Installation Instructions

Warnings, Cautions, and Notices

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

The three types of advisories are defined as follows:

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

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.

R-454B Flammable A2L Refrigerant!

Failure to use proper equipment or components as described below could result in equipment failure, and possibly fire, which could result in death, serious injury, or equipment damage. The equipment described in this manual uses R-454B refrigerant which is flammable (A2L). Use ONLY R-454B rated service equipment and components. For specific handling concerns with R-454B, contact your local representative.

Cancer and Reproductive Harm!

This product can expose you to chemicals including lead and bisphenol A (BPA), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

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 Installation section with Option Board Addressing and Symbio 700™ configuration.
• Revised Installation chapter to add A.0 Cabinet and A2L information.
• Updated Temperature Rise Data table.
• Updated Weights and Center of Gravity chapter.
• Updated cabinet sizes listed for WSK120.
• Updated tables in General information chapter.

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.

Important: Confirm that the available power supply and the unit nameplate comply with the heater nameplate model number being installed.

Notes: Discharge air sensing kit is required for proper simultaneous all heating operation with all heat pump units.

• FIADAST0003 – B0 Cabinet
• FIADAST0005 – C0 Cabinet
• FIADAST0008 – D0/D1 Cabinet

Table 1. Cabinet matrix

(a) A cabinet size change was made in 2025. Please verify the cabinet size by checking model digits 7 and 39 to 40. WSK120A is C.0 cabinet; WSK120B is B.0 cabinet.

Table 2. Heaters – 3 to 5 tons

Table 2. Heaters – 3 to 5 tons (continued)

Table 3. Heaters – 6 to 12.5 tons

Table 3. Heaters – 6 to 12.5 tons (continued)

Table 4. Heaters – 12.5 to 25 tons

Precedent A.0 Cabinet

Digit 39 = A

1. Remove heater compartment access panel and unit control box access panel.
2. Remove insulation to expose perimeter of removable panel in the vestibule panel.
3. Clip or cut the retaining tabs around the perimeter of the removable panel.
4. Remove the panel.

Figure 1. A.0 heater: A diagram showing the internal components of an A.0 electric heater assembly, including heating elements, wiring terminals, and mounting points.

5. Check the opening in the vestibule panel. Remove any metal burrs or slivers that could damage or pinch the heater elements resulting in a short circuit when elements are installed in the opening.
6. The electric heater element assembly has BOTTOM stamped in the mounting panel to identify the proper position for mounting.
7. Slide heater assembly along guide rails until heater is fully seated in opening.
8. Secure the electric heater element assembly with the necessary number of screws.
9. Slide the electric heater control panel/access door assembly in until the rear edge engages with retaining clips. Secure the control panel with screws at the top against the vestibule panel and against the indoor divider panel.
10. To install the hinged door stops, loosen one existing screw from the upper left side of the electric heater compartment opening. Position each door stop with outer tab flush against center post and secure each door stop with one or two screws.
11. Wire control voltage harness to Symbio™ 700 using the supplied controls harness.
• Route wires from heater assembly to Symbio 700 in main control box. See Figure 2 below for wire routing paths.

Figure 2. Control wiring: Two images showing the internal wiring of the electric heater control section. The top image shows a general view of the control panel with various components and terminal blocks. The bottom image shows a closer view of the lower section with multiple contactors and wiring connections.

12. After heater is installed and before applying power:
• Verify heating elements are not damaged or pinched.
• Verify heating elements are not short circuited to each other or to the heater frame or equipment cabinet.
• Test every heater element with meter and verify heater element terminals are electrically isolated from cabinet and ground (infinite resistance).
• On downflow units with or without duct work installed or horizontal units without ductwork installed, remove horizontal supply cover and carefully inspect elements after installation for damage or proximity to supporting structure or cabinet. At least 1/4-inch clearance is required around electric heater coils.
• Check tightness of all terminal connections, clamps, screws, etc., as these may have become loose in shipment.
• Tighten all electrical connections after equipment has been in operation and components have reached operating temperature.
13. Install the magnets into the door. The magnets should lock into place once installed.
14. Close electric heater control panel access door, replace heat section access panel, and unit control box access panel.
15. Carefully replace horizontal supply cover. Verify gasketing is not torn or missing. Gasket must make a watertight seal.
16. Scratch out the square on unit nameplate showing heater model installed in unit.

Precedent B.0/C.0 Cabinet

Digit 39 = B/C

WARNING Hazardous Voltage w/Capacitors! Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

1. Remove heater compartment access panel and unit control box access panel. See Figure 3.

Figure 3. Control covers and access panels: A diagram illustrating the exterior of the unit, highlighting the locations of the Horizontal Supply Cover, Heat Section Access Panel, and Control Box Access Panel.

Note: On downflow units with or without duct work installed or horizontal units without ductwork installed, remove horizontal supply cover from the rear of the heater compartment.

