precedent FIAPWRX302 Series Packaged Rooftop Units Power Exhaust Kit Installation Guide

precedent FIAPWRX302 Series Packaged Rooftop Units Power Exhaust Kit

MODELS

**⚠ 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:

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

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

Indicates a situation that could result in equipment or property-damage only accidents.

Important Environmental Concerns

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants.

Important Responsible Refrigerant Practices

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified according to local rules. For the USA, the Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

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.

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.

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

• Updated the Used With information for Model Numbers on front cover.
• Added a new section for Weights and Dimensions in Wiring Installation – FIAPWRX03 chapter.
• Updated wiring drawing in Wiring Installation chapter.

General Information – FIAPWRX02

Power exhaust is designed for downflow applications1. If the installation is for horizontal duct connections, the power exhaust may be mounted on the horizontal return duct. The installer is responsible for the installation. An economizer or motorized damper must be installed and functional before attempting to install the power exhaust.
The power exhaust can be turned ON at infinite fresh air damper settings depending on how the unit is configured.

Inspection

1. Unpack all components of the power exhaust kit.
2. Remove hardware package from power exhaust assembly.
3. Check carefully for shipping damage. If any damage is found, report it immediately, and file a claim against the transportation company

Hazardous Voltage w/Capacitors! Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

Parts List

• One (1) Power Exhaust Assembly
• One (1) AB Power Exhaust Hood (three pieces)
• One (1) Template Drawing
• One (1) Gasket
• One (1) Sealant; Silicone Rubber
• 13 Screw; 10-16 x 0.50
• 12 Screw; #10 – 0.62 (Self tapping)
• Two (2) Bushing
• One (1) Edge Protector
• One (1) Label
• Five (5) Quick Splice; 18 ga. (Red)
• Three (3) Quick Splice; 14 ga. (Blue)
• Eight (8) Wire Tie; Pop-In
• Two (2) Wire Tie

Installation – FIAPWRX02

Pre-Installation

1. Open and lock unit disconnect before attempting to install this accessory.
2. Remove the filter access panel from front side of the unit.
3. Remove the compressor access panel from front side of the unit.
4. Remove the return air panel from back side of the unit

Standard Economizer

Use the template for the return air panel provided in the hardware kit to locate positions to drill holes and cut required new opening.
Note: Use template that corresponds to unit/return panel size. Do not cut a hole for units that have a low leak economizer installed.

Recommended Procedure

Place the template into position for drilling and cutting, and secure it with pieces of duct tape (field supplied).
Important: Alignment of the template is critical. Instructions for alignment and cutting are printed on the template.

1. rill three 1/8-inch holes in the template and panel for engagement holes. Refer to template.
   Figure 1. Power exhaust hood installation for standard economizer
   
   

2. Drill four holes through the template and panel for saw cutting starter holes. Cut through the template and panel at the same time to create the new opening; discard the scrap metal.

3. Install edge protector (supplied) along the down-facing top edge of the new cutout. See Figure 1.

4. Assemble required powered exhaust hood with screws provided as shown in Figure 1.

5. Mount hood to duct cover with four screws. See Figure 1.

6. Insert 1-inch bushing into hood. See Figure 1.

7. Partially insert screws into the three engagement holes drilled in the duct cover. Leave approximately 1/8-inch gap between the screw head and duct cover. These will act as alignment hangers. See Figure 1.
   Important: Remove the return duct block off. Refer to Figure 2.
   Figure 2. Duct block off
   

8. Install duct cover back on unit.

9. Apply gasket to face of power exhaust assembly. See Figure 3.
   Figure 3. Gasket to power exhaust assembly
   
   

10. Pull wiring harness out from power exhaust assembly and insert through bushing in the hood.

11. Lift power exhaust assembly up and align slots in the top flange with screws in duct cover.

12. Secure the three screws.

13. Use the seven clearance holes on the perimeter flange and secure to the duct panel with seven self drilling screws.

14. Route the wire harness along the top edge of the economizer and secure with pop-in wire ties. See Figure 4.
    Figure 4. Wire harness routing
    

15. For all units, route the wires for the powered exhaust into the return control box located in the return section of the unit. Refer to Figure 5.
    Figure 5. Return control box location
    

Figure 6. Return control box view

Note: See wiring instructions for wire routing.

