration. Some, but not all units require a different TCO1 limit switch, attached to the combustion blower motor (6 to 12.5 tons) or to the installed TCO1 limit switch (15 to 25 tons) if a horizontal discharge configuration is used.

If any of the units are installed in the downflow discharge configuration and have the alternate TCO1 limit switch provided, remove the additional TCO1 limit switch attached to the combustion blower motor (6 to 12.5 tons) or to the installed TCO1 limit switch (15 to 25 tons) and discard.
For detailed instructions, refer to “TCO1 Instructions,” p. 37.

Table 3. TC01 tripping values ­ two- stage gas

Tons 6 7.5 8.5 10
12.5 15

Unit Model Number
YSJ072(0,A)L YSJ072(0,A)M YSJ072(0,A)H YSJ090(0,A)L YSJ090(0,A)M YSJ090(0,A)H YSJ102(0,A)L YSJ102(0,A)M YSJ102(0,A)H YSJ120(0,A)L YSJ120(0,A)M YSJ120(0,A)H YSJ150(0,A)L YSJ150(0,A)M YSJ150(0,A)H YSJ180(0,A)L YSJ180(0,A)M YSJ180(0,A)H

TCO1 Tripping Values Downflow/Horizontal
105°F 120°F 140°F 120°F/110°F 130°F/135°F 125°F/150°F 120°F/110°F 130°F/135°F 125°F/150°F 135°F 125°F/140°F 130°F/150°F 125°F/130°F 130°F 110°F 140°F-3″/150-7″ 150°F-3″/195°F-3″ 150°F-3″/200°F-3″

RT-SVX071D-EN

33

Installation

Table 3. TC01 tripping values ­ two- stage gas (continued)

Tons 17.5 20 25

Unit Model Number
YSJ210(0,A)L YSJ210(0,A)M YSJ210(0,A)H YSJ240(0,A)L YSJ240(0,A)M YSJ240(0,A)H YSJ300(0,A)L YSJ300(0,A)M YSJ300***(0,A)H

TCO1 Tripping Values Downflow/Horizontal
140°F-3″/150-7″ 150°F-3″/195°F-3″ 150°F-3″/200°F-3″
140°F-3″/150-7″ 150°F-3″/195°F-3″ 150°F-3″/200°F-3″
140°F-3″/150-7″ 150°F-3″/195°F-3″ 150°F-3″/200°F-3″

Table 4. TCO1 tripping values ­ Modulating gas (digit 10 = B)

Tons 6 7.5 8.5 10
12.5 15 17.5 20 25

Unit Model Number
YSJ072BL YSJ072BH YSJ090BL YSJ090BH YSJ102BL YSJ102BH YSJ120BL YSJ120BH YSJ150BL YSJ150BH YSJ180BL YSJ180BH YSJ210BL YSJ210BH YSJ240BL YSJ240BH YSJ300BL YSJ300BH

TCO1 Tripping Values Downflow/Horizontal
145°F – 7″ stilt
145°F – 7″ stilt
145°F – 7″ stilt
145°F – 7″ stilt
145°F – 7″ stilt 105°F – 3″ stilt 125°F – 3″ stilt 140°F button 125°F – 3″ stilt 140°F button 125°F – 3″ stilt 140°F button 125°F – 3″ stilt 140°F button

Horizontal Discharge Conversion (6 to 12.5 Ton Units)

Notes: ·
·

15 to 25 ton units require purchase of an accessory kit for conversion. 6 to 12.5 ton units move the supply cover to return opening and return cover to supply opening.

Supplies needed by installer for conversion: 3 ounce tube of high temperature RTV sealant (500°F / 260°C, similar to Dow Corning 736).
Note: Failure to use recommended sealant could result in unit performance loss.

If a unit is to be converted to a horizontal discharge, the following conversion must be performed:

1. Remove RETURN and SUPPLY duct covers. 2. Place SUPPLY DUCT COVER over downflow return

34

opening (insulation side down).
3. Using self-drilling screws, (or screws removed from duct cover), screw through dimples to attach DUCT COVER to base.
Figure 43. Supply duct cover
Supply Duct Cover

Screw into four dimples on top edge
4. On original RETURN DUCT COVER, apply ¼-inch (6 mm.) continuous bead of 500°F RTV sealant around flange (opposite insulation side), as shown.
Figure 44. Return duct cover

RTV Sealant

5. Slide RETURN DUCT COVER (insulation side up) into supply opening until inward edge of duct cover engages with the two retaining clips on the duct flange. Secure outward edge of the duct cover with two screws.

Notes: ·

If unit is equipped with Return Air Smoke Detector, refer to field conversion instructions for horizontal discharge before installing return air duct.

· If unit is equipped with Discharge Air Sensing option refer to the following figure for proper tube positioning based on unit supply duct orientation / tonnage or see ACC-SVN240*EN for more details.

Important: For units with model number digit 10 = B modulating heat, DAS configuration change is required for horizontal duct hookup. See “DAS Horizontal Conversions (Select Modulating Gas Heat Units),” p. 35 for instructions.

RT-SVX071D-EN

Figure 45. Supply and return opening

Installation
Figure 47. DAS tubing detail view (downflow)

Supply duct cover
Insulation side down

Insulation side up

Return duct cover

6. After completing installation of the duct covers for horizontal discharge, proceed to TCO-1 instructions (two-stage gas only).
DAS Horizontal Conversions (Select Modulating Gas Heat Units)
For units with model number digit 10 = B, DAS system conversion may be required:
· 6 to 12.5 ton units (with model number digit 10 = B): conversion required to the DAS pickup tubes for horizontal duct configurations.
· 15 to 25 ton units (with model number digit 10 = B): no conversion required. The factory-installed DAS system is applicable to both downflow and horizontal.
Conversion to Horizontal — Models YSJ072BH, YSJ(090,102,120,150)B (H,L)
The figures shown below are representative. The heat exchanger size and discharge air tube geometry may vary with unit configuration. Any variations do not affect the conversion process.
Figure 46. DAS tubing factory installation for downflow

Vertical slide bracket
Horizontal conversion elbow – mounted to back of bracket

Vertical slide bracket covers holes in tubing
1. Reposition vertical slide bracket. a. Remove bracket screw. b. Slide the bracket down to expose the holes in the vertical tube. See Figure 48, p. 35, Figure 49, p. 36, and Figure 50, p. 36.
2. Reattach bracket screw to secure vertical slide bracket in new position.
3. Remove elbow from support bracket. 4. Remove pickup tube from vertical tube. 5. Install 90 degree elbow as shown in Figure 49, p. 36. 6. Reposition pickup tube as shown in Figure 49, p. 36. Important: To prevent stripping, do not over-tighten the
attachment screws. Figure 48. DAS tubing conversion components
Vertical slide bracket attachment screw Elbow attachment screws
Pickup sensing tube attachment screws Pickup sensing tube

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35

Installation
Figure 49. DAS tubing after conversion to horizontal

Figure 51. DAS tubing factory installation for downflow

Vertical slide bracket new position
90 degree elbow installation location Pickup tube – new poisition
Figure 50. DAS tubing after conversion to horizontal detail

Vertical hole(s) available for horizontal
Vertical slide bracket new position

Figure 52. DAS tubing after conversion to horizontal

Conversion to Horizontal — Model YSJ072***BL
Note: An elbow is not required for this conversion.
1. Remove vertical slide bracket screw.
2. Slide the vertical slide bracket down to expose the holes in the vertical tube. See and Figure 52, p. 36, and Figure 53, p. 37.
3. Reattach bracket screw to secure vertical slide bracket in new position.

