LHT LDT LHT078 Heat Pump And Dual Fuel Installation Guide

LHT LDT LHT078 Heat Pump And Dual Fuel

Product Information

Specifications

• Model Numbers: LHT/LDT078, LHT/LDT092, LHT/LDT102, LHT/LDT122, LHT/LDT150
• Packaged Units: 508320-01
• Ton Capacity: 6.5 Ton, 7.5 Ton, 8.5 Ton, 10 Ton, 12.5 Ton
• Gas Heat Section Shown

Product Usage Instructions

Safety Precautions

Before performing any maintenance or operation on the unit, ensure the following safety precautions are taken:

1. Always lockout/tagout before performing maintenance.
2. If system power is required for maintenance, disable power to blower, remove fan belt (if applicable), and set all controllers and thermostats to the OFF position.
3. Avoid contact with moving parts by keeping hands, hair, clothing, jewelry, and tools away from them.
4. Wear gloves and protective clothing to prevent injuries from sharp sheet metal edges.

Installation Instructions

For proper installation of the unit, follow these steps:

1. Rig the unit for lifting using forklift slots and lifting holes.
2. Connect gas piping for gas units and perform a pressure test.
3. Make electrical connections for power supply and control wiring according to the provided guidelines.
4. Ensure proper duct connections are made.

Start-Up Procedures

Follow these steps for starting up the unit:

1. For cooling start-up, refer to section “Cooling Start-Up” in the manual.
2. For heating start-up, follow the instructions provided for the specific model (LDT or LHT).
3. For electric heat start-up in LHT units, refer to the relevant section in the manual.

Maintenance and Service

Regular maintenance is crucial for the proper functioning of the unit. Refer to the “Service” section in the manual for detailed maintenance instructions.

FAQs

• Q: Can I perform maintenance without locking out/tagging out?
  • A: No, to prevent serious injury or death, always lockout/tagout before performing maintenance.
• Q: Where can I find the dimensions of the unit?
  • A: The dimensions can be found in the “LHT/LDT078, 092, 102H DIMENSIONS” section of the manual.
• Q: How do I download the mobile service app for this unit?
  • A: Follow the instructions in the “Download Mobile Service App” section of the manual and use the provided QR code to pair the app with the unit control system.

“`

©2024

WARNING
To prevent serious injury or death:
1 Lockout/tagout before performing maintenance.
2 If system power is required (e.g., smoke detector maintenance), disable power to blower, remove fan belt where applicable, and ensure all control lers and thermostats are set to the OFF position before performing maintenance.
3 Always keep hands, hair clothing, jewelery, tools, etc., away from moving parts.

INSTALLATION INSTRUCTIONS

LHT/LDT078 LHT/LDT092 LHT/LDT102 LHT/LDT122 LHT/LDT150
PACKAGED UNITS 508320-01 3/2024 Supersedes 11/2023

(6.5 Ton) (7.5 Ton) (8.5 Ton) (10 Ton) (12.5 Ton)

WARNING

Improper installation, adjustment, alteration, ser

vice or maintenance can cause property damage,

personal injury or loss of life. Installation and ser

vice must be performed by a licensed professional

HVAC installer or equivalent, service agency, or the

gas supplier

Cooling Start-Up

21

Heating Start-Up (LDT)

24

Heating Operation and Adjustments

26

Electric Heat Start-Up (LHT Units)

26

Cooling Operation

27

Service

28

Field-Installed Accessories

35

Unit Controller Parameter Settings

35

RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Attention! Use this QR code to download the mobile service app. Follow the prompts to pair the app with the unit control system and configure the unit. Refer to the “Download Mobile App” section in this manual and the Setup Guide provided with this unit. The QR code is also available in the unit control area.

The app can be downloaded from the appropriate iOS or Android store. Look for the following icon.

CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal in jury. Take care while handling this equipment and wear gloves and protective clothing.

LHT/LDT078, 092, 102H DIMENSIONS GAS HEAT SECTION SHOWN

6-1/8 (156)
AA

5-5/8

(143) BOTTOM SUPPLY

AIR OPENING

BB

58-1/8 (1476)

6-1/8 (156)

24 (610)

10-3/4

28

(273) 20 (711)

(508)

60-1/8 (1527) BASE
BOTTOM POWER ENTRY 5-1/2 (140) Dia.

27 (686)
BOTTOM RETURN AIR OPENING
EE

CENTER OF GRAVITY
FF

7 (178)

6-5/8 (168)

DD

BOTTOM

CC

7 (178)

CONDENSATE

34-7/8 (886)

101-1/4 BASE (2572)

TOP VIEW

OPTIONAL DISCONNECT (FACTORY INSTALLED)

99-1/4 (2521)

60-1/8 (1527)
END VIEW

46-7/8 (1191) 43-3/8 (1102)
3-1/2 (89)

1 (25) ELECTRIC INLETS
15-1/2 (394)

CONDENSATE DRAIN (FRONT)

GAS SUPPLY INLET

5-3/8 (137)

18-1/2 (470)

FLUE OUTLET

46-7/8 (1191)

34-7/8 (886)
39-7/8 (1013)

FORKLIFT SLOTS (BOTH SIDES) LIFTING HOLES (FOR RIGGING)

101-1/4 (2572)
SIDE VIEW

15-1/2 (394)

1-5/8 (41)

HORIZONTAL SUPPLY AIR
OPENING

HORIZONTAL RETURN AIR
OPENING

30 (762)

12-1/8 (308)

CONDENSATE

6-1/8

DRAIN (BACK)

5-3/8

(156)

(137)

31-1/2 (800)
66-3/8 (1686)

30 (762)

Important – Do not install horizontal economizers on this opening. Refer to

SIDE VIEW

economizer instructions for proper installation.

(Horizontal Openings)

Page 2

LHT/LDT122, 150H DIMENSIONS GAS HEAT SECTION SHOWN

6-1/8 (156)

5-5/8 (143) BOTTOM SUPPLY
AIR OPENING

6-1/8 (156)
60-1/8 (1527) BASE
BOTTOM POWER ENTRY 5-1/2 (140) Dia.
7 (178)

24 (610)
27 (686)

10-3/4

28

(273) 20 (711)

(508)

BOTTOM RETURN AIR OPENING

6-5/8 (168)
7 (178) 34-7/8 (886)

BOTTOM CONDENSATE
124-3/8 BASE (3159)
TOP VIEW

58-1/8 (1476)
60-1/8 (1527)
END VIEW

46-7/8 (1191) 43-3/8 (1102)
3-1/2 (89)

OPTIONAL DISCONNECT (FACTORY INSTALLED)

123-1/8 (3127)

5/8 (16)
ELECTRIC INLETS

CONDENSATE DRAIN (FRONT)

GAS SUPPLY INLET FLUE OUTLET

5-3/8 (137)

18-1/2

34-7/8 (886)
39-7/8 (1013)

FORKLIFT SLOTS (BOTH SIDES)
124-3/8 (3159)
SIDE VIEW

46-7/8 (1191)
LIFTING HOLES (FOR RIGGING)

15-1/2 (394)

15-1/2 (394)

HORIZONTAL SUPPLY AIR
OPENING

HORIZONTAL RETURN AIR
OPENING

54-5/8 (1387)

6-1/8 (156)
89-1/2 (2273)

CONDENSATE DRAIN (BACK)
30 (762)

SIDE VIEW

(Horizontal Openings)

5-3/8 (137)

Page 3

1-5/8 (41)
30 (762)
12-1/8 (308)

LHT078, 092, 102, 122, 150 PARTS ARRANGEMENT

FILTERS (FOUR – 20 X 25 X 2″)

INDOOR COIL

BLOWER (DIRECT DRIVE)

OUTDOOR FANS (3 ON 122 & 150)

ECONOMIZER (OPTIONAL)

WIFI ANTENNA
UNIT CONTROLLER

WIRELESS BOARD

COMPRESSORS

REVERSING VALVE

CONDENSATE DRAIN

LDT078, 092, 102, 122, 150 PARTS ARRANGEMENT

FILTERS (FOUR – 20 X 25 X 2″)

INDOOR COIL

BLOWER (DIRECT DRIVE)

ELECTRIC HEAT (OPTIONAL)

OUTDOOR COIL

OUTDOOR FANS (3 ON 122 & 150)
OUTDOOR COIL

ECONOMIZER (OPTIONAL)
WIFI ANTENNA

UNIT CONTROLLER
WIRELESS BOARD
COMPRESSORS

REVERSING VALVE

GAS VALVE
CONDENSATE DRAIN

COMBUSTION AIR INDUCER
BURNERS

IGNITION CONTROL

Page 4

Shipping and Packing List
Package 1 of 1 contains:
1 – Assembled unit
Check unit for shipping damage. Receiving party should contact last carrier immediately if shipping damage is found.
General
These instructions are intended as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation.
The LDT078, 092, 102, 122, & 150H heat pump/gas heating (dual-fuel) packaged rooftop unit is available in 130,000, 180,000, or 240,000 Btuh heating inputs.
The LHT078, 092, 102, 122, & 150 heat pump packaged rooftop unit is the same basic design as the LDT unit except for the heating section. Optional electric heat is factory- or field-installed in LHT units. Units are equipped with fin/tube outdoor coils.
Units are equipped with direct drive blowers. The blower will operate at lower speeds when demand is low and increase to higher speeds when demand is high. Refer to the Direct Drive Start-Up section.
The following examples show the model numbers of ten ton units with blower options.
LHT/LDT122H4E Single Zone Staged Direct Drive
All units are available using R410A, an ozone-friendly HFC refrigerant. Refer to the Cooling Start-Up section for precautions when installing unit.
Safety
See TABLE 1 for clearances.
WARNING
Electric shock hazard and danger of explosion. Can cause injury, death or product or property damage. Turn off gas and electrical power to unit before performing any maintenance or servicing operations on the unit. Follow lighting instructions attached to unit when putting unit back into operation and after service or maintenance.

