Installation, Operation, and Maintenance

Safety Warnings

WARNING: Only qualified personnel should install and service the equipment. Improper installation or alteration by unqualified persons could result in death or serious injury. Always observe precautions in literature, tags, stickers, and labels.

WARNING: 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. Follow NEC and local/state/national electrical codes.

WARNING: Failure to wear proper PPE for the job could result in death or serious injury. Technicians MUST wear appropriate PPE (e.g., cut-resistant gloves, safety glasses, hard hat, fall protection, electrical PPE, arc flash clothing) and refer to Safety Data Sheets (SDS) and OSHA guidelines.

WARNING: Follow EHS Policies! Failure to follow instructions could result in death or serious injury. All personnel must follow company EHS policies. Non-Trane personnel should always follow local regulations.

WARNING: Cancer and Reproductive Harm! This product can expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Visit www.P65Warnings.ca.gov for more information.

WARNING: Safety Hazard! Failure to follow instructions could result in death or serious injury or property damage. This unit is not to be used by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless supervised. Do not allow children to play on or clean the unit without supervision.

WARNING: Safety Hazard! Failure to follow instructions could result in death or serious injury or property damage. Connect the air handler to an outdoor unit suitable for use with R-454B refrigerant only.

WARNING: Hazardous Voltage! Failure to disconnect power before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects, before servicing. Follow proper lockout/tagout procedures and verify power is off with a voltmeter.

WARNING: Grounding Required! Failure to follow instructions could result in death or serious injury, or property damage. Reconnect all grounding devices. If grounding components are removed for service, return them to their original position and fasten properly.

WARNING: Risk of Fire -- Flammable Refrigerant! Failure to follow instructions could result in death or serious injury, and equipment damage. To be repaired only by trained service personnel. Do not puncture refrigerant tubing. Dispose of properly.

WARNING: Live Electrical Components! Failure to follow electrical safety precautions could result in death or serious injury. Have qualified personnel perform tasks involving live electrical components. Ensure electrical meters are properly rated.

CAUTION: Sharp Edges! Failure to follow instructions could result in minor to moderate injury. Wear necessary PPE, including gloves and arm guards, when working around sharp edges.

CAUTION: Corrosion Hazard! Failure to follow instructions could result in personal injury or equipment damage. Do not use the air handler during finishing phases of construction or remodeling due to potential condensate formation and corrosive conditions from paint and other components.

Introduction

Read this manual thoroughly before operating or servicing this unit. This document is customer property and must remain with the unit.

Safety advisories (Warnings, Cautions, Notices) appear throughout this manual. Strict observance of these precautions is essential for personal safety and proper machine operation.

• 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, or alert against unsafe practices.
• NOTICE: Indicates a situation that could result in equipment or property-damage only accidents.

Important Environmental Concerns

Trane advocates responsible handling of all refrigerants. Technicians must be certified, and all applicable local, state, and federal regulations (e.g., USA's Federal Clean Air Act Section 608) must be followed for handling, reclaiming, recovering, and recycling refrigerants and equipment.

Copyright and Trademark

This document and its information are the property of Trane. Reproduction or use without written permission is prohibited. Trane reserves the right to revise this publication at any time. All trademarks referenced belong to their respective owners.

Revision History

• Supersedes literature number 18GF81D1-1*-EN.
• Added Supply duct flange kit number in optional accessories.
• Updated wiring diagram.
• Updated Electrical Data tables.
• Updated Table 4 of Refrigerant Leak Detection System.
• Updated Section 8 of Installation instructions.

General Information

Standard Features

• Multi-position installation: upflow, downflow, horizontal left, and horizontal right.
• Painted galvanized steel exterior with fully insulated cabinet (R4.2 value).
• Sturdy polycarbonate drain pans.
• Factory-installed drain pans, shipped for upflow applications.
• 208/230 VAC operation.
• Multi-speed direct drive blower.
• Factory-installed R-454B thermal expansion valve (TXV).
• All aluminum coil.
• Bottom return.
• Meets minimum leakage requirements for Florida and California building codes.