36

RT-SVX071D-EN

Installation

Figure 53. Detail view of DAS tubing after converting to horizontal
Slide bracket down to open hole in vertical tube Vertical slide bracket new position
TCO1 Instructions
Note: For complete Gas Heat User information, Operation, Start-up, Shutdown and Maintenance refer to “Gas Heat Operation and Maintenance,” p. 68.
Figure 54. TCO1 instructions

If the unit being installed has a different TCO1 value than listed in , the limit control TCO1 must be replaced with the extra limit control shipped in the heater compartment. Replace TCO1 following the instructions in steps 1 through 3 below. If the unit being installed does not need to replace TCO1 limit switch, skip steps 1 through 3 and proceed to the next step in the installation process.
1. Remove the heat section access panel.
2. Remove TCO1 from shipping location, which is either attached to the combustion blower motor (6 to 12.5 tons) or to the installed TCO1 limit switch (15 to 25 tons).
3. Replace and discard the existing TCO1 originally installed at the factory for down flow operation with the TCO1 shipped which is either attached to the combustion blower motor (6 to 12.5 tons) or to the installed TCO1 limit switch (15 to 25 tons) for horizontal operation.
4. Replace heat section access panel.

Location of TCO1 limit to be installed
6 to 12.5 Ton Units ­ two-stage gas
Note: The TCO1 switch is attached by two screws in the location shown. The switch has short legs on it so use caution when sliding out of vestibule face during removal.
Return Air Smoke Detector
The factory installed return air smoke detector is installed in the downflow discharge position for 15 to 25 ton units. No additional field setup is required. If a unit is to be converted to horizontal discharge, for 15 to 25 ton units, the following conversion must be performed. 1. If the unit has an economizer, it must be pulled out in
RT-SVX071D-EN

Additional TCO1 limit switch to be used for horizontal discharge field conversion
Location of TCO1 limit to be installed 15 to 25 Ton Units ­ two-stage gas
the operating position. 2. Remove the two screws from the mounting brackets.
Note: Refer to downflow view for screw locations of 15 to 25 ton units.
37

Installation
Figure 55. Downflow bracket installation (view from horizontal return duct)

viewed from outside unit facing horizontal supply). See Figure 57, p. 38.
Figure 57. Horizontal bracket installation (view from horizontal return duct)

3. Lift the tube and bracket from the downflow duct opening. Rotate the tube and bracket assembly 90 degrees and confirm the holes on the aluminium sensing tube face away from the unit and face the return air ductwork. Note: Refer to horizontal views below of the 15 to 25 ton units.
Figure 56. Horizontal bracket installation (top view of unit)

5. Use the remaining two screws and bracket removed in step 2, secure the bottom bracket.
Air-Fi® Wireless Communication Interface
The factory installed wireless communications interface is installed in the downflow discharge position.
If converting to horizontal discharge, perform the following:
1. If the unit has an economizer, it must be pulled out in the operating position.
2. Remove the screw from the mounting bracket. Refer to downflow view for screw and bracket location.
Figure 58. Wireless communication interface dowflow

Note: Flexible tubing should lay flat on the base pan surface.
4. Slide the top bracket down the aluminium sensing tube. · For 15 to 25 ton units with standard or low leak economizers, secure the tube to the top right side of the horizontal opening flange (right side when
38

3. Mount the bracket in the horizontal discharge location. Refer to horizontal view for screw and bracket location.
RT-SVX071D-EN

Installation

Figure 59. Wireless communication interface horizontal
Note: Cable ties must be removed to allow the cable to extend to the horizontal mounting location.
Main Electrical Power Requirements
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.
1. Verify that the power supply complies with the unit nameplate specifications.
2. Inspect all control panel components and tighten any loose connections.
RT-SVX071D-EN

3. Connect properly sized and protected power supply wiring to a field- supplied/installed disconnect switch and to the main power terminal block (HTB1) in the unit control panel.
4. Install proper grounding wires to an earth ground.

Through-the-Base Gas Installation
Important: All phases of this installation must comply with national, state, and local codes. In absence of local codes, the installation must conform with American National Standard-Z223.1aNational Fuel Gas Code Latest Revision.
Note: For complete Gas Heat User information, Operation, Start-up, Shutdown and Maintenance refer to “Gas Heat Operation and Maintenance,” p. 68.
1. Remove the access panel for the heat section on the front of the unit for field connections.
2. The gas piping assembly ships inside this section and includes the shut- off valve, a pressure tap for testing, and the necessary unions for field connection. For through the base access, remove the factory-provided cap from the base pan opening. See Figure 60, p. 39 and Figure 61, p. 40.
3. Route field piping through this hole to the dimension shown in Table 5, p. 39.
4. Place the assembly through the cabinet opening shown in Figure 61, p. 40 and Figure 62, p. 40, and make the union connection to the field piping and to the gas train.
Table 5. Through-the-base gas piping dimension

Model YSJ(072-150)***(0,A) (L, M, H)

Dimension A (inch) 4 5/8

YSJ(180-300)***(0,A)(L, M, H)

1 3/16

Figure 60. Through-the-base gas pipe height Customer Gas Supply Pipe

A

Grommet

DETAIL A

39

Installation

Figure 61. Through-the-base gas pipe assembly for YSJ(180-300)*

N

A

O

L

M

D

K

J I

G H

E

F

B
See Detail A
C

Component A B C D E F G H I J K L M N O

Description Grommet Grommet
Pipe Fitting (3/4-in. x 8 1/2-in.) 90° Elbow
Support Plate Tee
Pipe Fitting (3/4-in. x 4-in.) Cap
Pipe Fitting (3/4-in. x 2 1/2-in.) 90° Street Elbow Pipe Union
Pipe Fitting (3/4-in. x 2 1/2-in.) Gas Shut-off Valve 90° Street Elbow
Pipe Fitting (3/4-in. x 6 1/2-in.)

40

Figure 62. Through-the-base gas pipe assemblies for YSJ(072-150)*
C DA

E B

F

A

M

G

LK

H

I

J
1/2-in. and 3/4-in., Gas Pipe Connection

Table 6. Through-the-base gas pipe assembly components for YSJ(072-150)* (inch)

Component Description

A

Grommets

B

TBUG bracket

C

90° Elbow

D

Pipe fitting

E

Gas ball valve

F

Street elbow

G

Pipe fitting

H

Tee pipe

I

Pipe fitting

J

Pipe cap

K

Pipe fitting

L

Pipe union

M

Pipe fitting

Connection Size

1/2 inch

3/4 inch

½

¾

–

–

½

¾

½ x 7¼

¾ x 6½

½

¾

½

¾

½x2½

¾ x 2¼

½

¾

½x4

¾x4

½

¾

½x2¾

¾x2

½

¾

½x4½

¾ x 5¼

Note: All modulating gas models use 3/4-inch gas piping.