UNIT CLEARANCES

Optional

Outdoor Air Hood

C

B D

A

FIGURE 1

TABLE 1

UNIT CLEARANCES

¹Unit

A

B

C

D

Top

Clearance in.(mm) in.(mm) in.(mm) in.(mm) Clearance

Service Clearance

60 (1524)

36 (914)

36 (914)

66

Unob-

(1676) structed

Clearance to Combusti bles

36 (914)

1 (25)

1 (25)

1

Unob-

(25) structed

Minimum Operation Clearance

36 (914)

36 (914)

36 (914)

41

Unob-

(1041) structed

NOTE Entire perimeter of unit base requires support when elevated above mounting surface.

¹Service Clearance – Required for removal of serviceable parts Clearance to Combustibles – Required clearance to combustible material (gas units). Minimum Operation Clearance – Required clearance for proper unit operation.

NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to swell. Bubbles in the rubber roofing material can cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface.

IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s and HCFC’s) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non- compliance.

Page 5

The LHT/LDT unit is ETL/CSA certified for outdoor installations only at the clearances to combustible materials listed on unit nameplate and in FIGURE 1.
Installation of LHT/LDT heat pumps must conform with standards in National Fire Protection Association (NFPA) “Standard for Installation of Air Conditioning and Ventilating Systems NFPA No. 90A,” “Standard for Installation of Residence Type Warm Air Heating and Air conditioning Systems NFPA No. 90B,” local municipal building codes and manufacturer’s installation instructions.
The National Electric Code (ANSI/NFPA No. 70-1984) is available from:
National Fire Protection Association 1 Batterymarch Park PO Box 9101 Quincy, MA 02269-9101
The LDT unit is ETL/CSA certified as a heat pump with cooling and auxiliary gas heat for non-residential use only at the clearances to combustible materials as listed on the unit nameplate and in FIGURE 1.
Installation of ETL/CSA certified units must conform with current standard C273.5 “Installation Requirements for Heat Pumps” and applicable local codes. Authorities having jurisdiction should be consulted before installation.
Use of this unit as a construction heater or air conditioner is not recommended during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.
If this unit has been used for heating or cooling of buildings or structures under construction, the following conditions must be met or the warranty will be void:
· A room thermostat or zone air temperature sensor must control the unit. The use of fixed jumpers that will provide continuous heating or cooling is not allowed.
· A pre-filter must be installed at the entry to the return air duct.
· The return air duct must be provided and sealed to the unit.
· Return air temperature range between 55°F (13°C) and 80°F (27°C) must be maintained.
· Air filters must be replaced and pre-filters must be removed upon construction completion.
· The input rate and temperature rise must be set per the unit rating plate.
· The heat exchanger, components, duct system, air filters and indoor coil must be thoroughly cleaned following final construction clean-up.
· The unit operating conditions (including airflow, cooling operation, ignition, input rate, temperature rise and venting) must be verified according to these installation instructions.

This appliance is not to be used by persons with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction.
This appliance should not be used by children. Children should be supervised to ensure they do not play with the appliance.
Unit Support
In downflow discharge installations, install the unit on a non-combustible surface only. Unit may be installed on combustible surfaces when used in horizontal discharge applications or in downflow discharge applications when installed on an C1CURB7B roof mounting frame.
NOTE – Securely fasten roof frame to roof per local codes.
CAUTION
To reduce the likelihood of supply / return air by pass and promote a proper seal with the RTU, duct work / duct drops / diffuser assemblies must be supported independently to the building structure.
A-Downflow Discharge Application Roof Mounting with C1CURB7B
1 – The C1CURB7B roof mounting frame must be installed, flashed and sealed in accordance with the instructions provided with the frame.
2 – The C1CURB7B roof mounting frame should be square and level to 1/16″ per linear foot (5mm per linear meter) in any direction.
3 – Duct must be attached to the roof mounting frame and not to the unit; supply and return plenums must be installed before setting the unit.
Installer’s Roof Mounting Frame
Many types of roof frames can be used to install the unit depending upon different roof structures. Items to keep in mind when using the building frame or supports are:
1 – The base is fully enclosed and insulated, so an enclosed frame is not required.
2 – The frames or supports must be constructed with non-combustible materials and should be square and level to 1/16″ per linear foot (5mm per linear meter) in any direction.
3 – Frame or supports must be high enough to prevent any form of moisture from entering unit. Recommended minimum frame height is 14″ (356mm).

Page 6

4 – Duct must be attached to the roof mounting frame and not to the unit. Supply and return plenums must be installed before setting the unit.
5 – Units require support along all four sides of unit base. Supports must be constructed of steel or suitably treated wood materials.
NOTE – When installing a unit on a combustible surface for downflow discharge applications, an C1CURB7*B roof mounting frame is required.
BHorizontal Discharge Applications
1 – Units installed in horizontal airflow applications must use a horizontal conversion kit K1HECK00.
2 – Specified installation clearances must be maintained when installing units. Refer to FIGURE 1.
3 – Top of support slab should be approximately 4″ (102mm) above the finished grade and located so no run-off water from higher ground can collect around the unit.
4 – Units require support along all four sides of unit base. Supports must be constructed of steel or suitably treated wood materials.
Duct Connection
All exterior ducts, joints and openings in roof or building walls must be insulated and weather-proofed with flashing and sealing compounds in accordance with applicable codes. Any duct passing through an unconditioned space must be insulated.
CAUTION
In downflow applications, do not drill or punch holes in base of unit. Leaking in roof may occur if unit base is punctured.
Rigging Unit for Lifting
Rig unit for lifting by attaching four cables to holes in unit base rail. See FIGURE 2.
1 – Detach wooden base protection before rigging. NOTE – Remove all 7 (5 brackets on units with three outdoor fans) base protection brackets before setting unit.
2 – Connect rigging to the unit base using both holes in each corner.
3 – 3All panels must be in place for rigging.
4 – Place field-provided H-style pick in place just above top edge of unit. Frame must be of adequate strength and length. (H-style pick prevents damage to unit.)

Condensate Drains
Make drain connection to the 1″ N.P.T. drain coupling provided on unit.
NOTE – The drain pan is made with a glass reinforced engineered plastic capable of withstanding typical joint torque but can be damaged with excessive force. Tighten pipe nipple hand tight and turn an additional quarter turn.
A trap must be installed between drain connection and an open vent for proper condensate removal. See FIGURE 3 or FIGURE 4. It is sometimes acceptable to drain condensate onto the roof or grade; however, a tee should be fitted to the trap to direct condensate downward. The condensate line must be vented. Check local codes concerning condensate disposal. Refer to page 1 and page 2 for condensate drain location.
RIGGING

Unit

*Weight

Lbs.

Kg.

078-150

1514

687

*Maximum weight with all available factory-installed accessories.

CAUTION – Do not walk on unit.

IMPORTANT – ALL PANELS MUST BE IN PLACE FOR RIGGING.
LIFTING POINT SHOULD BE DIRECTLY ABOVE CENTER OF GRAVITY

FIGURE 2

Page 7

CONDENSATE SIDE DRAIN CONNECTION

CAULK AROUND CONDENSATE COUPLING

NOTE – Allow clearance to open doors when installing condensate piping.

Minimum Pitch 1″ (25 mm) per 10′ (3 m) of line

OPEN VENT

UNIT

Rear Drain Connection 1 – Open blower and heat access doors. See FIGURE 5.

FILTER ACCESS DOOR

BLOWER ACCESS DOOR

MOUNTING FRAME
FIGURE 3
CONDENSATE BOTTOM DRAIN CONNECTION

HEAT ACCESS DOOR CONDENSATE DRAIN MULLION
FIGURE 5 2 – Remove six screws from filter access door. Refer to
FIGURE 6.
UNITS WITH HINGED PANELS
FILTER DOOR
CONDENSATE DRAIN MULLION

UNIT
DRAIN PAN
CAULK AROUND CONDENSATE COUPLING
OPEN VENT

MOUNTING FRAME

Minimum Pitch 1″ (25 mm) per 10′
(3 m) of line

FIGURE 4
Units are shipped with the drain coupling facing the front of the unit. Condensate can be drained from the back or bottom of the unit with the following modifications. The unit can be installed in either downflow or horizontal air discharge regardless of condensate drain location.

REMOVE THREE SCREWS (PER HINGE)
FIGURE 6
3 – Open filter access door hinges and carefully remove door.
4 – Remove eight screws holding condensate drain mullion and remove mullion.
5 – Lift front edge of the drain pan (to clear bottom drain plug) and slide drain pan out of unit. See FIGURE 7.

FIGURE 7

DRAIN PAN

Page 8

6 – Make sure the cap over the unit bottom drain hole is secure.
7 – Rotate the drain pan until the downward slope is toward the back of the unit. Slide the drain pan back into the unit. Be careful not to dislodge the cap over the bottom drain hole.
8 – From the back side of the unit, pull the drain pan coupling through the rear condensate opening.
9 – Replace the condensate drain mullion and reinstall eight screws.
10 – Reinstall filter door on hinges.
Bottom Drain Connection
1 – Open blower and heat access doors. See FIGURE 5.
2 – Remove six screws from filter access door. Refer to FIGURE 6.
3 – Open filter access door hinges and carefully remove door.
4 – Remove eight screws holding condensate drain mullion and remove mullion.
5 – Lift front edge of the drain pan (to clear bottom drain plug) and slide drain pan out of unit. See FIGURE 7.
6 – Turn the drain pan upside down and drill a pilot hole through the bottom of the drain pan in the center of the coupling. See FIGURE 8.

BOTTOM CONDENSATE DRAIN

CAUTION: Be careful not to damage the coupling threads
when drilling the hole.