Optional Accessories

• 4, 5, 8, 10, 15, 20, and 25 KW single-phase electrical heaters.
• Circuit breakers for single-phase heaters (4, 5, 8, 10, 15, 20, 25 KW).
• Lugs for single-phase heaters (4, 5, 8, 10 KW).
• Lugs for three-phase heaters (10, 15 KW).
• Single point power entry kit (for 15 and 20 KW heaters).
• Supply duct flange kit - BAYTEMSPFG1A.
• Downflow sub-base kits - TAYBASE185, TAYBASE235, TAYBASE260.
• Slim fit filter box kits - BAYSF1185AAA, BAYSF1235AAA, BAYSF1265AAA.
• Breaker seal kit - TEMBRKSEALKT01A.
• Downflow condensate management kit - BAYTEMDFKT1A.
• CleanEffects whole house air cleaners - EFD175DLAH000B, EFD215DLAH000B, EFD235DLAH000B.

Installation Recommendations

The A5AHC series air handler is designed for installation in various locations (closet, utility room, alcove, basement, attic). It is applicable to air conditioning and heat pump systems. Field-installed electric resistance heaters are available.

⚠️ Important: Installation must comply with the National Electric Code (NFPA No. 90A and 90B) and other local codes/utility requirements. Coil, drain pan, and sensor repositioning may be required for horizontal left, horizontal right, and downflow applications. Refer to coil conversion instructions.

? Notes:

• Air handlers have been evaluated for mobile home use (Code of Federal Regulations, Chapter XX, Part 3280).
• Seal all electrical and refrigerant line penetrations when installed in unconditioned spaces to prevent condensation.
• Manufacturer recommends A.H.R.I. approved, matched indoor and outdoor systems for maximum efficiency, performance, and reliability.
• There is no declared maximum altitude for operation.
• Refrigerant system charging must follow outdoor unit manufacturer instructions.

Information on Servicing

All replacement parts must meet manufacturer specifications.

Prior to Beginning Work

Before working on systems with flammable refrigerants, perform safety checks to minimize ignition risk:

• Work under a controlled procedure to prevent flammable gas/vapor presence.
• Instruct all personnel on the nature of the work. Avoid confined spaces.
• Check the area with an appropriate refrigerant detector (suitable for all applicable refrigerants, non-sparking, sealed, or intrinsically safe) before and during work.
• Have appropriate fire extinguishing equipment (dry powder or CO2) readily available if hot work is to be conducted.
• Keep all possible ignition sources (including smoking) far from the work site. Display "No Smoking" signs.
• Ensure the area is open or adequately ventilated before breaking into the system or conducting hot work. Ventilation should continue during work to safely disperse any released refrigerant.
• For installations using flammable refrigerants, ensure equipment markings remain visible and legible, and that refrigerant piping/components are protected from corrosive substances or are constructed of resistant materials.

Repairs to Electrical Components

Use only fit-for-purpose, correctly specified electrical components. Always follow manufacturer maintenance and service guidelines. Consult the manufacturer's technical department if unsure. Initial safety checks include discharging capacitors safely, ensuring no live components are exposed, and verifying earth bonding continuity. Check cabling for wear, corrosion, pressure, vibration, sharp edges, and aging effects.

Detection of Flammable Refrigerants

Never use potential sources of ignition (like halide torches) to detect refrigerant leaks. Electronic leak detectors are acceptable, but ensure they are calibrated for the specific refrigerant, suitable for flammable refrigerants, and set to an appropriate sensitivity (e.g., 25% of LFL). The bubble method is also acceptable. If a leak is found requiring brazing, recover all refrigerant or isolate the leak area before proceeding. Remove all naked flames if a leak is suspected.

Removal and Evacuation

Follow conventional procedures for breaking into the refrigerant circuit, with special attention to flammable refrigerant best practices. This includes safely removing refrigerant per regulations, evacuating, purging with inert gas (e.g., oxygen-free nitrogen) if necessary, and then opening the circuit. Compressed air or oxygen must not be used for purging. Ensure vacuum pump outlets are not near ignition sources and ventilation is available.

Charging Procedures

Follow conventional procedures, plus these requirements: prevent refrigerant contamination, keep hoses short, keep cylinders in the correct position, earth the system before charging, label the system upon completion, and avoid overfilling. Pressure-test with nitrogen and leak-test after charging and before commissioning. A follow-up leak test is required before leaving the site.