2. In the vestibule panel, remove the insulation to expose the perimeter of the removable panel. See Figure 4.
3. Clip the retaining tabs around the perimeter of the removable panel.
4. Remove the panel.

Figure 4. Heater element mounting: Diagrams showing how to prepare the panel for heater element installation, indicating where to trim or remove parts of the opening.

5. Check the opening in the vestibule panel. Remove any metal burrs or slivers that could damage or pinch the heater elements resulting in a short circuit when elements are installed in the opening.
6. The electric heater element assembly has BOTTOM stamped in the mounting panel to identify the proper position for mounting.
7. Slide heater assembly along guide rails until heater is fully seated in opening.

Figure 5. Electric heater assembly: An image of the electric heater assembly itself, showing the heating elements mounted on a frame with electrical connections.

8. Secure the electric heater element assembly with the necessary amount of screws.
9. Remove two screws in base pan of unit.
10. Slide the electric heater control box assembly into unit. Secure with two screws in base (removed in step 9). One screw into divider panel and two screws into electric heat vestibule.

Figure 6. Electric heater control panel/access door assembly: An illustration of the control panel and access door assembly, showing its components and how it attaches.

11. To install the hinged door stops, loosen one existing screw from the upper left side of the electric heater compartment opening. Position each door stop with outer tab flush against center post and secure each door stop with one or two screws.

Figure 7. Hinged door stops: A close-up diagram showing the detail of a hinged door stop mechanism and its attachment points.

12. Wire control voltage to indoor options module using the suppled harness. Route wires from heater assembly to indoor options module in main control box. See Figure 20 for indoor option module location. Stage 1 to J6 and stage 2 (if installed) to J7. Refer to included schematic and main unit sheet 5 for remaining balance of circuit.

NOTICE Use Copper Conductors Only! Failure to use copper conductors could result in equipment damage as the equipment was not designed or qualified to accept other types of conductors.

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.

13. After the heater is installed and before applying power, verify the following:
• Heating elements are not damaged or pinched.
• Heating elements are not short circuited to each other or to the heater frame or equipment cabinet.
• Test every heater element with ohmmeter and verify heater element terminals are electrically isolated from cabinet and ground (infinite resistance).
• On downflow units with or without duct work installed or horizontal units without ductwork installed, remove horizontal supply cover and carefully inspect elements after installation for damage or proximity to supporting structure or cabinet.
• At least 1/4-inch clearance is required around electric heater coils.
• Check tightness of all terminal connections, clamps, screws, etc.
• Tighten all electrical connections after equipment has been in operation and components have reached operating temperature.
14. Install the magnets into the door. The magnets should lock into place once installed.
15. Close electric heater control panel access door, replace heat section access panel, and unit control box access panel.

Precedent D.0/D.1 Cabinet

Digit 39 = D

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.

NOTICE Use Copper Conductors Only! Failure to use copper conductors could result in equipment damage as the equipment was not designed or qualified to accept other types of conductors.

WARNING Proper Field Wiring and Grounding Required! Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state/national electrical codes.

1. To access the electric heat section, remove the four screws securing the heat section access panel. See Figure 8.

Figure 8. Heat access panel: A diagram of the heat section access panel, indicating screws to be removed.

2. Remove five screws securing the bottom through-the-base electrical (TBUE) panel. See Figure 9.

Figure 9. Lower TBUE panel: A diagram of the bottom through-the-base electrical (TBUE) panel, showing screw locations.

3. Remove the bulkhead post by removing screws along the exterior of the post, at the roof, base, and behind the access panel near the top of the unit as shown in Figure 10 below.

Figure 10. Bulkhead post: Diagrams illustrating the removal of a bulkhead post, showing screw locations at the roof, base, and access panel.

4. Once the post is removed, there is clear access to the heat compartment for installation of the FIA electric heater kit.
5. Before installing the heater(s) into the unit, complete the following steps:
• Identify the top of each heater element by using the airflow direction label on the terminal plate. When oriented correctly, the airflow arrow will point down. Refer to the Table 5 for heater identification based on overall kit kW.

If the heater is a dual heater, adjoin the two heaters end to end with the provided screws in eight locations (four screws on each side). Heater 1 has the faceplate installed.

Note: For W/G 150–300 models: Heater 1 has 140°F/180°F limits and Heater 2 has 150°F/180°F limits installed.

Figure 11. Dual heater connection: A diagram showing how two heater elements are joined end-to-end, with screw locations indicated.

Figure 12. Rear wire chase connection: A diagram showing the rear connection of a wire chase, with screw locations.

6. Attach the two piece wire chase together using two screws.

Figure 13. Wire chase assembly: An illustration of the two-piece wire chase being assembled.

Figure 14. Wire chase connection: Diagrams showing how the wire chase attaches to the heater assembly, with screw locations.