DRILL A PILOT HOLE IN CENTER
OF COUPLING

After drilling the pilot hole, drill a 7/8″ hole from
the inside of the pan.
FIGURE 8

7 – From the inside of the pan, use a Vari-Bit® bit to enlarge the hole to 7/8″. Do not damage coupling threads.
8 – Remove the cap over the unit bottom drain hole.
9 – Slide the drain pan back into the unit.
10 – From the back side of the unit, pull the drain pan coupling through the rear condensate opening.
11 – From the front side of the unit, move the drain pan until the bottom coupling settles into the unit bottom drain opening. Once in place, check to make sure the coupling is still positioned through the rear condensate drain hole.
12 – Use a field-provided 1″ plug to seal side drain connection.
13 – Replace the condensate drain mullion and reinstall eight screws.
14 – Reinstall filter door on hinges.
Connect Gas Piping (Gas Units)
Before connecting piping, check with gas company or authorities having jurisdiction for local code requirements. When installing gas supply piping, length of run from gas meter must be considered in determining pipe size for 0.5″ w.c. (.12kPa) maximum pressure drop. Do not use supply pipe smaller than unit gas connection. For natural gas units, operating pressure at the unit gas connection must be a minimum of 4.7″ w.c. (1.17kPa) and a maximum of 10.5″ (2.60kPa) w.c. For LP/propane gas units, operating pressure at the unit gas connection must be a minimum of 10.5″ w.c. (2.61kPa) and a maximum of 13.0″ w.c. (3.23kPa).
When making piping connections a drip leg should be installed on vertical pipe runs to serve as a trap for sediment or condensate. A 1/8″ N.P.T. plugged tap is located on gas valve for test gauge connection. Refer to Heating Start-Up section for tap location. Install a ground joint union between the gas control manifold and the main manual shut-off valve. See FIGURE 9 for gas supply piping entering outside the unit. FIGURE 10 shows bottom gas entry piping through the curb. FIGURE 11 shows bottom gas entry piping through the unit.
Compounds used on threaded joints of gas piping shall be resistant to the action of liquefied petroleum gases.

Page 9

OUTSIDE OF UNIT GAS PIPE CONNECTION

GROUND JOINT UNION
TO GAS SUPPLY

TO GAS VALVE

GAS PIPING SUPPORT
MANUAL MAIN SHUT-OFF VALVE

DRIP LEG
(REFER TO LOCAL CODES)

FIGURE 9

BOTTOM ENTRY GAS PIPING THROUGH THE CURB

MULLION BETWEEN

SOR SECTIONS

4″ NIPPLE

4″ NIPPLE
TO GAS VALVE

GROMMET
ALL ELBOWS ARE 3/4″
MANUAL MAIN SHUT-OFF VALVE

5″ NIPPLE
7-1/2″ NIPPLE
GROUND JOINT UNION
4″ NIPPLE

TO GAS SUPPLY
10″ NIPPLE
ROOF MOUNTING
FRAME
FIGURE 10

3-1/2″ NIPPLE
3″ NIPPLE
DRIP LEG

BOTTOM GAS ENTRY

THROUGH THE UNIT

ALL ELBOWS ARE 3/4″

MULLION BETWEEN

10″ NIPPLE
GROMMET

GROMMET
7-1/2″ NIPPLE

SOR SECTIONS
5″ NIPPLE
4″ NIPPLE

4″ NIPPLE

7″ NIPPLE

TO GAS SUPPLY

ALTERNATE KNOCKOUTS
ROOF MOUNTING FRAME
DRIP LEG

3″ NIPPLE

TO GAS VALVE
GROUND JOINT UNION
4″ NIPPLE
MANUAL MAIN SHUT-OFF VALVE
3-1/2″ NIPPLE

FIGURE 11
Pressure Test Gas Piping (Gas Units)
When pressure testing gas lines, the gas valve must be disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5 psig (3.48kPa). See FIGURE 12. NOTE – Codes may require that manual main shut-off valve and union (furnished by installer) be installed in gas line external to unit. Union must be of the ground joint type.
After all connections have been made, check all piping connections for gas leaks. Also check existing unit gas connections up to the gas valve; loosening may occur during installation. Use a leak detection solution or other preferred means. Do not use matches candles or other sources of ignition to check for gas leaks. NOTE – In case emergency shut down is required, turn off the main manual shut-off valve and disconnect main power to unit. These devices should be properly labeled by the installer.

Page 10

PRESSURE TEST GAS LINE
MANUAL MAIN SHUT-OFF VALVE

GAS VALVE

CAP

FIGURE 12

CAUTION
Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.

WARNING
Danger of explosion. Can cause injury or product or property damage. Do not use matches, candles, flame or other sources of ignition to check for leaks.

High Altitude Derate
Locate the high altitude conversion sticker in the unit literature bag. Fill out the conversion sticker and affix next to the unit nameplate. High altitude kits are available for field-installation.
Refer to TABLE 2 for high altitude adjustments.

TABLE 2

Altitude Ft.*

Gas Manifold Pressure

2000-4500

See Unit Nameplate

4500 and Above

Derate 4% / 1000 Ft. above Sea Level

*Units installed at 0-2000 feet do not need to be modified

NOTE – This is the only permissible derate for these units.

Download Mobile Service App
AMobile Device Requirements
· Android hardware requires 2GB RAM and a 2Ghz core processor. Tablets are supported.
· Minimum Android 6.0 (Marshmallow) or higher. Recommend Android 10 and Apple products require iOS version 11 or higher.
BNew Installations
Once the app is downloaded, refer to the Setup Guide provided with this unit to pair the app to the unit control system. Follow the setup wizard prompts to configure the unit. See FIGURE 13 for the app menu overview. If a mobile device is unavailable or not pairing, refer to the Unit Controller Setup Guide for start-up instructions.
MOBILE SERVICE APP MENU OVERVIEW

MENU

RTU MENU

SETUP

INSTALL
NETWORK INTEGRATION
TEST AND BALANCE

SERVICE
SETTINGS
FIGURE 13

ALARM HISTORY DATA TRENDING
FACTORY RUNTIMES SYSTEM DATA / SENSORS / OUTPUTS
COMPONENT TEST REPORT
ADVANCED CONTROL FIRMWARE UPDATE
RTU OPTION INSTALL

Page 11

Electrical Connections Power Supply
Route field wiring in conduit between bottom power entry disconnect. See FIGURE 14. This does not supersede local codes or authorities having jurisdiction.
Do not apply power or close disconnect switch until installation is complete. Refer to start-up directions. Refer closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity and maximum fuse size.
1 – 230/460/575 volt units are factory wired. For 208V supply, disconnect the orange wire (230V) at all control power transformer(s). Reconnect the red wire (208V). Tape the exposed end of the 230V orange wire.
2 – Route power through the bottom power entry area. On gas units or units with electric heat, connect power wiring to TB2. On cooling only units, connect power to F4. If unit contains an optional factory-installed circuit breaker or disconnect switch, connect line voltage to CB10 or S48. See unit wiring diagram.
3 – Connect separate 120v wiring to optional field-powered GFCI outlet. Route field wiring in conduit between bottom power entry and GFCI. See FIGURE 14. For unit-powered GFCI, no additional field wiring is required.
FIELD WIRE ROUTING

SIDE ENTRY KNOCKOUTS

MAKE-UP BOX
OPTIONAL 120V GFI

SEAL WATERTIGHT

RUN FIELD WIRING IN
VIDED CONDUIT BOTTOM POWER ENTRY
FIGURE 14

Electrical Connections Control Wiring
NOTE – Optional wireless sensors are available for use with this unit. Refer to the instructions provided with each sensor.
CAUTION
Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hands and all tools on an unpainted unit surface, such as the gas valve or blower deck, before per forming any service procedure.
AThermostat Location
Applied to units in default thermostat control mode only. Room thermostat mounts vertically on a standard 2″ X 4″ handy box or on any non-conductive flat surface.
Locate thermostat approximately 5 feet (1524mm) above the floor in an area with good air circulation at average temperature. Avoid locating the room thermostat where it might be affected by:
· drafts or dead spots behind doors and in corners
· hot or cold air from ducts
· radiant heat from sun or appliances
· concealed pipes and chimneys IMPORTANT – Unless field thermostat wires are rated for maximum unit voltage, they must be routed away from line voltage wiring.
BControl Wiring
The Unit Controller will operate the unit from a thermostat or zone sensor based on the System Mode. The default System Mode is the thermostat mode. Refer to the Unit Controller Setup Guide to change the System Mode. Use the mobile service app menu and select Settings > Install.
Thermostat Mode
1 – Route thermostat cable or wires from subbase to control area above compressor (refer to unit dimensions to locate bottom and side power entry).
IMPORTANT – Unless field thermostat wires are rated for maximum unit voltage, they must be routed away from line voltage wiring. Use wire ties located near the lower left corner of the controls mounting panel to secure thermostat cable.
Use 18 AWG wire for all applications using remotely installed electro- mechanical and electronic thermostats.
2 – Install thermostat assembly in accordance with instructions provided with thermostat.

