Trane BAYPWRX300 Power Exhaust Kit Foundation Packaged Rooftop Units Instruction Manual

Installation Instructions
Power Exhaust Kit
Foundation™ Packaged Rooftop Units 15 to 25 Tons Model Number:
*BAYPWRX300 BAYPWRX301* BAYPWRX302*
Used With:
G/ECC180-300A3 G/ECC180-300A4 G/ECC180-300AW
ACC-SVN157E-EN**

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.

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. Indicates a potentially hazardous
CAUTION
situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.
NOTICE
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-including industry replacements for CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs.
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  efrigerants 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 Labeling 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.

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.

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

• Model number updates in Used With information.
• Removed CV unit information from Power Wiring section.

General Information

Power exhaust is designed for downflow applications. For horizontal applications, the power exhaust may be mounted onthe horizontal return duct. However, it is the  installer’s responsibility to determine how to complete such installation. An economizer must be installed and functional before attempting to install the power exhaust.

Inspection

1. Unpack all components of the kit.
2. Check carefully for shipping damage. If any damage is found, report it immediately, and file a claim against the transportation company.
3.  Visually inspect the components for shipping damage as soon as possible after delivery, before it is stored. Concealed damage must be reported within 15 days.
4.  If concealed damage is discovered, stop unpacking the shipment.
5.  Do not remove damaged material from the receiving location. Take photos of the damage, if possible. The owner must provide reasonable evidence that the damage did not occur after delivery.
6.  Notify the carrier’s terminal of damage immediately by phone and by mail. Request an immediate joint inspection of the damage by the carrier and the consignee.
   Note: Do not attempt to repair any damaged parts until the parts are inspected by the carrier’s representative.

Note: The power exhaust assembly is designed to work with either the return duct opening farthest from the evaporator coil or the alternate return duct opening (closest to the evaporator coil). Items used only on return duct opening farthest from the evaporator coil are designated with *. Items used only on the alternate duct configuration are designated with . All other items are common to both configurations.
Components not Shown:
Description**
Screws, ¼ x 20 x 5/8
Screws, #10 x 14 x 3/4
Wire Tie, 7.78 in.
Wire Tie, 11.0 in.
Bushing, 0.94-in. ID
Bushing, 0.56-in. ID
1-in. x 3-in. Power Exhaust Installed Label

Installation

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.

1. Open and lock unit disconnect before attempting to install this accessory.
2. Remove the supply fan and filter access panels from front side of the unit.
3. Remove horizontal duct cover.
4. Remove economizer duct block-off.

Internal Block-Off Gasket Seals
Standard Economizer: Attach one gasket (9) to the base, aligned with the economizer Return Air Damper (RAD) bracket. See Figure 3.

Low Leak Economizer: Align gasket so it is centered with the screw that secures the return air damper to the return opening flange. See Figure 4.

Cut one piece of gasket (9) to a length of 4.3 inch and attach to (4) leaving a gap of 0.5 inch from face A. See Figure 3.
Comparative Enthalpy
Units with Standard Economizer Control Option

1. Install humidity and temperature sensors as required. See Figure 5, p. 7.
2. Install bushing in internal block-off panel. See Figure 5.
3. Connect wires to humidity sensor and route wires through bushing. Wire tie leads to block-off to provide strain relief. (Wires to be routed with power exhaust leads back to the RTEM-EM as described in later steps).

Comparative Enthalpy
Units with Low Leak Economizer Control Option
NOTICE
Electrostatic Discharge!
Electrostatic discharge can short equipment circuitry.
Ensure that you are properly grounded before handling sensitive electronic equipment.

1. Set DIP switch setting on humidity/temperature sensor to return air (RA).
2. Install RA sensor on to block-off panel (5). See Figure 6.
3. Insert bushing into hole provided on block-off panel (5). See Figure 6.
4. Connect wire to RA sensor and route wires through bushing. Secure wires using the pop-in wire ties provided with the enthalpy kit along the bottom flange of the fresh air damper to the controller. (Wires will NOT be routed with the power exhaust wires to the economizer controller as described in later steps).

Block-Off Assembly
when Using the Return Duct Opening Farthest from the Evaporator Coil

1. Install internal base duct block-off using two screws.
2. Attach internal block-off (4, 5 and 7) using six screws.
3. Install internal block-off assembly using four screws to secure to side flanges of return opening.