For detailed through-the-base gas installation instructions, refer to the Through-the-Base Gas Piping 3 to 25 Tons Gas/Electric Packaged Units Installation Instructions (ACCSVN17*-EN) provided with through-the-base gas installation kit.

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Installation

Requirements of Gas Heat
The unit gas train and optional through-the-base gas shutoff valve are rated at 0.50 PSIG maximum. A pressure reducing regulator is recommended to prevent this maximum from being exceeded. These components must be isolated during field gas piping test that exceed 0.50 PSIG. Important: It is recommended that the field piping be
capped prior to the unit gas train or optional through-the-base gas shut-off valve if present.
Gas supply line properly sized and connected to the unit gas train.
All gas piping joints properly sealed.
Gas piping leak checked with a soap solution. If piping connections to the unit are complete, do not pressurize piping in excess of 0.50 PSIG or 14-inch w.c. to prevent component failure.
Drip leg installed in the gas piping near the unit.
Flue exhaust clear of any obstruction.
Supply and manifold pressures should be checked during unit commissioning (see Table 7, p. 41 and Table 8, p. 41).
Table 7. Gas heat data – supply and manifold pressure requirements ­ two-stage gas

YSJ(072-150)*

YSJ(180-300)*

Heating Input Rate ­ Btu/h
Minimum Supply Gas Pressure NG/LP (in. w.c.)
Maximum Supply Gas Pressure (in. w.c.)
Manifold Gas Pressure ­ 1st Stage – NG (in. w.c.)
Manifold Gas Pressure ­ 2nd Stage – NG (in. w.c.)

80,000 ­ 250,000 250,000 320,000 400,000

4.5/11.5

4.5/11.5

6/11.5

14

1.8

1.7

1.8

1.7

3.5

3.3

3.5

3.3

Table 8. Gas heat data – supply and manifold pressure requirements – modulating gas
Digit 10 = B models

Heating Input Rate ­ Btu/h

80,000 ­ 400,000

Minimum Supply Gas Pressure NG/LP (in. w.c.)
Maximum Supply Gas Pressure (in. w.c.) Manifold Gas Pressure ­ Full Gas Input Rate – NG/ LP (in. w.c.)

5/11.5 14
3.5/10

Modulating Gas Heat
For models YSJ(072,090,102,120,150)***B(H,L):
1. Confirm the vertical slide bracket on the DAS vertical tube is positioned to block all the hole(s) for downflow configuration.

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Note: Number of holes will vary. Verify bracket is covering all holes in the vertical tube, regardless of quantity.
2. Removal of horizontal duct supply cover is required to view DAS tubing located behind the heat exchanger tubes.
Figure 63. Downflow position shown
Vertical slide bracket downflow position
Bracket adjustment screw
Figure 64. Vertical tube hole(s) location
Vertical DAS tube
Vertical slide bracket positioned to block hole(s)
Hole or holes located here
Condensate Drain Configuration WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter. An evaporator condensate drain connection is provided on each unit. Refer to the ductwork section in the Installation chapter for the appropriate drain location.
41

Installation

The 6 to 12.5 tons condensate drain pan is convertible. Refer to the ductwork section drawings in the Installation chapter. It can be converted to drain condensate from the front side of the unit or through the base.
To convert drain condensate out the front of unit:
1. Remove evaporator access panel and supply air access panels.
2. Remove the support panel that the condensate drain pan exits through.
3. Slide the condensate drain pan out of the unit and rotate 180°.
4. Slide the condensate drain pan back into the unit. Align the drain with the grommeted opening in the rear support panel and push until the coupling is seated in the grommet.
5. Replace the front support panel by aligning the panel with tabs in the raceway. Align the condensate drain pan support in the grommeted hole as the panel is put in place.
6. Replace evaporator access panel and supply air access panels.
To convert drain condensate through the base of unit:
1. Remove evaporator access panel and supply air access panels.
2. Remove the support panel that the condensate drain pan exits through.
3. Slide the condensate drain pan out of the unit.
4. Place on a level surface in the position it was removed from the unit.
5. Remove the plug knockout in the bottom of the drainpan to convert it to through the base drainage.
6. Plug the original condensate drain opening with a field supplied 3/4-inch NPT plug.
7. Slide the condensate drain pan back into the unit. Align the drain support with the grommeted opening in the rear support panel and push until the support is seated in the grommet.
8. Replace the front support panel by aligning the panel with tabs in the raceway. Align the plugged condensate drain pan coupling in the grommeted hole as the panel is put in place.
9. Replace evaporator access panel and supply air access panels.
A condensate trap must be installed at the unit due to the drain connection being on the negative pressure side of the fan. Install the p-trap using the guidelines in .
A condensate drain line must be connected to the p-trap. Pitch the drain lines at least 1/2-inch for every 10 feet of horizontal run to assure proper condensate flow. Do not allow the horizontal run to sag causing a possible double trap condition. This can result in condensate backup due to air lock.
42

Figure 65. Condensate trap installation

CABINET A/B/C D

Drain Pan Type Connection

STD

STAINLESS

3/4″ NPT

3/4″ NPT

1″ PVC Socket

1″ NPT

FIELD SUPPLIED PIPING

UNIT POST

1.5″ MIN. (381 MM) 4″+ REQUIRED FOR HIGHER STATICS

CLEANOUT PLUG

Drain Pan Removal (Units with Condensate Overflow Switch Option)
Before drain pan removal, the switch wire must be disconnected from wire tie on panel and/or any tape before drain pan can be removed.
Avoid catching the wire on the bottom of indoor coil or any protrusion. Note: When reversing the drain pan on some units, the
condensate overflow switch will need to be moved to the second hole in its bracket to avoid contact with headers or indoor coil.
Furnace Condensate Drain
Modulating gas units are equipped with a furnace condensate drain system to evacuate any condensation (water) that may form inside the heat exchanger during cooling system operation. The unit does not condense during heating operation. Neutralization is not necessary as the condensate drainage is water only and is not acidic.
Filter Installation
The quantity of filters is determined by unit size. Access to the filters is obtained by removing the filter access panel. Note: Do not operate the unit without filters.

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Installation

Field Installed Power Wiring
WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.
An overall dimensional layout for the field installed wiring entrance into the unit is illustrated in the Dimensions and Weights chapter. See the following guidelines to confirm the unit supply power wiring is properly sized and installed.
Verify the power supply available is compatible with unit nameplate ratings. The available supply power must be within 10 percent of the rated voltage stamped on the nameplate. Use only copper conductors to connect the power supply to the unit.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in equipment damage as the equipment was not designed or qualified to accept other types of conductors.
Important: If the unit is not equipped with an optional factory installed non- fused disconnect switch or circuit breaker, a field supplied disconnect switch must be installed at or near the unit in accordance with the National Electrical Code (NEC latest edition).
Main Unit Power
WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.

WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury.
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.

Standard Wiring

1. Location of the applicable electrical service entrance is illustrated in the Dimensions and Weights chapter. Complete the unit power wiring connections at HTB1 main power terminal block in unit control panel. Refer to the customer connection diagram shipped with the unit for specific termination points.
2. Provide proper grounding for the unit in accordance with local and national codes.

Optional TBUE Wiring (Through-theBase Electrical Option)

· Location of the applicable electrical service is illustrated below. Refer to the customer connection diagram shipped with the unit for specific termination points. The termination points, depending on the customer option selected, would be a factory mounted non-fused disconnect switch (UDC) or circuit breaker (UCB). If neither a factory mounted non-fused disconnect switch (UDC) or circuit breaker (UCB) was factory mounted, field wiring connections should be terminated in the control box at main panel power terminal block (HTB1).

· Provide proper grounding for the unit in accordance with local and national codes.

Notes: ·
·

Black gasket is shipped from the factory and is located in the literature ship-with bag in the control box. Apply black gasket around conduit plate on all four sides after installation to prevent air leakage from the building entering the electrical enclosures. Seal any unused unit penetrations and around conduit and wiring at all unit and curb penetrations.

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43

Installation
Field-Installed Control Wiring
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.
WARNING
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.
An overall layout of the various control options available with the required number of conductors for each control device is illustrated in the wiring diagram located on main control box door.
All field wiring must conform to NEC guidelines as well as state and local codes.
Control Power Transformer
The 24 volt control power transformers are to be used only with the accessories called out in this manual. Transformers rated greater than 50 VA are equipped with internal circuit breakers. If a circuit breaker trips, turn OFF all power to the unit before attempting to reset it.

WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.
The transformers are located in the control panel. The circuit breaker is located on the right side of the transformer and can be reset by pressing in on the black reset button.
Controls using 24 Vac
Before installing any connecting wiring, refer to the Dimensions and Weights chapter for the electrical access locations provided on the unit and Table 9, p. 46 for AC conductor sizing guidelines, and;
1. Use copper conductors unless otherwise specified.
2. AC control wiring between the controls and the unit termination point should not exceed 2.5 ohms/ conductor for the length of the run.
NOTICE
Component Failure!
Resistance in excess of two and a half (2.5) ohms per conductor could result in component failure due to insufficient AC voltage supply. Do not exceed two and a half (2.5) ohms per conductor for the length of the run.
Note: Check all loads and conductors for grounds, shorts, and mis-wiring.
3. Do not run the AC low voltage wiring in the same conduit with the high voltage power wiring.
4. Route low voltage wiring per illustrations below.
These illustrations are representative as some models may appear slightly different. The low voltage wiring routing is the same.

44

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Figure 66. Low voltage wiring — B cabinet

Installation

Figure 67. Low voltage wiring — C cabinet

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45

Installation
Figure 68. Low voltage wiring — D cabinet

Figure 69. Main control panel low voltage wiring

Table 9. Recommended wire lengths

Wire Size

AWG

mm2

Maximum recommended wire length from unit controller to
sensor

Meters

Feet

22

0.33

0­46

0­150

20

0.50

47­73

151­240

18

0.75

74­117

241­385

16

1.30

118­185

386­610

14

2.00

186­296

611­970

Note: The total resistance of these low voltage wires must not exceed 2.5 /conductor. Any resistance greater than 2.5 may cause the control to malfunction due to an excessive voltage drop.

Controls using DC Analog Input/Outputs (Standard Low Voltage Multi conductor Wire)
Before installing any connecting wiring between the unit and components utilizing a DC analog inputoutput signal, refer to the Dimensions and Weights chapter for the electrical access locations provided on the unit.
· Table 10, p. 47 lists the conductor sizing guidelines that must be followed when interconnecting the DC binary output devices and the system components utilizing a DC analog input/output signal to the unit.

46

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Installation

Notes: ­
­

Resistance in excess of 2.5 ohms per conductor can cause deviations in the accuracy of the controls. Confirm the wiring between controls and the unit termination point does not exceed two and a half (2.5) ohms/conductor for the length of the run.

· Do not run the electrical wires transporting DC signals in or around conduit housing high voltage wires.

DC Conductors
Table 10. Zone sensor module wiring

Distance from Unit to Control 0 – 150 feet 0 – 45.7 m
151 – 240 feet 46 – 73.1 m 241 -385 feet
73.5 – 117.3 m 386 – 610 feet 117.7 – 185.9 m

Recommended Wire Size 22 gauge 0.33 mm2 20 gauge 0.50 mm2 18 gauge 0.75 mm2 16 gauge 1.3 mm2

Table 10. Zone sensor module wiring (continued)

Distance from Unit to Control 611 – 970 feet 186.2 – 295.7 m

Recommended Wire Size 14 gauge 0.2 mm2

Note: See SymbioTM 700 unit controls schematic, 12134349, for controls wiring.

Space Temperature Averaging
Space temperature averaging is accomplished by wiring a number of remote sensors in a series/parallel circuit.
When using the BAYSENS016 or BAYSENS077, at least four sensors are required to accomplish space temperature averaging.
· Example #1 illustrates two series circuits with two sensors in each circuit wired in parallel. The square of any number of remote sensors is required.
· Example #2 illustrates three sensors squared in a series/parallel circuit. Using BAYSENS077*, two sensors are required to accomplish space temperature averaging.
· Example #3 illustrates the circuit required for this sensor. lists the temperature versus resistance coefficient for all sensors.

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47

Installation
Figure 70. Examples

Note: Wiring pin numbers are for reference only. There are multiple smoke detector systems that could have differently numbered pins. For correct wiring details, refer to the specific smoke detector, ship-with literature.
Table 11. Temperature vs. resistance

Temperature

Degrees °F

Degrees °C

Nominal Resistance (kOhms)

-20

-28.9

-15

-26.1

-10

-23.3

-5

-20.6

0

-17.8

170.1 143.5 121.4 103.0 87.56

48

Table 11. Temperature vs. resistance (continued)

Temperature

Degrees °F

Degrees °C

Nominal Resistance (kOhms)

5

-15.0

10

-12.2

15

-9.4

20

-6.7

25

-3.8

30

-1.1

35

1.7

40°

4.4

45°

7.2

74.65 63.80 54.66 46.94 40.40 34.85 30.18 26.22 22.85

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Installation

Table 11. Temperature vs. resistance (continued)

Temperature

Degrees °F

Degrees °C

Nominal Resistance (kOhms)

50°

10.0

55°

12.8

60°

15.6

65°

18.3

70°

21.1

75°

23.9

80°

26.7

85°

29.4

90°

32.2

95°

35.0

19.96 17.47 15.33 13.4 11.89 10.50 9.297 8.247 7.330 6.528

Table 12. Sizing natural gas pipe mains and branches

Length of Pipe
(Ft.)