Page 12

3 – Connect thermostat wiring to Unit Controller on the lower side of the controls hat section.
4 – Wire as shown in FIGURE 15 for electro-mechanical and electronic thermostats. If using other temperature control devices or energy management systems see instructions and wiring diagram provided by manufacturer.
IMPORTANT – Terminal connections at the Unit Controller must be made securely. Loose control wire connections may allow unit to operate but not with proper response to room demand.
24 VOLT FIELD WIRING IN THERMOSTAT MODE

P262 J262C

24 V POWER

J297A P297

R

1

A55

10

C

2

B

11

G

3

W1

4

W1

W2

5

W2

12

Y1

6

Y2

7

OCP

8

C

9

10

D

Zone Sensor Mode
The Unit Controller will operate heating and cooling based on the Unit Controller internal setpoints and the temperature from the A2 room sensor. An optional Network Control Panel (NCP) can also be used to provide setpoints. A thermostat or return air sensor can be used as a back-up mode. Make room sensor wiring connections as shown in FIGURE 16.
FIELD WIRING IN ZONE SENSOR MODE (Zone Sensor Mode)

UNIT CONTROLLER

24VAC SENSOR SENSOR IAQ

INPUTS

R C AI1

HUM TMP AI2 C R

J298

A2 SENSOR
FIGURE 16

FIGURE 15

Page 13

Blower Operation

Units are equipped with variable speed, direct drive blowers. The supply CFM can be adjusted by changing the percentage of motor output using the Unit Controller settings. Measure the intake air CFM and adjust the RPM% to get design-specified supply air CFM. Refer to the Direct Drive Blower Start-Up section.
IMPORTANT
Compressor two is the only component that must be checked to ensure proper phasing. Follow “COOLING START-UP” section of installation instructions to en sure proper compressor and blower operation.
The Unit Controller checks the incoming power during start-up. If the voltage or phase is incorrect, the Unit Controller will display an alarm and the unit will not start.
ABlower Operation
Refer to the Unit Controller Setup Guide to energize blower. Use the mobile service app menu; see:
SERVICE > TEST
In both thermostat and zone control mode, the Unit Controller will stage the blower between low and high speed.
WARNING
1- Make sure that unit is installed in accordance with the installation instructions and applicable codes.
2- Inspect all electrical wiring, both field and factoryinstalled, for loose connections. Tighten as required.
3- Check to ensure that refrigerant lines do not rub against the cabinet or against other refrigerant lines.
4- Check voltage at disconnect switch. Voltage must be within range listed on nameplate. If not, consult power company and have voltage condition corrected before starting unit.
5- Make sure filters are new and in place before start-up.

Initiate blower only (G) demand at thermostat according to instructions provided with thermostat. Unit will cycle on thermostat demand. The following steps apply to applications using a typical electro-mechanical thermostat.
1 – Blower operation is manually set at the thermostat subbase fan switch. With fan switch in ON position, blowers will operate continuously.
2 – With fan switch in AUTO position, the blowers will cycle with demand. Blowers and entire unit will be off when system switch is in OFF position.
NOTE – Blower operation mode can also be initiated by the mobile service app.
Direct-drive motor may not immediately stop when power is interrupted to the Unit Controller. Disconnect unit power before opening the blower compartment. The Controller’s digital inputs must be used to shut down the blower. See Unit Controller manual for operation sequences.
B-Blower Access
The blower assembly is secured to a sliding frame which allows the blower assembly to be pulled out of the unit. See FIGURE 18.
1 – Loosen the reusable wire tie which secures the controls and high voltage blower wiring to the blower housing. Disconnect the pressure sensor low voltage wire harness.
2 – Remove and retain screws on either side (and on the front for direct drive) of sliding frame. Use the metal handle to pull frame toward outside of unit.
3 – Slide frame back into original position when finished servicing. Reattach the blower wiring in the previous location using the wire tie. Reconnect pressure sensor low voltage wire harness.
4 – Replace retained screws.

Page 14

LOCATION OF STATIC PRESSURE READINGS

INSTALLATIONS WITH DUCTWORK

INSTALLATIONS WITH CEILING DIFFUSERS

ROOFTOP UNIT

ROOFTOP UNIT

RETURN AIR READING LOCATION

SUPPLY TURN
MAIN DUCT RUN

FIRST BRANCH OFF OF MAIN RUN

SUPPLY AIR READING LOCATION

SUPPLY AIR READING LOCATION

FIGURE 17

SUPPLY TURN
DIFFUSER

DIRECT DRIVE BLOWER ASSEMBLY

BLOWER HOUSING

RETURN AIR READING LOCATION

BLOWER MOTOR SECURED TO THIS SIDE OF HOUSING

REMOVE TWO SCREWS ON EACH SIDE TO SLIDE BLOWER OUT OF UNIT

INLET GRID

FIGURE 18

Page 15

Direct Drive Blower StartUp
The supply CFM can be adjusted by changing the percentage of motor output using the Unit Controller settings Refer to TABLE 3 for menu paths and default settings. Record any RPM% changes on the parameter settings label located on the inside of the compressor access panel.
IMPORTANT
The BLOWER CALIBRATION process starts the in door blower at operational speeds and moves the economizer damper blades. Before starting this process, replace any access panels and close all unit doors except compressor compartment door.

Blower calibration is required only on units that are newly installed or if there is a change in the duct work or air filters after installation. Use the mobile service app to navigate to the SETUP>TEST & BALANCE>BLOWER menu. After the new CFM values are entered, select START CALIBRATION. The blower calibration status is displayed as a % complete. Upon successful completion, the mobile service app will display CALIBRATION SUCCESS and go back to the blower calibration screen.
IMPORTANT – The default value for Cooling Low CFM is lower than a traditional singe- or two-speed unit. If operating the unit with a 2- or 3-stage controller (2- or 3-stage thermostat, DDC controller, etc.), it is recommended to increase the Cooling Low CFM default value to a suitable level for part load cooling (typically 60% of full load CFM).

TABLE 3

DIRECT DRIVE PARAMETER SETTINGS

58110201

Parameter

Field Setting

Description

NOTE – Any changes to Smoke CFM setting must be adjusted before the other CFM settings. Use SETTINGS > RTU OP TIONS > EDIT PARAMETERS = 12 for EBM, 6 for ECM

BLOWER SMOKE CFM

% Percentage of RPM for blower smoke speed.

SETUP > TEST & BALANCE > BLOWER

BLOWER HEATING HIGH CFM

% Percentage of RPM for blower heating high speed.

BLOWER HEATING LOW CFM

% Percentage of RPM for blower heating low speed (P volt gas heat only).

BLOWER COOLING HIGH CFM

% Percentage of RPM for blower cooling high speed.

BLOWER COOLING LOW CFM

%

Percentage of RPM for blower cooling low speed and vent speed for standard static blowers.

BLOWR VENTILATION CFM

% Percentage of RPM for high static blower ventilation speed.

SETUP > TEST & BALANCE > DAMPER

BLOWER HIGH CFM DAMPER POS %

% Minimum damper position for high speed blower operation. Default 0%.

BLOWER LOW CFM DAMPER PS %

% Minimum damper position for low speed blower operation. Default 0%.

POWER EXHAUST DAMPER POS %

% Minimum damper position for low power exhaust operation. Default 50%.

SETTING > RTU OPTIONS > EDIT PARAMETERS = 216

POWER EXHAUST DEADBAND %

% Deadband % for power exhaust operation. Default 10%.

SETTINGS > RTU OPTIONS > EDIT PARAMETERS = 10 (Applies to Thermostat Mode ONLY)

FREE COOLING STAGE-UP DELAY

sec

Number of seconds to hold blower at low speed before switching to blower at high speed. Default 300 seconds.

Installer Record any parameter changes under “Field Setting” column. Settings need to be recorded by installer for use when Unit Controller is replaced or reprogrammed.

Page 16

BLOWER DATA

BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY (NO HEAT SECTION) WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE.

FOR ALL UNITS ADD:

1- Wet indoor coil air resistance of selected unit.

2- Any factory installed options air resistance (heat section, Economizer, etc.)

3- Any field installed accessories air resistance (duct resistance, diffuser, etc.) See page 18 for wet coil and option/accessory air resistance data.

See page 18 for minimum air volume required for use with optional electric heat.

Maximum Static Pressure With Gas Heat 2.0 in. w.g.

Minimum Air Volume Required For Different Gas Heat Sizes: Standard – 2150 cfm; Medium – 2250 cfm; High – 2600 cfm

Total Air Volume
cfm

0.2 RPM Watts

0.4 RPM Watts

Total Static Pressure in. w.g.

0.6

0.8

1.0

RPM Watts RPM Watts RPM Watts

1.2 RPM Watts

1.4 RPM Watts

1750

759

223

864

298

961

359 1049 420 1128 508 1199 607 1260 704

2000

846

271

943

345 1035 410 1117 488 1189 598 1255 704 1313 804

2250

945

303 1030 391 1111 476 1184 577 1247 697 1310 806 1367 905

2500 1035 366 1109 476 1180 583 1245 688 1306 797 1368 903 1426 1008

2750

1113

476

1182

601 1248

715

1310

809

1371 902 1432 1011 1491 1129

3000

1195

596

1261 718 1324

827

1385

922

1444 1024 1503 1146 1559 1279

3250 1282 711 1346 827 1406 935 1464 1044 1521 1167 1576 1306 1629 1460

3500 1372 821 1432 940 1489 1060 1544 1192 1598 1337 1650 1494 1700 1663

3750 1461 949 1517 1081 1571 1221 1624 1373 1675 1532 1725 1700 1773 1875

4000 1549 1109 1602 1256 1653 1413 1703 1576 1753 1743 1801 1916 1847 2091

4250 1637 1298 1687 1458 1735 1625 1784 1795 1831 1966 1877 2139 1923 2310

4500 1724 1510 1772 1678 1818 1851 1864 2023 1910 2195 1955 2365 2000 2530

4750

1811 1738 1856 1910 1901 2083 1946 2254 1990 2423 2034 2587 2079 2746

5000 1897 1973 1941 2144 1985 2314 2028 2480 2071 2644 2114 2805 2158 2959

5250 1983 2205 2026 2373 2069 2538 2111 2699 2153 2860 2195 3017 – – –

– – –

5500 2070 2428 2112 2595 2153 2756 2194 2912 – – –

– – –

– – –

– – –

– – –

– – –

5750 2156 2643 2197 2809 – – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

Total Air Volume
cfm

1.6 RPM Watts

1.8 RPM Watts

Total Static Pressure in. w.g.