Block-Off Assembly
When Using the Return Duct Opening Closest to The Evaporator Coil

1. Attach right and center internal block-off (4 and 5) using three screws to build right block-off assembly. Attach alternate (3) and (6) using three screws to build left blockoff assembly.
2. Insert left internal block-off assembly – parts 3 and 6 – in unit.
3. Secure left block-off assembly to RAD bracket for standard economizer or to the return damper flange for low leak economizer, using two screws.
4. Using four screws, secure right block-off assembly – parts (4) and (5) – to side flanges of return opening and left blockoff assembly (6).

Power Exhaust Assembly
(Same for Both Return Duct Openings)

1. Remove center screw at bottom of rear panel duct opening.

2. Attach gasket (11) to unit back panel. Start gasket below the return horizontal duct opening, centered on the opening and aligned with the flange at the base rail. Route gasket to cover holes and dimples along sides and top of the duct opening. Gasket should be one continuous piece overlapping 1-inch at bottom center.

3. Install support and alignment bracket to base rail below return duct opening with three screws (1/4 x 5/8).

4. Set power exhaust housing adjacent to return duct opening.

5. Uncoil wires and route through grommet in internal blockoff.
   Feed terminals through bushing one at a time.
   Standard economizer: Insert wire tie into closest hole in the economizer support channel and secure the power and control wires. See Figure 16.
   Low leak economizer: Insert wire tie into the side of the enclosure towards the top of the fresh air damper and secure the power and control wire. See Figure 17.

6. Attach power exhaust to side of unit using 10 screws.

7. Using 10 screws, attach horizontal return block-off to unit rear panel.

Standard economizer: Continue to route two power and two control wires (with comparative enthalpy sensor wiring if present) along economizer support channel and secure with four pop-in wire ties. See Figure 17.

Low leak economizer: Remove tape covering pop-in wire tie holes in the top center block-off panel and insert provided popin wire ties. Continue to route two power and two control wires down the top center block-off panel and secure wires with the four pop-in wire ties. See Figure 21, p. 11.

Wiring Installation

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.
Important: Use provided wire ties to make sure wires are secured and protected from sharp edges, rotating parts, and hot surfaces.
Power Wiring
On units with a factory installed variable frequency drive (VFD), route the long, dual, high-voltage wires to the VFTB1 located inside the VFD panel (see Figure 22). Bundle any excess wire in the corner near the access-door opening and secure into place.

Control Wiring

Units with a Standard Economizer
Note: Refer to Figure 25, p. 13 for connections.
Connect power exhaust PPF7 plug, wires #157A and 158A, to EXF/GND on actuator module.

Units with a Low Leak Economizer

1. Disconnect wire 157A from 157B, and wire 158A from W16. Wires 157A and 158A are only used on the Standard Economizer.
2. Connect wire W16 to LTB2-2 located next to the JADE controller.
3. Connect wire 157B to wire 157C which is connected to EXH1 on the economizer controller.

Figure 25. Control wiring diagram

Unit Power Exhaust Operation and Settings

Standard Economizer
The power exhaust setpoint (point at which the power exhaust is turned on) is adjustable from 0% to 100% economizer damper outside air setting, corresponding to the setting of the exhaust setpoint potentiometer on the RTEM-EM. The power exhaust is turned on when the indoor blower is running and the damper position is greater than the power exhaust setpoint. See Figure 23, p. 12.
Low Leak Economizer
The power exhaust setpoint (point at which the power exhaust is turned on) is adjustable from 0% to 100% economizer damper outside air setting, corresponding to the setting of the EXH1 SET value in the SETPOINTS menu in the JADE controller. With 2-speed fan units EXH1 L (low speed fan) and EXH1 H (high speed fan) settings are required.See Figure 24, p. 12.
The JADE display will display EXH1 OUT as ON when the power exhaust is turned on. Power exhaust is turned on when the damper position is greater than the power exhaust setpoint.
Final Installation Steps

1. Replace supply fan access panel.
2. Replace filter access panel.
3. Close unit disconnect, then place the thermostat fan selector in the Fan ON position, and the Heat/Cool selector in the OFF position. This places the damper in the minimum ventilation position.

Trane and American Standard create comfortable, energy efficient indoor environments for commercial and residential applications.
For more information, please visit trane.com or americanstandardair.com.
Trane and American Standard have a policy of continuous product and product data improvement and reserve the right to change design and specifications without notice. We are committed to using environmentally conscious print practices. ACC-SVN157E-EN 03 Dec 2022 Supersedes ACC-SVN157D-EN (Apr 2020) ©2022

References

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

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