Hazardous Voltage w/Capacitors!

Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

Low Leak Economizer

_Figure 7. Low leak install

_

1. Remove barometric relief hood (if installed).
2. Remove aluminum barometric relief damper and discard.
3. Route wire through 1-inch hole to control module.
4. Locate dimples, then hang powered exhaust on three top holes using self-drilling screws. The upper hood may need  to be removed to access dimples.
5. Using self-drilling screws, attach powered exhaust perimeter to facing.
6. Take up slack in wire and route clear of gears.

Wiring Installation – FIAPWRX02

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.

Wire Damage!
Failure to follow instructions below could result in damaged wires.
Use provided wire ties to make sure wires are secured and protected from sharp edges and hot surfaces

Figure 8. Wiring
POWER WIRING

CONTROL WIRING

NOTES:

MATING CONNECTOR PPM89 IS LOCATED IN THE RETURN ENCLOSURE PANEL CONTROL WIRING
460V/575V

Symbio™ Controls Wiring

Hazardous Voltage w/Capacitors!

Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

Refer to controls wiring diagram ( Figure 8 ) for connections.

1. Route controls wiring (black and red) and connector J6 along the top of the return control box and down the right side and enter enclosure through the top hole.
2. Connect wire connector J6 to P6 on the fresh air options module in the return control box (brown connector). Secure wiring with pop-in wire ties.
3. After installation is complete, the Symbio™ 700 UC configuration will need to be updated to enable this installed feature.

Power Wiring

Hazardous Voltage w/Capacitors! Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

Refer to the power diagrams for connections ( Figure 8 ).
Important: Use provided wire ties to secure and protect wires from sharp edges, rotating parts, and hot surfaces.

1. Route the high voltage wiring (brown and orange) and connector PPF89 along the top of the return control box and down the right side and enter enclosure through the bottom wire hole.
2. Connect PPF89 to PPM89 (purple connector) on the fresh air options module and secure wires with pop-in wire ties.

Close Out

Hazardous Voltage w/Capacitors! Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

1. Open and lock unit disconnect.
2. Replace the filter access panel.
3. Place the 1-inch x 3-inch label (power exhaust installed) next to the main unit wiring diagram inside the compressor  access panel.
4. Check all seams on the power exhaust and confirm they are all sealed water-tight with provided silicone rubber sealant.
5. Close the unit disconnect switch.

General Information – FIAPWRX03

Power exhaust is designed for downflow applications. For horizontal applications, the power exhaust may be mounted on the horizontal return duct. It is the responsibility of the installer’s 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.

Parts List

Figure 9. Major power exhaust components

Components not shown

Installation – FIAPWRX03

Hazardous Service Procedures! Failure to follow instructions could result in death or serious injury. The procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, 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 filter access panel from front side of the unit.
3. Remove the horizontal duct cover.
4. Remove the economizer duct block off.

Internal Block off Gasket Seals

The following are two types of economizers:

1. Standard economizer: Attach one gasket (9) to the base, aligned with the economizer return air damper (RAD) bracket. See Figure 10.
   Figure 10. Attach gasket to base and block off panel
   
   

2. Low leak economizer: Align gasket with the return air damper flange. See Figure 11.
   Figure 11. Align gasket with RAD flange
   

3. 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 10.

Comparative Enthalpy Install

1. Install humidity and temperature sensors as required. See Figure 12, p. 11.
   Figure 12. Install comparative enthalpy and bushing
   
   

2. Install bushing in internal block off panel. See Figure 12.

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 fresh air options module as described in later steps).