2.0

2.2

2.4

RPM Watts RPM Watts RPM Watts

2.6 RPM Watts

1750 1316 793 1373 875 1432 963 1491 1064 1548 1175 1604 1300

2000 1368 894 1425 982 1483 1081 1540 1196 1596 1322 1650 1458

2250 1423 1001 1480 1101 1537 1216 1593 1344 1647 1483 1700 1629

2500 1483 1117 1539 1236 1594 1368 1648 1509 1700 1657 1752 1810

2750 1547 1256 1601 1394 1654 1539 1705 1690 1756 1846 1806 2004

3000 1612 1425 1664 1577 1715 1734 1765 1893 1815 2053 1864 2213

3250 1680 1623 1729 1787 1778 1949 1828 2110 1876 2269 1925 2426

3500 1748 1835 1796 2003 1844 2165 1893 2324 1942 2479 1991 2633

3750 1819 2048 1866 2214 1914 2374 1963 2530 2012 2684 2061 2837

4000 1893 2260 1940 2423 1988 2581 2036 2737 2084 2891 2134 3044

4250 1969 2475 2016 2634 2063 2790 2111 2945 2159 3098 – – –

– – –

4500 2046 2689 2093 2844 2140 2998 2187 3153 – – –

– – –

– – –

– – –

4750 2124 2900 2170 3053 – – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

5000 2203 3111 – – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

5250

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

5500

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

– – –

Page 17

BLOWER DATA

FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE in. w.g.

Air Volume
cfm

Wet Indoor Coil

Gas Heat Exchanger

092, 102

122, 150

Standard Heat

Medium Heat

High Heat

Electric Heat (LHT)

Econo mizer

MERV 8

1750

0.04

0.04

0.06

0.02

0.02

0.03

0.05

0.01

2000

0.05

0.05

0.07

0.05

0.06

0.03

0.06

0.01

2250

0.06

0.06

0.07

0.07

0.08

0.04

0.08

0.01

2500

0.07

0.07

0.09

0.10

0.11

0.04

0.11

0.01

2750

0.08

0.08

0.09

0.11

0.12

0.05

0.12

0.02

3000

0.10

0.09

0.11

0.12

0.13

0.06

0.13

0.02

3250

0.11

0.10

0.12

0.15

0.16

0.06

0.15

0.02

3500

0.12

0.11

0.12

0.16

0.17

0.09

0.15

0.03

3750

0.14

0.13

0.14

0.19

0.20

0.09

0.15

0.03

4000

0.15

0.14

0.14

0.21

0.22

0.09

0.19

0.04

4250

0.17

0.15

0.14

0.24

0.28

0.13

0.19

0.04

4500

0.19

0.17

0.15

0.26

0.32

0.14

0.22

0.04

4750

0.20

0.18

0.16

0.29

0.37

0.17

0.25

0.05

5000

0.22

0.20

0.16

0.34

0.43

0.20

0.29

0.06

5250

0.24

0.22

0.16

0.37

0.47

0.22

0.32

0.06

5500

0.25

0.23

0.18

0.44

0.54

0.25

0.34

0.07

5750

0.27

0.25

0.19

0.49

0.59

0.31

0.45

0.07

6000

0.29

0.27

0.20

0.54

0.64

0.33

0.52

0.08

Filters

MERV 13 MERV 16

0.03

0.06

0.03

0.08

0.04

0.09

0.05

0.10

0.05

0.11

0.06

0.12

0.06

0.13

0.07

0.15

0.08

0.16

0.08

0.17

0.09

0.19

0.09

0.20

0.10

0.21

0.10

0.23

0.11

0.24

0.12

0.25

0.12

0.27

0.13

0.28

Return Air
Adaptor Plate 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.04 0.07 0.09 0.11 0.12 0.16 0.18 0.19 0.22 0.25 0.27

MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT

Electric Heat kW

Minimum cfm

7.5

1750

15

2250

22.5

2250

30

2750

45

2750

60

3500

Page 18

Cooling StartUp
IMPORTANT – The crankcase heater must be energized for 24 hours before attempting to start compressor. Set thermostat so there is no demand to prevent compressors from cycling. Apply power to unit.
AStartUp
1 – Initiate full load cooling operation using the following mobile service app menu path:
RTU MENU > SERVICE > COMPONENT TEST > COOLING > COOLING STAGE 3
2 – Refer to Cooling Operation section for cooling startup.
3 – Units have two refrigerant circuits. See FIGURE 19 or FIGURE 20.
4 – Each refrigerant circuit is charged with R410A refrigerant. See unit rating plate for correct amount of charge.
5 – Refer to Refrigerant Check and Charge section for proper method to check refrigerant charge.

REFRIGERANT STAGES – TWO FANS LHT/LDT078, 092, 102H:
Two-Stage Thermostat/Control:
Y1 Demand = Outdoor Fan 1 HIGH Speed, Fan 2 OFF Y2 Demand = Outdoor Fans 1 & 2 HIGH Speed W1 Demand (Heat Pump Heating) =
Outdoor Fans 1 & 2 HIGH Speed
Three-Stage Thermostat/Control:
Y1 Demand = Outdoor Fan 1 LOW Speed, Fan 2 OFF Y2 Demand = Outdoor Fans 1, 2 MEDIUM Speed Y3 Demand = Outdoor fans 1, 2, HIGH Speed W1 Demand (HP Heating)=
Outdoor Fans 1, 2 High Speed

INDOOR COIL STAGE 2

OUTDOOR COIL STAGE 2
B5

OUTDOOR FAN 2
OUTDOOR FAN 1

B4

2

1

OUTDOOR COIL INDOOR COIL STAGE 1
STAGE 1

FIGURE 19

REFRIGERANT STAGES – THREE FANS LHT/LDT122, 150H:

Two-Stage Thermostat/Control:

Y1 Demand = Outdoor Fans 1, 2, & 3 MEDIUM Speed Y2 Demand = Outdoor Fans 1, 2 & 3 HIGH Speed W1 Demand (Heat Pump Heating) =
Outdoor Fans 1, 2, 3 HIGH Speed

Three-Stage Thermostat/Control:

Y1 Demand = Outdoor Fans 1, 2, & 3 LOW Speed Y2 Demand = Outdoor Fans 1, 2, & 3 MEDIUM Speed Y3 Demand = Outdoor Fans 1, 2, & 3 HIGH Speed W1 Demand (HP Heating)=
Outdoor Fans 1, 2, & 3 HIGH Speed

INDOOR COIL STAGE 2

OUTDOOR COIL STAGE 2

OUTDOOR FAN 2 OUTDOOR FAN 3

OUTDOOR

B5

FAN 1

B21

B4

2

1

OUTDOOR COIL INDOOR COIL STAGE 1
STAGE 1

FIGURE 20
BR410A Refrigerant
Units charged with R410A refrigerant operate at much higher pressures than R22. The expansion valve and liquid line drier provided with the unit are approved for use with R410A. Do not replace them with components designed for use with R22.
R410A refrigerant is stored in a pink cylinder.
Manifold gauge sets used with systems charged with R410A refrigerant must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0-800 on the high side and a low side of 30″ vacuum to 250 psi with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psi of pressure with a 4000 psi burst rating.

IMPORTANT
Mineral oils are not compatible with R410A. If oil must be added, it must be a polyol ester oil.

Page 19

CRefrigerant Charge and Check Fin/Tube
WARNING Do not exceed nameplate charge under any condition.
This unit is factory charged and should require no further adjustment. If the system requires additional refrigerant, reclaim the charge, evacuate the system, and add required nameplate charge. NOTE – System charging is not recommended below 60°F (15°C). In temperatures below 60°F (15°C) , the charge must be weighed into the system.
If weighing facilities are not available, or to check the charge, use the following procedure:
1 – Attach gauge manifolds to discharge and suction lines. With the economizer disabled, operate the unit in cooling mode at high speed using the following mobile service app menu path:
SERVICE > COMPONENT TEST > COOLING > COOLING STAGE 3
2 – Check each system separately with all stages operating.
3 – Use a thermometer to accurately measure the outdoor ambient temperature.
4 – Apply the outdoor temperature to TABLE 4 through TABLE 8 to determine normal operating pressures. Pressures are listed for sea level applications at 80°F dry bulb and 67°F wet bulb return air.
5 – Compare the normal operating pressures to the pressures obtained from the gauges. Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Correct any system problems before proceeding.
6 – If discharge pressure is high, remove refrigerant from the system. If discharge pressure is low, add refrigerant to the system.
· Add or remove charge in increments.
· Allow the system to stabilize each time refrigerant is added or removed.
7 – Use the following approach method along with the normal operating pressures to confirm readings.

TABLE 4 58111801 LHT/LDT078

OD Coil Entering Air Temp

Disch. + 10 psig

Circuit 1

Suct. +

Appr.

5 psig Temp +1°F

Circuit 2

Disch. + Suct. +

Appr.

10 psig 5 psig Temp + 1°F

65°F

244 132

5

236 145

4

75°F

281 134

3

271 146

3

85°F

322 136

3

309 148

2

95°F

366 138

3

354 150

2

100°F 415 139

4

399 152

2

115°F 464 141

4

449 154

3

OD Coil Entering
Temp.
65 °F 75 °F 85 °F 95 °F 105 °F 115 °F

TABLE 5 58111901 LHT/LDT092

CIRCUIT 1

CIRCUIT 2

Disch. + 10 psig

Suct. + 5 psig

Appr.

Disch. + Suct. +

Temp+1°F 10 psig 5 psig

Appr. Temp+1°F

250 139

4

253 139

8

286 140

4

291 140

7

326 141

4

331 141

6

370 142

3

376 143

5

417 144

4

426 146

7

468 146

5

481 148

7

OD Coil Entering
Temp.
65 °F 75 °F 85 °F 95 °F 105 °F 115 °F

TABLE 6 58112001 LHT/LDT102

CIRCUIT 1

CIRCUIT 2

Disch. + Suct. +

Appr.