Recovery

When removing refrigerant for servicing or decommissioning, use appropriate refrigerant recovery cylinders designated and labeled for the specific refrigerant. Ensure cylinders have a pressure-relief valve and shut-off valves. Evacuate and cool empty cylinders before recovery. Recovery equipment must be in good working order with instructions available and suitable for flammable refrigerants. Calibrated weighing scales and leak-free hoses are required. Process recovered refrigerant according to local legislation. Do not mix refrigerants. Evacuate compressors and oils to acceptable levels before removal. Do not heat compressor bodies with open flame. Drain oil safely.

Decommissioning

Ensure familiarity with the equipment. Isolate the system electrically. Confirm availability of mechanical handling equipment, PPE, supervision by a competent person, and that recovery equipment/cylinders conform to standards. Pump down the system if possible. If vacuum is not possible, use a manifold to remove refrigerant from various parts. Place cylinders on scales before recovery. Do not overfill cylinders (max 80% volume liquid charge). Do not exceed cylinder working pressure. Promptly remove filled cylinders and close isolation valves. Recovered refrigerant must be cleaned and checked before charging into another system. Label decommissioned equipment. For appliances with flammable refrigerant, ensure appropriate labels are affixed.

Outline Drawing

Figure 1 depicts the general physical layout of the air handler. Specific dimensions for each model are provided in Table 1. Minimum service clearances are also detailed.

Minimum Unit Clearance Table

Note: This unit is approved for installation clearances to combustible material as stated on the unit rating nameplate.

Table 1. Dimensions (inch)

Wiring Diagram

Figure 2 provides the unit's wiring diagram, illustrating electrical connections. For refrigerant leak detection and control board diagnostic flash codes, refer to Table 3 on page 13.

Refrigerant Leak Detection System

The air handler is equipped with a refrigerant leak detection system comprising a refrigerant sensor and a mitigation control board. This system automatically detects leaks in the indoor coil and initiates actions to mitigate risks, including:

• Turning on the indoor unit blower to dilute leaked refrigerant.
• Fully opening zoning dampers (if applicable).
• Turning off the outdoor unit compressor.
• De-energizing potential ignition sources (e.g., electronic cleaners).
• Energizing an audible alarm (if equipped).

WARNING: Risk of Fire -- Flammable Refrigerant! To be repaired only by trained service personnel. Do not puncture refrigerant tubing. Dispose of properly.

WARNING: Leak Detection System Installed! The unit must be powered at all times after installation (except during servicing) for the leak detection system to function. Failure to do so could result in death, serious injury, or equipment damage.

WARNING: Risk of Fire! Relocate the refrigerant sensor if installing the unit in any orientation other than upflow. Failure to follow instructions could cause a fire resulting in death, serious injury, and equipment damage.

Refrigerant sensors must only be replaced as specified by the manufacturer.

Minimum Conditioned Space

The installer must verify that the total conditioned space is large enough to safely dilute any leaked refrigerant from the indoor coil, according to Table 2, which lists minimum conditioned space (ft²) based on refrigerant charge (lb) and installation altitude.

Table 2. Minimum space conditioned by the appliance

Airflow Adjustment

All A5AHC model air handlers are factory configured for sufficient airflow to dilute leaked refrigerant.

Verification of Mitigation Actions

After installation, verify that the refrigerant leak detection system actuates all mitigating actions. This can be tested by shorting the two test pins on the mitigation control board header. The mitigating actions will run for approximately 5 minutes. Figure 3 shows the location of the test pins.

If any mitigating actions do not actuate, check field wiring connections against the diagrams and consult the diagnostic codes in Table 3.

Table 3. MCB diagnostic code table

For Software V07.1 and earlier

For Software V9.1 and later

? Notes:

• The Amber LED diagnostic indicator should always be "ON".
• The software version is printed on a label on the control board.

Installation Instructions

1. Unpacking

Carefully unpack the unit and inspect for damage. Notify the carrier of any damage. Check the rating plate to ensure the model number, voltage, and kits match the order. Notify the manufacturer within 5 days of any discrepancies or parts shortages.