1/2-in. Pipe

Iron Pipe Size (IPS) Inches

3/4-in. Pipe

1-in. Pipe

1¼-in. Pipe

1½-in. Pipe

15

76

176

345

750

1220

30

52

120

241

535

850

45

43

99

199

435

700

60

38

86

173

380

610

75

–

77

155

345

545

Note: Capacity of pipe of different diameters and lengths in Cu. Meter per Hr. with pressure drop of 74.6 Pa and specific gravity of 0.60.

Table 13. Iron pipe size (SI) millimeters

Iron Pipe Size (SI) Millimeters

Length of Pipe
(Meters)

15 mm Pipe

20 mm Pipe

25 mm Pipe

32 mm Pipe

40 mm Pipe

4.6

2.15

4.98

9.76

21.23

34.54

9.1

1.47

3.39

6.82

15.14

24.06

13.7

1.21

2.80

5.63

12.31

19.82

18.3

1.07

2.43

4.89

10.76

17.27

22.9

—

2.18

4.38

9.76

15.40

Note: Capacity of pipe of different diameters and lengths in Cu. Meter per Hr. with pressure drop of 74.6 Pa and specific gravity of 0.60.

Figure 71. Schematic diagram for field gas piping to Units

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49

Pre-Start
Use the checklist provided below in conjunction with the General Unit Requirements checklist to confirm the unit is properly installed and ready for operation.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
· Check all electrical connections for tightness and point of termination accuracy.
· Verify that the condenser airflow will be unobstructed.
WARNING
Rotating Components!
Failure to disconnect power before servicing could result in rotating components cutting and slashing technician which could result in death or serious injury. During installation, testing, servicing and troubleshooting of this product it may be necessary to work with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks.
· Verify that the condenser fan and indoor blower turn freely without rubbing and are properly tightened on the shafts.
· Verify that a condensate trap is installed and the piping is properly sized and pitched.
· Verify that the correct size and number of filters are in place.
· Inspect the interior of the unit for tools and debris and install all panels in preparation for starting the unit.
Voltage Imbalance
Three phase electrical power to the unit must meet stringent requirements for the unit to operate properly.
1. Measure each leg (phase-to-phase) of the power supply. Each reading must fall within the utilization range stamped on the unit nameplate. If any of the readings do not fall within the proper tolerances, notify the power company to correct this situation before operating the unit.
50

Excessive three phase voltage imbalance between phases will cause motors to overheat and eventually fail. The maximum allowable voltage imbalance is 2 percent.

2. Measure and record the voltage between phases 1, 2, and 3 and calculate the amount of imbalance as follows:

100 x AV – VD

% Voltage Imbalance =

where;

AV

Volt1 + Volt2 + Volt3 AV (Average Voltage) =
3

· V1, V2, V3 = Line Voltage Readings
· VD = Line Voltage reading that deviates the farthest from the average voltage.
Example: If the voltage readings of the supply power measured 221, 230, and 227, the average volts would be:
221 + 230 + 221 = 226 Avg.
3

VD (reading farthest from average) = 221 The percentage of Imbalance equals: 100 + 226 + 221
= 2.2% 226

The 2.2 percent imbalance in this example exceeds the maximum allowable imbalance of 2.0 percent. This much imbalance between phases can equal as much as a 20 percent current imbalance with a resulting increase in motor winding temperatures that will decrease motor life.
3. If the voltage imbalance is over 2 percent, notify the proper agencies to correct the voltage problem before operating this equipment.
Electrical Phasing (Three Phase Motors)
The compressor motor(s) and the supply fan motor are internally connected for the proper rotation when the incoming power supply is phased as A, B, C.
Proper electrical supply phasing can be quickly determined and corrected before starting the unit by using an instrument such as an Associated Research Model 45 Phase Sequence Indicator and following the steps below.

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Pre-Start

WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.
1. Turn the field supplied disconnect switch that provides power to the main power terminal block or to the line side of the optional factory mounted disconnect switch OFF.
2. Connect the phase sequence indicator leads to the terminal block or to the line side of the optional factory mounted disconnect switch as follows:
a. Brown (phase A) to L1
b. Orange (phase B) to L2
c. Yellow (phase C) to L3
3. Close the field supplied main power disconnect switch or circuit protector switch that provides the supply power to the unit. Note: Upon closing main power disconnect and the unit mounted disconnect switch or circuit breaker, the phase monitor will verify proper phasing. If LED on face of the monitor is red, correct supply power fault.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
Important: To prevent injury or death from electrocution, it is the responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.
4. Observe the ABC and CBA phase indicator lights on the face of the sequencer. The ABC indicator light will glow if the phase is ABC. If the CBA indicator light glows, open the disconnect switch or circuit protection switch and reverse any two power wires.
5. Restore the main electrical power and recheck the phasing. If the phasing is correct, open the disconnect
RT-SVX071D-EN

switch or circuit protection switch and remove the phase sequence indicator.
Compressor Crankcase Heaters
· Each compressor can be equipped with a crankcase heater (Some units include crankcase heater as standard). The proper operation of the crankcase heater is important to maintain an elevated compressor oil temperature during the off cycle to reduce oil foaming during compressor starts.
· Oil foaming occurs when refrigerant condenses in the compressor and mixes with the oil. In lower ambient conditions, refrigerant migration to the compressor could increase.
· When the compressor starts, the sudden reduction in crankcase pressure causes the liquid refrigerant to boil rapidly causing the oil to foam. This condition could damage compressor bearings due to reduced lubrication and could cause compressor mechanical failures.
1. Before starting the unit in the cooling mode, flip the system switch OFF.
2. Turn the main power disconnect ON and allow the crankcase heater to operate a minimum of 8 hours.
1. Before closing the main power disconnect switch, confirm the system selection switch is OFF and the fan selection switch is in the AUTO position. 2.
2. Close the main power disconnect switch and the unit mounted disconnect switch, if applicable.
Note: When closing main power disconnect and the unit mounted disconnect switch or circuit breaker, the phase monitor will verify proper phasing. If LED on face of the monitor is red, correct supply power fault.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
Important: To prevent injury or death from electrocution, it is the responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.
Symbio Controls
The SymbioTM 700 supports a Service Test Mode that can be used to energize the various components of the system, either to support general system startup tasks or to support
51

Pre-Start

troubleshooting. The user can initiate Service Test Mode through the controller user interfaces, including the Symbio Service and Installation mobile application.
The modes shown below can be initiated. Depending on the equipment configuration, the controller will energize the appropriate outputs. A user- selected timeout value will
Figure 72. Symbio 700 service test mode

determine how long the controller will remain in any given state once initiated. For detailed information on how each Service Test State is interpreted based on the equipment configuration, see ACC-APG002*-EN, SymbioTM 700 for Precedent Packaged Rooftop Air-Conditioners Application Guide.

52

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Unit Start-Up

Sequence of Operation
See ACC-APG002*-EN, Application Guide, SymbioTM 700 Controller with PrecedentTM Packaged Rooftop AirConditioners.