10 psig 5 psig Temp+1°F

Disch. + 10 psig

Suct. + 5 psig

Appr. Temp+1°F

245 139

3

258

130

3

283 142

3

296

133

4

321 141

3

336

133

4

370 146

4

389

138

6

417 148

5

435

141

7

469 151

6

492

144

8

OD Coil Entering
Temp.
65 °F 75 °F 85 °F 95 °F 105 °F 115 °F

TABLE 7 58112101 LHT/LDT122

CIRCUIT 1

CIRCUIT 2

Disch. + 10 psig

Suct. + 5 psig

Appr. Temp+1°F

Disch. + Suct. + 5

Appr.

10 psig

psig

Temp+1°F

248 126

1

256

125

2

285 128

0

293

127

0

326 130

0

334

129

0

372 132

0

379

131

0

420 135

1

426

134

0

475 139

1

477

137

0

OD Coil Entering
Temp.
65 °F 75 °F 85 °F 95 °F 105 °F 115 °F

TABLE 8 58112201 LHT/LDT150

CIRCUIT 1

CIRCUIT 2

Disch. + Suct. +

Appr.

10 psig 5 psig Temp+1°F

Disch. + Suct. + 5

Appr.

10 psig

psig

Temp+1°F

255 125

3

252

112

3

295 128

0

293

124

0

337 130

0

335

130

0

382 134

1

381

133

0

430 136

1

427

135

1

485 139

2

476

137

1

Page 20

Charge Verification – Approach Method – AHRI Testing
1 – Using the same thermometer, compare liquid temperature to outdoor ambient temperature. Approach Temperature = Liquid temperature (at condenser outlet) minus ambient temperature.
2 – Refer to TABLES 4-8 for approach temperatures. An approach temperature greater than value shown indicates an undercharge. An approach temperature less than value shown indicates an overcharge.
3 – The approach method is not valid for grossly over or undercharged systems. Use TABLE 4-8 as a guide for typical operating pressures.
FCompressor Controls
See unit wiring diagram to determine which controls are used on each unit.
1 – High Pressure Switch (S4, S7)
The compressor circuit is protected by a high pressure switch which opens at 640 psig + 10 psig (4413 kPa + 70 kPa) and automatically resets at 475 psig + 20 psig (3275kPa + 138 kPa).
2 – Low Pressure Switch (S87, S88)
The compressor circuit is protected by a loss of charge switch. Switch opens at 25 psig + 5 psig (172 + 34 kPa) and automatically resets at 40 psig + 5 psig (276 kPa + 34 kPa).
3 – Crankcase Heater (HR1, HR2)
Compressors have belly band compressor oil heaters which must be on 24 hours before running compressors. Energize by setting thermostat so that there is no cooling demand, to prevent compressor from cycling, and apply power to unit.
4 – Diagnostics Sensors (RT46-RT49)
Four thermistors are located on specific points in the refrigeration circuit. The thermistors provide constant temperature feedback to the Unit Controller to protect the compressor. Thermistors take the place of the freezestat and low ambient pressure switch.

Cooling StartUp
Units are equipped with four factory-installed thermistors (RT46 – RT49) located on different points on the refrigerant circuit.
The thermistors provide the Unit Controller with constant temperature readings of four specific locations on the refrigeration circuit. These temperatures are used as feedback in certain modes of unit operation. In addition, the Unit Controller uses these temperatures to initiate alarms such as loss of outdoor or indoor coil airflow.
Each thermistor must be specifically placed for proper unit operation and to initiate valid alarms. See FIGURE 21 and FIGURE 22 for proper locations.

Page 21

LHT/LDT078, 092, 102, 122, 150 INDOOR COIL RT46, RT47

22J06
BLUE RT47
22J06
YELLOW RT46

FIGURE 21 Page 22

DETAILS NOT TO SCALE

LHT/LDT078, 092, 102, 122, 150 OUTDOOR COIL RT48, RT49

22J08
BLUE RT49

22J08
YELLOW RT48
FIGURE 22 Page 23

DETAILS NOT TO SCALE

Heating StartUp (LDT)
FOR YOUR SAFETY, READ BEFORE LIGHTING.
WARNING
Electric shock hazard. Can cause injury or death. Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water.
WARNING
Danger of explosion. Can cause injury or product or property damage. If overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.
WARNING
Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.
WARNING
SMOKE POTENTIAL The heat exchanger in this unit could be a source of smoke on initial firing. Take precautions with respect to building occupants and property. Vent initial sup ply air outside when possible.
BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, do not try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.
WARNING
Danger of explosion. Can cause injury or death. Do not attempt to light manually. Unit has a direct spark ignition system.

This unit is equipped with an automatic spark ignition system. There is no pilot. In case of a safety shutdown, move thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control.
APlacing Unit In Operation
WARNING
Danger of explosion and fire. Can cause injury or product or property damage. You must follow these instructions exactly.
Gas Valve Operation for Honeywell VR8205Q/VR8305Q and White Rodgers 36H54 (FIGURE 23 and FIGURE 24).

WHITE RODGERS 36H54 GAS VALVE

INLET PRESSURE
TAP

Two-Stage

MANIFOLD PRESSURE
TAP

HIGH FIRE ADJUSTMENT

LOW FIRE ADJUSTMENT

GAS VALVE SWITCH SHOWN IN ON POSITION.
FIGURE 23

HONEYWELL VR8205Q/VR8305Q GAS VALVE

HIGH FIRE ADJUSTMENT

LOW FIRE ADJUSTMENT

MANIFOLD PRESSURE
TAP

INLET PRESSURE
TAP
GAS VALVE KNOB IS SHOWN IN OFF POSITION.
FIGURE 24 1 – Set balance point setpoint above the outdoor ambi-
ent temperature to disable heat pump operation. 2 – Set thermostat to lowest setting. 3 – Turn off all electrical power to appliance.

Page 24

4 – This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
5 – Open or remove the heat section access panel.
6 – Turn gas valve switch to OFF. See FIGURE 23. On Honeywell VR8305Q gas valves, turn the knob on the gas valve clockwise to OFF. Do not force. See FIGURE 24.
7 – Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you do not smell gas, go to the next step.
8 – Turn gas valve switch to ON. See FIGURE 23. On Honeywell VR8305Q gas valves, turn the knob on the gas valve counterclockwise to ON. Do not force. See FIGURE 24.
9 – Close or replace the heat section access panel.
10 – Turn on all electrical power to appliance.
11 – Set thermostat to desired setting.
12 – The ignition sequence will start.

13 – If the appliance does not light the first time (gas line not fully purged), it will attempt up to two more ignitions before locking out.
14 – If lockout occurs, repeat steps 1 through 10.
15 – If the appliance will not operate, follow the instructions “Turning Off Gas to Appliance” and call your service technician or gas supplier.
Turning Off Gas to Unit 1 – If using an electromechanical thermostat, set to the
lowest setting.
2 – Before performing any service, turn off all electrical power to the appliance.
3 – Open or remove the heat section access panel.
4 – Turn gas valve switch to OFF. On Honeywell VR8305 gas valves, turn the knob on the gas valve clockwise to OFF. Do not force.
5 – Close or replace the heat section access panel.
WARNING
Danger of explosion. Can cause injury or death. Do not attempt to light manually. Unit has a direct spark ignition system.

Page 25

Heating Operation and Adjustments
(Gas Units)
AHeating Sequence of Operation
1 – On a heating demand the combustion air inducer starts immediately.
2 – Combustion air pressure switch proves inducer operation. After a 30-second pre-purge, power is allowed to ignition control. Switch is factory set and requires no adjustment.
3 – Spark ignitor energizes and gas valve solenoid opens.
4 – Spark ignites gas, ignition sensor proves the flame and combustion continues.
5 – If flame is not detected after first ignition trial, ignition control will repeat steps 3 and 4 two more times before locking out the gas valve.
6 – For troubleshooting purposes, an ignition attempt after lock out may be re-established manually. Move thermostat to OFF and return thermostat switch to HEAT position.
BLDT Heating Stages

TABLE 9

Outdoor Ambient Temperature

W1 Demand

W2 Demand

Above Balance Point Temperature Setting
Below Balance Point Temperature Setting

Compr. 1 & 2 On* Gas Heat Off
Compr. 1 & 2 Off Gas Heat Low

Compr. 1 & 2 Off Gas Heat High
Compr. 1 & 2 Off Gas Heat High

*L1 and L2 reversing valves are de-energized with a heating demand. The heat pump will heat only, not cool.

**Balance Point temperature setting can be adjusted using the following mobile service app menu path:

RTU MENU > SETTING > RTU OPTIONS > EDIT PA RAMETER = 526 (HP DF BALANCE POINT)

CLimit Controls
Limit controls are factory-set and are not adjustable. The primary limit is located on the blower deck to the right of the blower housing.
DHeating Adjustment
Main burners are factory-set and do not require adjustment.
The following manifold pressures are listed on the gas valve.
Natural Gas Units – Low Fire – 1.6″ w.c. (not adjustable Natural Gas Units – High Fire – 3.7″ w.c. LP Gas Units – Low Fire – 5.5″ w.c. (not adjustable) LP Gas Units – High Fire – 10.5″ w.c.
Electric Heat StartUp (LHT Units)
Factory or FieldInstalled Option
A W1 demand will energize compressors 1 and 2. An increased W2 heating demand will energize electric heat. W1 will also energize electric heat during defrost to maintain discharge air temperature. NOTE – L1 and L2 reversing valves are de-energized with a heating demand. The heat pump will heat only, not cool.