2. Location

The air handler can be installed in a closet, alcove, utility room, basement, crawl space, or attic. Minimum clearances must be met. A downflow sub-base may be required for electric heat applications. Equipment must be installed to reduce the likelihood of ignition of leaked refrigerant.

WARNING: Risk of Fire! Ensure all combustion appliances in the same room with continuous pilot lights have an effective flame arrestor. Check all indoor field-made joints for refrigerant leaks using an electronic leak detector calibrated for R-454B (sensitivity of 5 grams/year or better) after charging. The room must be constructed to avoid stagnation or fire hazards in case of a refrigerant leak.

Install the unit in a level position for proper condensate drainage. Up to 1/4" rise over width or depth is allowed for sloping towards drain connections. Unit must be between level and 1/4" rise, sloping toward drains.

If installed in a closet or utility room, ensure adequate space and an opening for unit replacement. Service is from the front, requiring 21" clearance unless the closet door aligns with the front.

For unconditioned spaces (attic, crawl space), ensure sufficient air circulation to prevent moisture collection. A drain pan must be installed under the unit when installed above a finished ceiling or in an unconditioned space.

3. Duct Work

WARNING: Risk of Fire! Only approved auxiliary devices suitable for the refrigerant must be installed in the ductwork. Devices that may be potential ignition sources must not be installed unless approved. Ductwork installation must comply with NFPA No. 90A and No. 90B, and applicable codes for insulation.

4. Condensate Drain

The unit has primary and auxiliary condensate drains with 3/4" NPT connections. The primary drain must be trapped outside the unit and piped per building codes. A properly designed trap maintains a water column height at least equal to the normal negative static pressure. Insulate the primary drain line where dew point temperatures may be met.

Do not reduce the drain line size below the connection size. Pipe condensate to an open drain or outside. All drains must pitch downward at a minimum of 1/4" per foot.

⚠️ Important: If a cleanout Tee is used, the standpipe must be sealed/capped. If a vent Tee is used, it must be downstream from the trap.

5. Refrigerant Piping

Pipe-work must be protected from physical damage and comply with national and local codes. Field joints must be accessible for inspection. The indoor coil has a holding charge of dry air. Remove the TXV bulb from the tubing inside the unit before brazing line set connections. Shield painted areas during brazing. After brazing, replace and insulate the TXV bulb. For optimal performance, the TXV bulb can be located and insulated on the vapor line outside the unit, positioned at the 10 or 2 o'clock position on the line relative to the floor.

Remove red flammable refrigerant warning tags before brazing and replace them afterward.

After field piping, pressure test with nitrogen and vacuum test according to requirements:

• Pressure Test: Pressurize field piping and indoor coil with dry nitrogen to the lower of the maximum operating pressures (likely 600 psi). Maintain pressure for at least one hour with no decrease. Check for leaks with a soapy solution. Remove nitrogen pressure and repair leaks before continuing.
• Vacuum Test: Do not open service valves until leak check and evacuation are complete. Evacuate until the micron gauge reads no higher than 350 microns, then close the valve to the vacuum pump. Evacuation is complete if the gauge does not rise above 500 microns in one minute and 1500 microns in ten minutes. Blank off the pump and gauge, and close the manifold gauge set valve.

All charging procedures must follow the outdoor unit manufacturer's instructions. ⚠️ Important: Never use potential ignition sources to search for refrigerant leaks. After charging, check all indoor field-made joints for leaks using an electronic leak detector calibrated for R-454B with a sensitivity of 5 grams per year or better.

6. Metering Device

All units are shipped with an internally checked, non-bleed TXV designed for air conditioning or heat pump operation. Some outdoor models may require a start assist kit.

7. Blower

The unit has a multi-speed, direct drive motor. The unit is shipped with factory set cooling and heating airflows. Performance tables are available for additional airflow settings. Disconnect power before making adjustments. Check airflow and temperature drop across the evaporator coil for sufficient airflow.

? Note: For optimal performance, seal front panel seams to reduce air leakage.