Ignition Module ­ Two-stage
Two-stage (IGN) runs self-check (including verification that the gas valve is de-energized). (IGN) checks the high limit switches (TC01 and TC02) for normally closed contacts, the pressure switch (PS) for normally open contacts, and the flame rollout (FR) switch for continuity.
(IGN) energizes inducer blower on high speed to check pressure switch closure. If the pressure switch is closed, the inducer blower starts a 20 second pre- purge (15 seconds on high speed followed by 5 seconds on low speed). If the pressure switch (PS) is still open, the inducer blower will continue to be energized on high speed until pressure switch closure.
After pre-purge completes, the IGN energizes the first stage gas output for first stage heat demand and energizes second stage gas output for second stage heat and detects flame and de-energizes spark.
At this point indoor fan would start with its minimum speed for the corresponding heat (first stage or second stage) demand.
The (IGN) enters a normal operating loop where all inputs are continuously monitored.
If a call for second stage heat is initiated after a call for first stage heat is established, the (IGN) energizes the second stage of the gas valve and the second stage of inducer blower.
When the zone thermostat is satisfied, the (IGN) deenergizes the gas valve. The (IGN) senses loss of flame.
The (IGN) initiates a 5 second inducer blower post purge. The SymbioTM 700 initiates a 90 second indoor blower-off delay at the current speed. The (IGN) de-energizes the inducer blower at the end of the post purge. The Symbio 700 de-energizes the indoor blower at the end of the selected indoor blower-off delay
Note: For complete Gas Heat User information, Operation, Start-up, Shutdown and Maintenance refer to “Gas Heat Operation and Maintenance,” p. 68.

Table 14. Ignition module diagnostics

Steady OFF

No Power/Failure/ Internal Failure

Steady ON Slow Flash Rate

Normal ­ No Call for heat
Normal, call for heat (¾ second on, ¼ second off)

1 Flash

Loss of Communication

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Table 14. Ignition module diagnostics (continued)

2 Flashes

System Lockout: Failed to detect or sustain flame. (failure to ignite, no spark, low/no gas pressure, etc.)

3 Flashes

Pressure switch problem detected. (no vent air flow, bad CBM, closed at initial call for heat). Auto reset.

4 Flashes

High Limit switch protection device open (excessive heat in combustion chamber, low airflow). Auto reset.

5 Flashes
6 Flashes
7 Flashes 8 Flashes 9 Flashes

Flame sensed and gas valve not energized, or flame sensed and no call for heat.
Flame Rollout Switch open. (CBM failure, incorrect gas pressure, incorrect primary air). Requires manual reset of the switch.
Weak Flame
Internal Error
Hardware Mismatch

Ignition Module ­ Modulating Gas
Call for Heat
1. Thermostat (or heat enable) contact closes providing call for heat.
2. The provided analog input is 2.0 Vdc (0.5% ModBus firing rate) or higher, the modulating actuator is placed in the park position and the draft inducer is energized, the air pressure transducer is calibrated, and the draft inducer is run to the pre-purge setting. A 15 to 30 second pre-purge is initiated. The display on the VB1285 will show pur. See below.
3. The modulating actuator is moved to the ignition position during this time.
4. At the end of the pre-purge period, the ignition source is activated, and the main gas valve opens allowing gas to flow to the burners for the trial for ignition period [Ign].
5. Burners ignite and cross light. Flame is sensed and control continues the heating cycle.
6. Control enters a Warm-up period [HEA] that allows for burner stabilization prior to active modulation. Warm-up duration is program controlled.
7. At the end of the warm-up period, the 1st stage enters the run state characterized by normal burner modulation in response to the 2-6 Vdc analog input (1 56% ModBus firing rate) signal to the control [run].
8. The modulating gas valve is set as commanded by the analog FIRING RATE input signal:

53

Unit Start-Up

a. < 1.5 Vdc (0% ModBus Firing Rate)]: OFF
b. 1.5 ­ 2.0 Vdc (0.5% ModBus Firing Rate): Minimum fire (Manifold pressure .20 to.30 in. w.c.)
c. 2.1 ­ 6.0 Vdc (1 – 56% ModBus Firing Rate): Modulation linearized to firing rate (Modulating Section Manifold pressure .25 to 3.50 in. w.c.)
9. If heating demand continues to increase and the analog input signal exceeds 6.0 Vdc (56% ModBus firing rate), and provided the air pressure switch is closed, the VB1285 initiates a trial for ignition of the 2nd stage.
10. Burners ignite and cross light. Flame is sensed and control continues the heating cycle.
11. Once the 2nd stage operation is verified, the 1st stage modulation is reset to its minimum input rate.
12. The modulating gas valve is set as commanded by the analog FIRING RATE input signal and will modulate between 6.1 and 10.0 Vdc analog input (57 – 100% ModBus firing rate), while maintaining operation of the 2nd stage at 3.50­inches w.c. manifold pressure.
13. The control remains in the high fire mode as long as the firing rate signal is above 5.0 Vdc (46% ModBus firing rate).
14. If the firing rate signal drops below 5.0 Vdc (46% ModBus firing rate), the 2nd stage section will shut-off and the 1st stage will continue to operate and modulate in response to changes in analog signal voltage.
15. System will continue in the run state until the heat enable contacts open or the analog input signal drops below 1.5 Vdc (0.5% ModBus firing rate) signal.
16. When call for heat is removed, 1st stage gas valve closes and modulating actuator is moved to Park position, and the inducer is operated for a post purge period of 60 seconds [Pur].
17. Control returns to the standby mode [Off].
Ignition and Operational Failures During a Call for Heat
1. If flame is not detected on the original ignition trial

[A01], the controller enters an inter-purge period of 30 seconds [rEt] and then will initiate another ignition trial. The control will repeat this sequence for up to 4 ignition trials.
2. If four consecutive failed ignition trials occur, control will go into lockout [E01].
3. If flame is lost during an operating cycle [A02], the controller will operate same as in Step 1.
4. Limited low fire [A04] will happen if flame loss at low fire results in an auto-adjustment that limits the burner turn down during the rest of the current call for heat.
5. Lockout will also occur for the following:
a. Open Limit or Rollout Switch [E02].
b. Low air pressure sensor reading is air pressure does not correspond to gas pressure [E04].
c. No R-W Enable [E09].
6. If the combustion air pressure switch opens (blocked vent or other airflow restriction) during heater operation with a continued call for heat, the control will lockout for one hour and then initiate a trial for ignition sequence.
7. Lockout will occur for any lockout error on either control and terminate heater operation for the duration of the lockout timing.
8. If no call for heat is present, controller is in the Off mode [OFF].
Recovery from Lockout (E Code)
1. If the call for heat (thermostat or heat enable closed) is still present one hour after a lockout occurs, the control will automatically reset and initiate a call for heat sequence.
2. Control may also be reset manually by removing power to the controller for 10 seconds and restoring power to controller.

Display Code 888 OFF Pur I6n HEA run rEt
A01 A02

Code Type 10s L/O Status Status Status Status Status Status
Alert Alert

Description Board Failure (Up to 10 seconds at power up)
UP Mode: Burner state = Off UP Mode: Burner state = Purge UP Mode: Burner state = Ignition UP Mode: Burner state = Warm up UP Mode: Burner state = Run UP Mode: Burner state = Retry (with A01 or A02)
Failed ignition attempt Lost Flame

Additional Comments and Notes Verify 24 Vac signal input at connector J6.
Retry delay following either a failed ignition or a flame loss. Ignition was successful but then flame disappeared.