7. Attach the wire chase to the heater assembly. Verify the wire harness is inside the wire chase and not trapped between the chase and heater side channels. This step will require:
• Two screws to the terminal plate.
• One screw in the center on the bottom of the wire chase.
• One screw on the back heater.
8. Connect the wire harness to the correct terminals on Heater 2 (reference the wiring schematic on the hinged door inside the kit), and cinch the wire tie on the back wire chase. Verify the wires are not trapped between the heater assembly and the wire chase and cinch the front wire tie at the front bushing.
9. Connect the wire harness to the correct terminals on Heater 1 (reference the wiring schematic on the hinged door inside the kit). The heater assembly is now ready to be installed into the unit.

Important: Torque all terminal connections to 15 to 20 in-lbs.

Figure 15. Heater element mounting: Diagrams showing the heater opening in the insulation and sheet metal, indicating where to trim and remove parts.

10. Trim away the heater opening perforation in the insulation to expose the removable portion of the sheet metal.
11. Clip the sheet metal tabs to remove the sheet metal to allow the heater assembly to be installed into the unit.
12. Slide the heater assembly into the unit by tipping the back of the assembly up slightly and engaging the heater side brackets between the guide rails. Verify the free end of the wire harness is away from the heater opening as the assembly is guided into place.
13. Secure the heater assembly to the heater vestibule using eight screws.

Figure 16. Heater front panel: A diagram of the heater front panel, showing screw locations for securing the assembly.

14. Install the magnet bracket in the unit at the top of the heat section with two screws.

Figure 17. Magnet bracket assembly: A diagram showing the installation of a magnet bracket at the top of the heat section.

15. Install the heater control panel in the unit using four screws. There are holes in the insulation to assist in locating the screw hole locations.

Figure 18. Electric heat control panel mounting: A diagram showing the installation of the electric heat control panel, with screw locations.

16. Install the heater terminal block plate to the unit base rail and heater control panel.
17. Replace horizontal supply cover. Be careful when replacing cover and verify gasketing is not torn or missing. Gasket must make a watertight seal.
18. Scratch out the square on unit nameplate showing heater model installed in unit.

Figure 19. Terminal plate mounting: A diagram showing the terminal plate and its connections.

Figure 20. Indoor options access: An illustration showing the location of the Indoor Options Module within the unit.

22. Install the bulkhead post.
23. Install lower TBUE panel to the base.

Figure 21. Lower TBUE panel: A diagram of the lower TBUE panel, showing screw locations for installation.

24. Install the heater door assembly. Mount the bracket on the bottom rail with two screws so the schematic labels are on the inside of the door facing the heater control panel and the warning label is facing out.

Figure 22. Hinged access door mounting: A diagram showing the mounting of the hinged access door assembly.

25. Install the four screws that secure the heat section access panel to close access to the electric heat section.
26. Scratch out the square on unit nameplate showing heater model installed in unit.

Option Board Addressing

1. If installing a new Indoor Options Module (IOM), set the IOM Module address to 75 on the two rotary dials on the board.
2. Set SW1 to 7 and SW2 to 5.

Symbio 700 UC configuration changes

Note: Configure after installing the electric heat accessory.

Figure 23. Symbio user interface: A diagram of the Symbio 700 user interface, showing the keypad layout (Home, Arrows, Enter, Cancel) and screen elements.

On-board menu and keypad:

1. Press Home.
2. Press the Down Arrow ⬇️ and select Utilities.
3. Press the Checkmark ✔️.
4. Press the Down Arrow ⬇️ and select Unit Config.
5. Press the Checkmark ✔️.
6. Press the Down Arrow ⬇️ and select Unit Config.
7. Press the Checkmark ✔️.
8. Press the Down Arrow ⬇️ and select Primary Heating Source.
9. Press the Checkmark ✔️.
10. Press the Down Arrow ⬇️ and select Electric.
11. Press the Checkmark ✔️.
    • For Primary Heating Type, select Staged.
12. Press the Checkmark ✔️.
    • For Primary Heating Stages, press the Checkmark ✔️.
13. Press the Up Arrow ⬆️ to 2 (two stages of electric heat) or press the Checkmark ✔️ for 1 stage of electric heat.
14. Press the Down Arrow ⬇️ or Up Arrow ⬆️ to Save Config.
15. Press the Checkmark ✔️.
16. Press the Up Arrow ⬆️ and select Yes.
17. Press the Checkmark ✔️.

[On the bottom line] The display will say Updating.

Using the app:

1. Connect to the Symbio™ 700 board through Bluetooth.
2. Select the Settings menu.
3. Select View Configuration.
4. Select Edit at the top right of the screen.
5. Select Proceed to stop the equipment operation.

Configuration Steps:

6. Scroll down to Primary Heating Source.
7. Tap Not Installed.
8. Select Electric.
9. Select Save in the top right of the screen.
10. Scroll down to Primary Heating Type.
11. Confirm this is set to Staged.
12. Scroll down to Primary Heating Stages and tap --Select One--.
13. Choose the correct number of stages.
14. Select Save.
15. Select Save again to save all configurations.