8. Airflow Adjustment

Set indoor airflow using motor taps:

• Full-stage airflow: Retain black wire on tap 1. Install green wire on tap 2, 3, 4, or 5 (refer to "Performance and Electrical Data" for settings). If electric heater is configured, install the pink wire on any tap. The green or pink wire tap selection must meet or exceed minimum airflow requirements in "Minimum Airflow CFM".
• Two-stage airflow (optional): Separate Y1 and Y2 wires at field wiring pigtail connections. Independently wire Y1 and Y2 to a compatible two-stage thermostat. First-stage airflow is approximately 75% of full-stage airflow.

? Notes:

1. The blower motor runs the low-stage when Y2 is not energized (no additional motor tap adjustment needed).
2. The system consistently provides full-stage airflow when the electric heater is operating, even with two-stage airflow configuration.

9. Wiring

Consult all schematic and pictorial wiring diagrams for compatibility and specific requirements. Field wiring must comply with the latest National Electric Code (NFPA No. 70) and local codes. Check unit rating plates for voltage, minimum circuit ampacity, and maximum overcurrent protection. Supply circuit power wiring must use 75°C (167°F) minimum copper conductors. Copper supply wires must be sized per NEC or local code, whichever is more stringent.

A disconnection means with contact separation in all poles must be incorporated into the fixed wiring for power supply disconnection, in accordance with codes.

The unit is shipped wired for 230/240 Volt AC 60 HZ 1 Phase Operation. For 208 VAC 60HZ operation, follow instructions on the unit wiring diagram to change the low voltage transformer. Ensure the unit is properly grounded.

Class 2 low voltage control wiring should not be run in conduit with power wiring and must be separated unless Class 1 wire with proper voltage rating is used. Low voltage control wiring should be 18 Awg (105°C minimum). For lengths over 100ft, use 16 Awg wire. Maintain separation between control and power wiring.

10. Air Filter

An air filter must be installed before the evaporator coil to protect it, the blower, and internal parts from dirt and dust. A remote filter must be installed. Consult the filter manufacturer for proper sizing and maximum velocity requirements. ⚠️ Important: Air filters shall meet UL 900 test requirements.

11. Thermostat

Select a single or two-stage thermostat commonly used with HP or AC heating/cooling with electric heat. The thermostat energizes the fan on demand for heat or cool. Install the thermostat on an inside wall, away from drafts, lights, or other heat sources, in a location with sufficient air circulation from the controlled rooms.

12. Sequence of Operation

• Cooling (Cooling only): Thermostat calls for cooling (R to G), energizing the blower. R to Y completes the circuit, energizing the outdoor unit's compressor and condenser fan. R to Y (or R to Y2 for two-stage) energizes the indoor unit relay, activating high-stage airflow.
• Cooling (heat pump): Similar to cooling only, with R to O energizing the reversing valve to the cooling position.
• Heating (heat pump): Thermostat calls for heating. Blower is energized (R to G). R to Y energizes the outdoor unit compressor and fan. R to Y (or R to Y2) activates high-stage airflow. Reversing valve is not energized for heating. If indoor temperature drops, R to W energizes electric heat contactors.
• Heating (electric heat only): Thermostat must be set to bring the blower on with electric heat. R to G energizes the blower. R to W (or R to W1) activates high-stage airflow. R to W2 directly energizes the blower. R to W energizes heating contactors.
• Defrost: Supplemental heat during defrost can be provided by connecting the X2 (black) wire from the outdoor unit to W1 or W2 at the indoor unit.

13. Operational and Checkout Procedures

Verify all procedures in the "Refrigerant Leak Detection System" section. For proper performance, operate and adjust charge per the outdoor unit's Service Facts document. Check the system against the checkout list at the back of this document.

14. Maintenance

Inspect, clean, or replace system air filters at least monthly. Ensure access panels are replaced and secured before operation. Periodic maintenance should be scheduled and conducted by trained professional service personnel at least annually, including electrical and refrigerant component testing and inspection. The heat transfer surface should be cleaned. The blower motor is permanently lubricated.

Field Wiring Diagrams

Figure 4 illustrates field wiring diagrams for various system configurations, including Single Stage Cooling Only, Single Stage Heat Pump, 2 Stage Indoor Airflow Cooling Only, and 2 Stage Indoor Airflow Heat Pump. These diagrams are for qualified personnel.