Page 26

Cooling Operation

This is a summary of cooling operation. Refer to the sequence of operation provided in the Engineering Handbook or Service Manual for more detail. ATwoStage Thermostat
1 – Economizer With Outdoor Air Suitable Y1 Demand Compressors Off Blower Cooling Low Dampers Modulate Y2 Demand Compressors Off Blower Cooling High Dampers Modulate
NOTE – If dampers are at maximum open for five minutes, compressors are energized and blower stays on cooling high.
Y2 Demand Compressor Full Load Blower Cooling High Dampers Maximum Open
2 – No Economizer or Outdoor Air Not Suitable Y1 Demand Compressor 1 Full Load Blower Cooling Low Dampers Minimum Position Y2 Demand Compressors Both Full Load Blower Cooling High Dampers Minimum Position
BRoom Sensor 1 – Economizer With Outdoor Air Suitable Compressors Off Blower Modulates Dampers Modulate
NOTE – If dampers are at maximum open for five minutes, compressors are energized and the blower modulates.
2 – No Economizer or Outdoor Air Not Suitable Compressors 1 Full Load Blower High Dampers Minimum Position

CThreeStage Thermostat 1 – Economizer With Outdoor Air Suitable Y1 Demand Compressors Off Blower Cooling Medium Dampers Modulate Y2 Demand Compressors Off Blower Cooling High Dampers Modulate
NOTE – If dampers are at maximum open for five minutes, compressors are energized and blower stays on cooling high.
Y2 Demand Compressor 1 Part Load Blower Cooling High Dampers Maximum Open
Y3 Demand Compressor 1 Full Load Blower Cooling High Dampers Maximum Open
2 – No Economizer or Outdoor Air Not Suitable Y1 Demand Compressor 1 Part Load Blower Cooling Low Dampers Minimum Position Y2 Demand Compressor 1 Part Load, Compressor 2 On Blower Cooling Medium Dampers Minimum Position Y3 Demand Compressors Both Full Load Blower Cooling High Dampers Maximum Open
DDefrost Defrost is enabled when outdoor coil temperature is below 35°F. The Unit Controller will cycle in and out of defrost depending on the temperature difference between the outdoor coil and outdoor air temperature. Defrost is also initiated when the accumulated run time with the outdoor coil temperature below 35°F reaches six hours. NOTE – Only one refrigerant circuit will go into defrost at a time

Page 27

Service
The unit should be inspected once a year by a qualified service technician.
CAUTION
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
AFilters
Units are equipped with four 20 X 25 X 2″ filters. Filters should be checked monthly and replaced when necessary with filters of like kind and size. Take note of air flow direction marking on filter frame when reinstalling filters. See FIGURE 25. NOTE – Filters must be U.L.C. certified or equivalent for use in Canada.
REMOVE FILTERS

CBurners (Gas Units)
Periodically examine burner flames for proper appearance during the heating season. Before each heating season examine the burners for any deposits or blockage which may have occurred.
Clean burners as follows:
1 – Turn off both electrical power and gas supply to unit.
2 – Remove burner compartment access panel.
3 – Remove screws securing burner assembly to burner support and remove assembly. See FIGURE 26. Clean as necessary.

GAS VALVE

BURNER BOX ASSEMBLY 240KBTUH SHOWN
BURNER ASSEMBLY SECURED WITH
MULTIPLE SCREWS

PULL TO REMOVE FILTERS

GAS MANIFOLD
FIGURE 26 4 – Locate the ignitor under the left burners. Check ig-
nitor spark gap with appropriately sized twist drills or feeler gauges. See FIGURE 27.
IGNITOR
SPARK GAP SHOULD BE 1/8″
(3mm)

FIGURE 25
BLubrication
All motors are lubricated at the factory. No further lubrication is required.

FIGURE 27

Page 28

5 – Check the alignment of the ignitor and the sensor as shown in FIGURE 28 and TABLE 10.

TABLE 10

Dimension

Unit Btuh Input

Length in. (mm)

Ignitor

Sensor

A

130K

7-3/4 (197)

11 (279)

B

180K

5 (127)

5-1/2 (140)

C

240K

2-1/4 (57)

2-3/4 (70)

6 – Replace burners and screws securing burner.

7 – Replace access panel.

8 – Restore electrical power and gas supply. Follow lighting instructions attached to unit and use inspection port in access panel to check flame.

WARNING
Danger of explosion. Can cause injury or death. Do not overtighten main burner mounting screws. Snug tighten only.
DCombustion Air Inducer (Gas Units)
A combustion air proving switch checks combustion air inducer operation before allowing power to the gas controller. Gas controller will not operate if inducer is obstructed.

Under normal operating conditions, the combustion air inducer wheel should be checked and cleaned prior to the heating season. However, it should be examined periodically during the heating season to establish an ideal cleaning schedule. With power supply disconnected, the condition of the inducer wheel can be determined by looking through the vent opening.
Clean combustion air inducer as follows:
1 – Shut off power supply and gas to unit.
2 – Disconnect pressure switch air tubing from combustion air inducer port.
3 – Remove and retain screws securing combustion air inducer to flue box. Remove vent connector. See FIGURE 29.
4 – Clean inducer wheel blades with a small brush and wipe off any dust from housing. Clean accumulated dust from front of flue box cover.
5 – Return combustion air inducer motor and vent connector to original location and secure with retained screws. It is recommended that the combustion air inducer gasket be replaced during reassembly.
6 – Clean combustion air inlet louvers on heat access panel using a small brush.

IGNITOR
A B C

IGNITOR AND SENSOR POSITION TOP VIEW

SENSOR
A B C

1-3/8″ (35mm)

SIDE VIEW IGNITOR
Gas Flow

SIDE VIEW SENSOR
Gas Flow

13/16″

BURNER BOX
FIGURE 28

1-3/4″ (45mm)
3/8″ (10mm)

Page 29

HEAT EXCHANGER ASSEMBLY
HEAT EXCHANGER
TUBE
COMBUSTION AIR INDUCER
VENT CONNECTOR
GAS VALVE BURNER FIGURE 29
EFlue Passageway and Flue Box (Gas Units) 1 – Remove combustion air inducer assembly as described in section D. 2 – Remove flue box cover. Clean with a wire brush as required. 3 – Clean tubes with a wire brush. 4 – Reassemble the unit. The flue box cover gasket and combustion air inducer gasket should also be replaced during reassembly.

FIndoor Coil
Inspect and clean coil at beginning of each cooling season. Clean using mild detergent or commercial coil cleaner. Flush coil and condensate drain with water taking care not to get insulation, filters and return air ducts wet.
GSupply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated dirt or dust. Turn off power before attempting to remove access panel or to clean blower wheel.
HOutdoor Coil
Clean outdoor coil annually with detergent or commercial coil cleaner and inspect monthly during the cooling season. Access panels are provided on front and back of outdoor section.
JNeedlepoint Bipolar Ionizer
The ionizer was designed for low maintenance. The device should be checked semi-annually to confirm the brushes are clean for maximum output. The ionizer is located on the blower deck. See FIGURE 30.

Page 30

BIPOLAR IONIZER
IONIZER ASSEMBLY

FIGURE 30

UVC ASSEMBLY
UVC LAMP UVC ASSEMBLY

DOOR SWITCH

FIGURE 31 Page 31

ASSEMBLY SECURED WITH 3 SCREWS

KUVC Light
When field-installed, use only UVC Light Kit assembly 106882-01 (21A93) with this appliance.
Factory-Installed UVC Light
When the UVC light is factory installed, the lamp is shipped in a foam sleeve. The lamp is attached to the UVC light assembly on the blower deck. See FIGURE 31. Remove the lamp and install into the UVC light assembly as shown in steps 2 through 11.
Annual Lamp Replacement
WARNING
Personal Burn Hazard. Personal injury may result from hot lamps. During replacement, allow lamp to cool for 10 minutes be fore removing lamp from fixture. The lamp should be replaced every 12 months, as UVC energy production diminishes over time.
1 – Obtain replacement lamp 101087-01 for your germicidal light model.
2 – Disconnect power to the rooftop unit before servicing the UVC kit.
3 – Open the blower access door.
4 – Remove the screw in wire tie from the UVC assembly and disconnect the 4-pin connector from the lamp end.
5 – Remove and retain the (3) screws securing the UVC assembly. Carefully slide the complete UVC assembly out through the blower access door. See FIGURE 31.
6 – Allow 10 minutes before touching the lamps. Then, carefully remove the old lamp from the lamp holder clips.
7 – Wear cotton gloves or use a cotton cloth when handling the new lamp. Place the new lamp in the holder clips of the UVC assembly. Verify that the lamp flange at the connector end is sandwiched between the lamp holder clip and the sheet-metal end stop (see FIGURE 32).
8 – Carefully place the UVC assembly on the blower deck. Line up the mounting holes on the UVC assembly with the mounting holes on the blower deck See FIGURE 31. Use the retained screws provided to attach the UVC assembly in place.
9 – Close the blower access door.
10 – Reconnect power to the rooftop unit.
11 – Open the filter access door and look through the view port in the triangular sheet-metal panel to verify that the UVC light is on.

INSTALL LAMP IN HOLDER CLIPS
UVC Sub-Assembly

BANDS (see Note below)
DETAIL A

SHEET METAL END STOP

LAMP FLANGE

4-PIN CONNECTOR

LAMP

HOLDER CLIPS (2)

NOTE – The bands around the lamp should be evenly spaced as shown in the diagram.