54

RT-SVX071D-EN

Unit Start-Up

Display Code A03 A04
A05 A07 A08 A11 A15 E01 E02 E03 E04
E05 E08 E09
E11 E13 E18 Eid

Code Type Alert Alert
Alert Alert Alert Alert Alert 1hr L/O 10s L/O 10s L/O 30s L/O
30s L/O 10s L/O 0s L/O
10s L/O 10s L/O 10s L/O 10s L/O

Description Insufficient Combustion Air Limited Low Fire (due to Lost Flame Auto-Adaptation)
Weak Flame Signal Loss of Inducer Motor Control Air Sensor Null Pressure Check out-of-tolerance Failed Ignition — split manifold burner Weak Flame Signal — split manifold
Failed Ignition Primary Limit Failure Modulation Valve Failure Air Sensor Failure — Pressure Reading Low
Air Sensor Failure — Pressure Reading High Improper Flame No R-W Enable
1287 Lockout (L/O) Open fuse
1287 Improper Flame Invalid I.D. Plug Installed

Additional Comments and Notes
Blocked vent with actuator position derated by >20% from FRI setting
Flame loss at low fire results in an auto-adjustment that limits the burner turn down during the rest of the current call for heat.
Flame presence signal of less than 1.5µA indicates an aged flame rod.
Air pressure is not modulating down at minimum inducer drive.
Air pressure sensor zero reading appears to be out-oftolerance.
Failed Ignition, Split manifold burner, retries exhausted.
Weak Flame Signal, one or more split-manifold staged burners.
Four failed ignition attempts have occurred.
Verify Primary Limit input at connector J8 and fuse at F1.
Valve Actuator did not reach a Park or Full On position.
Includes insufficient air lockout due to blocked vent. Includes air switch failure to open during pre-purge switch check.
Includes air switch failure to close during pre-purge switch check.
An R-W open circuit is preventing the control from operating on a non-zero Firing Rate Demand or Firing Rate Input.
1287 L/O causes a 1285 L/O. Check 1287 control board LED state per the 1287 LED key below.
Unexpected flame, Split manifold burner.

Return Air Smoke Detector
The return air smoke detector is designed to shut off the unit if smoke is sensed in the return air stream. Sampling the airflow entering the unit at the return air opening performs this function.
In order for the smoke detector to properly sense smoke in the return air stream, the air velocity entering the unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will develop an airflow velocity that falls within these limits over the entire airflow range specified in the evaporator fan performance tables.

Compressor Start-Up
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
1. Attach a set of service gauges on the suction and discharge gauge ports for each circuit.
Proceed to the next Service Test step if continuing from previous component start-up or until the desired startup component test is started.

RT-SVX071D-EN

55

Unit Start-Up

2. After the compressor and condenser fan have started and operated for approximately 30 minutes, observe the operating pressures. Compare the operating pressures to the label on the access panel.
3. Check system superheat. Follow the instruction listed on the superheat charging curve. Superheat should be within ±5ºF of the superheat chart value.
4. Repeat steps 1 through 4 for each refrigerant circuit.
5. To stop the SERVICE TEST, flip the main power disconnect switch OFF or proceed to the next component start-up procedure. Remove electromechanical test mode connections (if applicable).
Hot Gas Reheat
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. When it is necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks.
1. Set the unit to Service Test step Reheat.
2. Once the unit is in the reheat test mode, verify the three way valve has shifted to the reheat position and that the supply temperature rises 10ºF more than when in cooling mode stage 2.
3. Monitor the suction pressure for 15 minutes. The suction pressure should remain within 5 psi of normal cooling operation.
4. If the unit has a two speed outdoor fan and if the outdoor air temperature is below 70°F, verify that the OD fan is in low speed.
5. Clamp an amp meter around one of 1st stage heater power wires at the heater contactor.
6. Using the Service Test Guide in Figure 72, p. 52, continue the SERVICE TEST start-up procedure for each compressor circuit.
7. Select the next desired Service Test Mode if continuing from previous component start up or exit Service Test if complete.
Gas Heat Units
1. Open the main disconnect switch to shut the unit off and to reset the RTRM.

2. Follow the Test Guide in Figure 72, p. 52 to start the unit in the heating mode.
3. Momentarily jump across the Test 1 and Test 2 terminals on LTB1 one additional time if continuing from previous component start-up or until the desired startup component test is started.
Note: When starting the unit for the first time or servicing the heaters, start the heater with the main gas supply turned OFF.
4. Once the ignition system and components have been checked, open the main power disconnect switch to reset the unit.
Final System Setup
After completing all of the pre-start and start-up procedures outlined in the previous sections (i.e., operating the unit in each of its modes through all available stages of cooling and heating), perform these final checks before leaving the unit.
1. Program the Night Setback (NSB) panel (if applicable) for proper unoccupied operation. Refer to the programming instructions for the specific panel.
2. Verify that the Remote panel system selection switch, fan selection switch, and zone temperature settings for automatic operation are correct.
3. Inspect the unit for misplaced tools, hardware, and debris.
4. Verify all exterior panels including the control panel doors and condenser grilles are secured in place.
5. Close the main disconnect switch or circuit protector switch that provides the supply power to the unit’s terminal block or the unit mounted disconnect switch.
WARNING
Safety Alert!
Failure to follow instructions below could result in death or serious injury. In addition to the following tasks, you MUST:
· Follow all instructions in the unit’s Installation, Operation, and Maintenance manual, including warnings, cautions, and notices.
· Perform all required tasks in any applicable Service Alerts and Service Bulletins.
· Review and understand all information provided in Submittals and Design Specifications.

56

RT-SVX071D-EN

Maintenance
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious injury. Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks.
Monthly Maintenance
Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Verify that no power is present with a voltmeter.
Filters
Inspect the return air filters. Clean or replace them if necessary.
Return Air Smoke Detector Maintenance
Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters. To verify airflow through the unit is adequate for proper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.
Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.
RT-SVX071D-EN

Condensate Overflow Switch
During maintenance, the switch float (black ring) must be checked to confirm free movement up and down.
Cooling Season
Check the unit drain pans and condensate piping to ensure that there are no blockages.
Inspect the evaporator and condenser coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in Coil Cleaning later in this section.
Manually rotate the condenser fans to confirm free movement and check motor bearings for wear. Verify all of the fan mounting hardware is tight.
Inspect the F/A-R/A damper hinges and pins to verify all moving parts are securely mounted. Keep the blades clean.
Verify all damper linkages move freely and lubricate with white grease, if necessary.
Check supply fan motor bearings and repair or replace the motor as necessary.
Verify all wire terminal connections are tight.
Remove any corrosion present on the exterior surfaces of the unit and repaint these areas.
Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping connections, etc.)
Confirm that all retaining screws are reinstalled in the unit access panels once these checks are complete.
With the unit running, check and record the following:
­ ambient temperature
­ compressor suction and discharge pressures (each circuit)
­ superheat (each circuit)
Record this data on an operator’s maintenance log. See Table 16, p. 59. If the operating pressures indicate a refrigerant shortage, measure the system superheat. For guidelines, see “Compressor Start-Up,” p. 55. Important: Do not release refrigerant to the atmosphere! If
adding or removing refrigerant is required, the service technician must comply with all federal, state and local laws.
Heating Season
· Inspect the unit air filters. If necessary, clean or replace them.
· Check supply fan motor bearings and repair or replace the motor as necessary.
· Inspect both the main unit control panel and heat section control box for loose electrical components and
57