Notes:

1. Units with pigtails require wirenuts for connections.
2. Cap all unused wires.
3. In AC systems for multiple stages of electric heat, jumper W1 and W2 together if the comfort control has only one stage of heat.

External Switches and Accessories

Optional connections are available on the mitigation control board (see Figure 5):

• ACC1 and ACC2: For accessories that could be a source of ignition (e.g., electronic air cleaner).
• Aoa/Aob: For audible alarms on the refrigerant detection system.

ACC1, ACC2, and Aoa/Aob are dry contacts requiring source voltage. Connect using field-supplied female spade connections (3/16" for Aoa/Aob, 1/4" for ACC1, ACC2).

Figure 5 shows typical connections for an Electronic Air Cleaner and a 24VAC Audible Alarm.

Performance and Electrical Data

Detailed performance and electrical data are provided in the following tables:

Table 4. Airflow performance - model A5AHC002A1B30A

(a) In horizontal and downflow applications, airflow should be limited to 1000 CFM due to condensate blowoff.

Table 5. Airflow performance - model A5AHC003A1B30A

(a) In horizontal and downflow applications, airflow should be limited to 1000 CFM due to condensate blowoff.

Table 6. Airflow performance - model A5AHC004A1D30A

Table 7. Airflow performance - model A5AHC005A1D30A

Table 8. Airflow performance - model A5AHC006A1D30A

(a) In horizontal and downflow applications, airflow should be limited to 1700 CFM due to condensate blowoff.

Table 9. Airflow performance - model A5AHC007A1D30A

(a) In horizontal and downflow applications, airflow should be limited to 1800 CFM due to condensate blowoff.

Notes:

• TAP 1 is not an airflow selection. Black wire must always be on TAP 1.
• Values are with wet coil, no filter, and no heaters.
• CFM correction for dry coil = add 3%.
• = factory setting
• First-stage airflow is approximately 75% of full-stage airflow setting.

Table 10. Electrical data - model A5AHC002A1B30A

(a) Motor Amps

Table 11. Electrical data - model A5AHC003A1B30A

(a) Motor Amps (b) MCA and MOP for circuit 1 contains the motor amps.

Table 12. Electrical data - model A5AHC004A1D30A

(a) Motor Amps (b) MCA and MOP for circuit 1 contains the motor amps.

Table 13. Electrical data - model A5AHC005A1D30A

(a) Motor Amps (b) MCA and MOP for circuit 1 contains the motor amps.

Table 14. Electrical data - models A5AHC006A1D30A, and A5AHC007A1D30A

(a) Motor Amps (b) MCA and MOP for circuit 1 contains the motor amps.

Minimum Airflow CFM

Tables 15 through 20 specify the minimum airflow CFM required for various heater configurations and speed tap selections for each model.

Table 15. Minimum airflow CFM - model A5AHC002A1B30A

Table 16. Minimum airflow CFM - model A5AHC003A1B30A

Table 17. Minimum airflow CFM - model A5AHC004A1D30A

Table 18. Minimum airflow CFM - model A5AHC005A1D30A

Table 19. Minimum airflow CFM - model A5AHC006A1D30A

Table 20. Minimum airflow CFM - model A5AHC007A1D30A

Heater Pressure Drop Table

Table 21 provides heater pressure drop values (in inches W.G.) for various airflow CFM and number of heater racks.

Table 21. Heat pressure drop

Heater Racks

Unit Conversion Instructions

WARNING: Risk of Fire! Relocate the refrigerant sensor if installing the unit in any orientation other than upflow. Failure to follow instructions could cause a fire resulting in death, serious injury, and equipment damage.

Horizontal Left

Important: For horizontal applications, airflow restrictions apply for condensate blow off. Refer to Air Flow Performance Tables. Follow these steps for horizontal left configuration:

1. Remove front panels.
2. Pull refrigerant sensor and clip away from the primary drain pan and remove it. Secure sensor to the secondary pan using the provided clip, positioning it near secondary drain lines.
3. Position extra wire length in the secondary drain pan.
4. Replace all panels.