FIGURE 32
If UVC lamp does not come on:
1 – Check Power Wiring: Disconnect 1/4″ QC (quick connects) of the UVC cable near the UVC assembly. With Power ON, use multimeter to test 110-230V at the 1/4″QC quick connects from the control panel.
2 – Check Lamp: Carefully remove the UVC assembly out of the rooftop unit. Use multimeter to test for continuity across each pair of pins at each end of the lamp.
3 – Check Lamp Installation: Make sure that lamp’s pins snap properly into the lamp holder.
LED(s) not illuminated Power status LED not lit–Check that the lamp unit is connected to the proper power source and is wired correctly. Lamp status LED(s) not lit–
1 – Check that lamp 4-pin connectors are properly engaged.
2 – Ohm-check across the lamp pins to check for continuity of lamp filaments (see FIGURE 34).
Troubleshooting charts are provided to aid in determining the cause of any problems encountered (FIGURE 33 and FIGURE 34).
Lamp Disposal
HgLAMP Contains Mercury Manage in accordance with local, state and federal disposal laws. Refer to www. lamprecycle.org or call 800-953-6669.

Page 32

Proper Cleanup Technique in Case of Lamp Breakage
Wear protective gloves, eye wear and mask.
Sweep the broken glass and debris into a plastic bag, seal the bag, and dispose of properly. Contact your local waste management office for proper disposal. Do not use a vacuum cleaner. Do not incinerate.
Maintenance
· For all maintenance, contact a qualified HVAC technician.
· Read the maintenance instructions before opening unit panels.

· Unintended use of the unit or damage to the unit housing may result in the escape of dangerous UVC radiation. UVC radiation may, even in small doses, cause harm to the eyes and skin.
· Do not operate units that are obviously damaged.
· Do not discard the triangular UVC light shield or any barriers with an ultraviolet radiation symbol.
· Do not override the door interlock switch that interrupts power to the UVC light.
· Do not operate the UVC light outside of the unit.

DANGER
Ultraviolet (UVC) Radiation hazard. Any exposure will cause significant eye damage and may cause skin damage. DO NOT look into UVC light source. Access panels must be in place during appliance operation.

UVC LIGHT TROUBLESHOOTING – POWER

UVC LAMP NOT OPERATING

POWER LED

LIT?

NO

YES

CHECK LAMP LEDS

DONE

YES

NO LAMP LEDS
LIT?

USE MULTIMETER TO TEST 110-230V AT
BALLAST INPUT LEADS

CORRECT VOLTAGE PRESENT? NO
YES
CHECK POWER
LEDS

FIRST TURN THE POWER OFF; CHECK THE WIRING
TURN POWER BACK ON

POWER LED YES LIT NOW?
NO GO TO LAMP LED TROUBLESHOOTING
FIGURE 33

REPLACE BALLAST

Page 33

LAMP LEDS NOT LIT

UVC LIGHT TROUBLESHOOTING – LAMP

FIRST TURN THE POWER OFF. BE SURE THAT THE 4-PIN
CONNECTORS FOR ALL THE LAMPS ARE PROPERLY ENGAGE.D

TURN POWER ON; CHECK LAMP LEDS

DETAIL A

CALL LENNOX TECH SUPPORT 1-800-453-6669
NO

DONE

LAMPS BLACK ON
ENDS?
YES NO

YES LAMP LEDS LIT?
CHECK FOR CONTINUITY

TWO PAIR, PIN TO PIN ON EACH PAIR (SEE DETAIL A)
CONTINUITY YES PRESENT?
NO
REPLACE LAMPS; TURN POWER ON

LAMP LEDS

YES

LIT?

NO

BANDS

AROUND LAMP

YES

INTACT?

NO

BANDS

NOTE – CHECK FOR CONTINUITY ON THE SETS OF PINS CLOSEST TOGETHER
CHECK FOR CONTINUITY

DETAIL B

FIGURE 34

Page 34

FieldInstalled Accessories
When field-installing the following accessories, refer to the latest online installation instruction.

Accessory Economizer Outdoor Air Damper Electric Heat Smoke Detector

TABLE 11
Instruction # 507227-XX 506340-XX 507250-XX 506437-XX

Factory Unit Controller Settings
Use the mobile service app to adjust parameters; menu paths are shown in each table. Refer to the Unit Controller manual provided with each unit.
TABLE 12 and TABLE 13 show control options. When applicable, record field- specific information on the label located inside the compressor access panel.
When field installing optional kits and accessories, the Unit Controller must be configured to identify the option before it will function. Refer to FIGURE 35 and FIGURE 36 to determine whether the Unit Controller configuration I.D. must change. To configure the option, use RTU MENU > SETUP > INSTALL menu path. Press NEXT until CONFIGURATION ID 1 or 2 appears depending on the option installed. Change the appropriate character in the configuration I.D. For example, when an economizer is installed using a single enthalpy sensor, change
configuration I.D. 1, the second character, to “S”.

TABLE 12 58103701
Units With LonTalk Settings Use menu RTU Menu > Network Integration > Network Setup Wizard > Set “LONTALK”
TABLE 13 58103801
Units With BACnet Settings RTU Menu > Network Integration > Network Setup Wizard > BACnet MS/TP > See BACnet MAC Address BACNET MAC ADDRESS:
Units With Room Sensor, CPC/LSE Gateway Settings RTU Menu > Network Integration > Network Setup Wizard > SBUS > Set SBUS Address LCONN ADDRESS:

Page 35

Configuration ID 1
1 2 3 4 5 6 7 8

Humiditrol [1] Not Installed = N Humiditrol Installed = H
Unconfigured = U
Economizer [2] Not Installed = N Motorized Outdoor Air
Damper Only = M Economizer – Temperature = T
Economizer Global = G Economizer – Single Enthalpy = S
Economizer – Dual Enthalpy = D Unconfigured = U
Power Exhaust [3] Not Installed = N Single-Stage = S
Dual-Stage = D Unconfigured = U
Power Exhaust Control 4] Not Installed = N Damper Position = A A34 Pressure Sensor = C

[8] Outdoor Air Velocity Control
N = Not applicable (for future use) L = Outdoor Air Control Installed
with A24 Sensor set for low range. M = Outdoor Air Control Installed with
A24 Sensor set for medium range. H = Outdoor Air Control Installed with
A24 Sensor set for high range.
[7] System Blower Sub-type
N = Not Applicable. B = VFD Belt Drive Blower (MODBUS). H = Direct Drive Blower (MODBUS). L = ECM Direct Drive Blower (PWM). U = Unconfigured. D = Direct Drive Blower.
[6] Blower Variable Frequency Drive Bypass
N = Not Installed A = Automatic Bypass M = Manual Bypass U = Electronic Bypass Field Unconfigured [5] Network Module
N = Not Installed L = LonTalk (Lennox)

FIGURE 35

Page 36

Configuration ID 2

1 2 3 4 5 6 7 8 9 10

Air Flow Proving [1] Switch (S52)
Not Installed = N Installed on M4 = C Installed on DDC
Controller = D
Dirty Filter Switch (S27) [2] Not Installed = N Installed on M4 = C Installed on DDC Controller = D
Overflow Switch (S149 / S179) [3] Not Installed = N Installed = Y
Reserved [4] Reserved = N

[10] Reserved
N = Reserved
[9] Electric Heat (Field-Installed)
N = Not Installed Y = Installed
[8] Load Shedding
N = Not Installed G = Global (P297 – pin 9) 2 = Installed on DI-2 3 = Installed on DI-3
[7] Zone Bypass Damper
N = Not Installed Y = Installed

Phase/Voltage Detection * [5] N = Not Installed
1 = Enabled Internal (Lennox)
2 = External (A42) Phase Detection on DI-2
3 = External (A42) Phase Detection on DI-3

• When phase detection and voltage monitoring is enabled and wired incorrectly, the system will go into demand hold status and restart after six minutes.

[6] IAQ Options
N = Not Installed
1 = UV Lamp Installed
2 = Bipolar Ionizer Installed
3 = UV Lamp and Bipolar Ionizer Installed
4 = Wireless IAQ Filter Sensors
5 = UV Lamp and Wireless IAQ Filter Sensors Installed
6 = Bipolar Ionizer and Wireless IAQ Filter Sensors Installed
7 = UV Lamp and Bipolar Ionizer and Wireless IAQ Filter Sensors Installed

FIGURE 36

Page 37

START-UP REPORT
Job Name:___

Inspections and Checks

Store No.___Start-Up Date:__

Damage?

Yes No

R22 R410A

Address:_____

If yes, reported to:____

City:__State:__ Start-Up Contractor:____ Technician: Model No.: Serial No.:____ RTU No.:____ Catalog No.:__

Verify factory and field-installed accessories.
Check electrical connections. Tighten if necessary.
Supply voltage: L1-L2__L1-L3L2-L3
If unit contains a 208-230/240 volt transformer: Check primary transformer tap Transformer secondary voltage: __

Cooling Checks

Compressor Rotation Ambient Temp.____Return Air Temp.____ Supply Air Temp.____

Compressor Amps

Compressor Volts

Pressures Condenser Fan Amps CC Heater Amps

L1

L2

L3 L1-L2 L1-L3 L2-L3 Disch. Suct. L1

L2

L3

L1

1

2

3

4

Blower Checks

Pulley/Belt Alignment Set Screws Tight

Blower Rotation Belt Tension

Nameplate Amps:_ Volts:___

Motor

Amps L1 L2 L3_____

Volts L1-L2 L1-L3 L2-L3_____

Heating Checks – Gas

Fuel type: Nat. LP Inlet Pressure:_in. w.c. Return Air Temp.:__ Supply Air Temp.:_ Altitude:____ Primary Limits Operate:

CO2%: Gas Valve GV1 GV2

Manifold Pressure

Low Fire

High Fire

Control Type

Heating Checks – Electric

Return Air Temp.:__ Supply Air Temp.:__ Limits Operate:

Amps

L1 L2 L3

L1 L2 L3

1

10

2

11

3

12

4

13

5

14

6

15

7

16

8

17

9

18

Accessory Checks

Power Exhaust Amps

1 _____ 2 ____ None

Min. Pos.

Economizer Operation Motor travel full open/close

Page 38

References

• Lamp Recycle – Environmental Responsiblility Starts Here

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>