Maintenance

terminal connections, as well as damaged wire insulation. Make any necessary repairs. · Verify the electric heat system operates properly.
Coil Cleaning
Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by minimizing the following: · Compressor head pressure and amperage draw · Evaporator water carryover · Fan brake horsepower · Due to increase static pressure losses · Airflow reduction
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in death or serious injury. Coil cleaning agents can be either acidic or highly alkaline and can burn severely if contact with skin or eyes occurs. Handle chemical carefully and avoid contact with skin. ALWAYS wear Personal Protective Equipment (PPE) including goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer’s Materials Safety Data Sheet and follow all recommended safe handling practices.
At least once each year, or more often if the unit is located in a dirty environment, clean the condenser coils using the instructions below. Follow these instructions as closely as possible to avoid damaging the coils. Note: For units equipped with hail guards follow removal
procedure listed below.
Hail Guard Removal
1. Remove shipping screws (ones without washers). 2. Lift hail guards up so screws with washers go to top of
keyhole. 3. Remove hailguard by sliding washer head screw
through keyhole. · To clean refrigerant coils, use a soft brush and a
sprayer (either a garden pump-up type or a highpressure sprayer). · A high- quality detergent is also required; suggested brands include “SPREX A.C.”, “OAKITE 161”, “OAKITE 166” and “COILOX”. · If the detergent selected is strongly alkaline (ph value exceeds 8.5), add an inhibitor.
58

Microchannel (MCHE) Coils
NOTICE
Coil Damage!
Failure to follow instructions below could result in coil damage. DO NOT use any detergents with microchannel condenser coils. Use pressurized water or air ONLY, with pressure no greater than 600psi. For additional information regarding the proper microchannel coil cleaning procedure, refer to RTSVB83-EN
· Due to the soft material and thin walls of the MCHE coils, the traditional field maintenance method recommended for Round Tube Plate Fin (RTPF) coils does not apply to microchannel coils.
· Chemical cleaners are a risk factor to MCHE due to the material of the coil.
· The manufacturer does not recommend the use of chemical cleaners to clean microchannel coils. Using chemical cleaners could lead to warranty claims being further evaluated for validity and failure analysis.
The recommended cleaning method for microchannel condenser coils is pressurized water or air with a nonpinpoint nozzle and an ECU of at least 180 with pressure no greater than 600 psi. To minimize the risk of coil damage, approach the cleaning of the coil with the pressure washer aimed perpendicular to the face of the coil during cleaning. Note: For more details on microchannel coil cleaning,
please refer to bulletin RT-SVB83-EN.
Hail Guard Reinstallation
Reinstall hail guards by aligning the keyholes over the washer screw heads, and slide into place. If the installation requires seismic or special wind load compliance, reinstall shipping screws.
Hot Gas Reheat Additional Oil
NOTICE
Compressor Damage!
Use of incorrect refrigerant and oil could result in compressor damage and improper unit operation. Use only refrigerant and oil specified on the unit nameplate.
Additional refrigerant oil has been added in the factory for all hot gas reheat units. If major components (MCHE coil, valve assembly, etc.) are replaced or serviced, the following steps must be taken.
1. Measure the amount of oil removed during servicing.
2. When recharging the unit after servicing, replace the amount of oil removed, as measured in step 1. Verify oil added is the correct type.
RT-SVX071D-EN

Maintenance

3. For compressor replacements and/or additional questions, contact Technical Support.
Annual Maintenance
Clean and repaint any corroded surface. Table 15. Unit data log
Complete Unit Model Number

Final Process
For future reference, record the unit data below in the blanks provided.

Unit Serial Number
Wiring Diagram Numbers (from unit control panel)
Connections

Schematics

Table 16. Sample maintenance log

Date

Current Ambient Temp F/C

Compr. Oil
Level

– ok – low
– ok – low
– ok – low
– ok – low
– ok – low
– ok – low

Refrigerant Circuit #1

Suct. Press. Psig/
kPa

Disch. Press Psig/ kPa

Liquid Press Psig/ kPa

Superheat F/
C

Subcool F/C

Compr. Oil
Level
– ok – low
– ok – low
– ok – low
– ok – low
– ok – low
– ok – low

Refrigerant Circuit #2

Suct. Press. Psig/
kPa

Disch. Press Psig/ kPa

Liquid Press Psig/ kPa

Superheat F/
C

Subcool F/C

Note: Check and record the data requested above each month during the cooling season with the unit running.

RT-SVX071D-EN

59

Troubleshooting
Refer to the Application Guide SymbioTM 700 Controller with PrecedentTM Packaged Rooftop Air-Conditioners (ACC-APG002*-EN).

60

RT-SVX071D-EN

Wiring Diagrams

Note: Wiring diagrams can be accessed using e-Library by entering the diagram number in the literature order

Table 17. Wiring diagrams

Schematic Type

Controls

Voltage

Drawing Number

Main Unit

Symbio 700

All

12134333

Main Unit

Symbio 700

All

12134334

Main Unit

Symbio 700

All

12134335

Main Unit

Symbio 700

All

12134336

Main Unit

Symbio 700

All

12134337

Main Unit

Symbio 700

230V

12134338

Main Unit

Symbio 700 460V/575V

12134339

Main Unit

Symbio 700

All

12134340

Main Unit

Symbio 700

230V

12134341

Main Unit

Symbio 700 460V/575V

12134342

Main Unit

Symbio 700

All

12134343

Main Unit

Symbio 700

230V

12134344

Main Unit

Symbio 700 460V/575V

12134345

Main Unit

Symbio 700

All

12134346

Main Unit

Symbio 700

230V

12134347

Main Unit Main Unit Main Unit

Symbio 700 Symbio 700 Symbio 700

460V/575V All All

12134348 12134349 12134538

Main Unit

Symbio 700

All

12134443

Main Unit
Main Unit Main Unit Main Unit

Symbio 700

All

Symbio 700

All

Symbio 700

All

Symbio 700

All

12134444
12134445 12134438 12134446

number search field or by contacting technical support.
Description
SCHEMATIC; SHEET 1, POWER, DUAL COMPRESSOR, SINGLE CONDENSER FAN, STD SCCR
SCHEMATIC; SHEET 1, POWER, DUAL COMPRESSOR, DUAL CONDENSER FAN, STD SCCR
SCHEMATIC; SHEET 1, POWER, DUAL COMPRESSOR, SINGLE CONDENSER FAN, HIGH SCC

References

• American Standard® | Air Conditioning and Heating | HVAC Systems
• Trane Heating & Air Conditioning

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