Block off Assembly

1. Install internal base duct block off using two screws.
   Figure 13. Install base duct block off panel
   

2. Attach internal block off (4, 5 and 7) using six screws.
   Figure 14. Block off assembly
   
   

3. Install internal block off assembly using four screws to secure to side flanges of return opening.
   Figure 15. Secure internal block off assembly

Power Exhaust Assembly

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
   Figure 16. Remove screw and attach gasket
   
   

3. Install support and alignment bracket to base rail below return duct opening with three screws (1/4 x 5/8).
   Figure 17. Install support and alignment bracket
   
   

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

5. Uncoil wires and route through grommet in internal block off. (Feed terminals through bushing one at a time).
   The following are two types of economizers:

6. Standard economizer: Insert wire tie into closest hole in the economizer support channel and secure the power and control wires. See Figure 18.
   Figure 18. Standard economizer wire routing
   
   

7. Low leak economizer: Route wiring along the bottom of the return air damper and secure the power and control wire. See Figure 19.
   Figure 19. Low leak economizer wire routing
   
   

8. Attach power exhaust to side of unit using 10 screws.
   Figure 20. Attach power exhaust to side of unit
   
   

9. Using 10 screws, attach horizontal return block off to unit rear panel.
   Figure 21. Attach horizontal return block off
   
   The following are two types of economizers:
   

10. 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 22.
    Figure 22. Route wires along standard economizer support bracket
    
    11. Low leak economizer: Route two power and two control wires down the top center block off panel and secure wires with the four pop-in wire ties that will already be installed across the bottom of the return air damper. See Figure 23, p. 14.

Figure 23. Route wires along economizer support bracket

Wiring Installation – FIAPWRX03

Hazardous Voltage with Capacitors!

Failure to follow instructions below could result in death or serious injury. Disconnect all electric power, including remote disconnects and wait for DC capacitors to discharge before servicing. Refer to the manufacturer’s recommendations for proper discharge time as DC bus capacitors retain hazardous voltages after input power has been disconnected. 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 before touching any internal components.

Important: Use provided wire ties to secure and protect wires from sharp edges, rotating parts, and hot surfaces.

Power Wiring

1. Using the wire routing guide shown in Figure 24, route the high voltage wiring (brown and orange wires) and connector PPF89 along the top of the return control box and down the right side and enter enclosure through bottom wire hole. Connect PPF89 to PPM89 (purple connector) on the fresh air options module and secure wires with pop-in wire ties.
2. Ensure that all wires are protected from damage by moving parts. Secure the wires with wire ties (provided).
3. After installation is complete, the Symbio™ 700 UC configuration will need to be updated to enable this
   installed feature.

Figure 24. Power connection to return control box – all units

Control Wiring

Units with Standard and Low Leak Economizer

Note : Refer to Figure 25 for connections.
Connect power exhaust wire connector J6 to P6 on the fresh air options module in the return control box (brown connector).

1. Route controls wiring (black and red wires) and connector J6 along the top of the return control box and down the right side and enter enclosure through top hole.
2. Connect wire connector J6 to P6 on the fresh air options module in the return control box (brown connector). Secure wiring with pop-in wire ties.
3. After installation is complete, the Symbio™ 700 UC configuration will need to be updated to enable this installed feature.

Figure 25. Control wiring diagram

NOTES:

1. MATING CONNECTOR PPM89 IS LOCATED IN THE RETURN ENCLOSURE PANEL
2. 460V/575V

Power Exhaust Settings with Single Zone VAV and Multi-Speed Units

Set power exhaust setpoint with the fan at maximum speed. Maximum speed can be obtained in full cooling or any heating modes.

Weights and Dimensions

Table 1. Weights and dimensions

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-SVN236B-EN 15 Apr 2023
Supersedes ACC-SVN236A-EN (Aug 2022)

References

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

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