Downflow

Important: For downflow applications, airflow restrictions apply for condensate blow off. Refer to Air Flow Performance Tables. Follow these steps for downflow configuration:

1. Remove front panels.
2. Remove fasteners on both sides of the coil.
3. Remove and retain the two screws holding the center horizontal bracket; rotate it out of place.
4. Pull refrigerant sensor away from the primary drain pan, detach it from the wire harness, and move it aside.
5. Slide the coil assembly out. Remove and discard the horizontal drain pan.
6. Remove screws holding coil support brackets on both sides of the cabinet and retain them. Seal the holes.
7. Rotate and lift the two coil support brackets to remove them from the front slots.
8. Rotate the unit into the downflow orientation.
9. Pre-drill four clearance holes in the cabinet at dimples below where the coil support bracket screws were removed (two holes per side).
10. Replace the center horizontal bracket using the retained screws.
11. Place coil support brackets into the slots and rotate into place, pushing downward to lock. Route the refrigerant sensor wire harness between the bracket and insulation.
12. Secure each bracket with the previously removed screws.
13. Slide the coil assembly back into the cabinet.
14. Clip the refrigerant sensor back onto the primary drain pan and reconnect it to the wire harness. Position extra wire length next to the coil.
15. Remove the appropriate knockout for condensate piping.
16. Replace all panels.

Horizontal Right

Important: For horizontal applications, airflow restrictions apply for condensate blow off. Refer to Air Flow Performance Tables. Follow these steps for horizontal right configuration:

1. Remove front panels.
2. Remove fasteners on both sides of the coil and retain coil retaining brackets and screws.
3. Remove and retain the two screws holding the center horizontal bracket; rotate it out of place.
4. Pull refrigerant sensor away from the primary drain pan, detach it from the wire harness, and move it aside.
5. Note the horizontal drain pan orientation (up/down).
6. Slide the coil assembly out. Important: On some models, the top panel assembly of the coil must be rotated for proper condensate management. Release the front and rear tabs on the right side of the top baffle by pivoting a flathead screwdriver downward under the flange.
7. Rotate the top baffle 180 degrees and snap all four corner tabs to lock.
8. Remove left side water diverter brackets and screws, and reinstall them on the right side. The coil slabs and mounting hole locations vary by tonnage; refer to illustrations for correct mounting positions. Water diverter brackets are not symmetrical.
9. To allow the horizontal pan to slide in on the right, cut and remove the zip tie holding the sensor wire harness on the right side of the coil cabinet.
10. Relocate the horizontal drain pan from the left side of the coil to the right side.
11. Remove the drain pan support bracket (do not discard). Remove the two drain plugs from the front of the drain pan and insert them in the drains at the rear of the drain pan.
12. Important: When reinstalling the coil, ensure the coil corner locks into place under the tab in the side bracket to support the coil weight horizontally.
13. Reinstall the drain pan support bracket between the two drain plugs.
14. Slide the coil assembly back into the air handler cabinet. Important: Ensure the coil corner locks into place under the tab in the side left bracket for horizontal right position support.
15. Replace the center horizontal bracket using the previously removed screws.
16. Replace the two coil retaining brackets.
17. Rotate the unit into the horizontal right position.
18. Install the sensor onto the secondary drain pan using the provided clip, positioning it close to the drain lines. Reconnect the sensor to the wire harness and position extra wire length in the drain pan.
19. Replace all panels.

Checkout Procedures

The final installation phase involves checkout procedures. Confirm all requirements in this document have been met:

• All wiring connections are tight and properly secured.
• Voltage and running current are within limits.
• All refrigerant lines are isolated, secure, and not in direct contact with each other or structure.
• All braze connections checked for leaks; a vacuum of 350 microns confirms a leak-free and dry system.
• Refrigerant sensor is properly relocated if the unit is installed in any orientation other than upflow.
• Final unit inspection to confirm factory tubing has not shifted during shipment; adjust tubing if necessary so tubes do not rub against each other or any component when the unit runs.
• Ductwork is sealed and insulated.
• All drain lines are clear with joints properly sealed. Pour water into the drain pan to confirm proper drainage and priming of the drain trap.
• Supply registers and return grilles are open and unobstructed; air filter is installed.
• Indoor blower and outdoor fan are operating smoothly and without obstruction.
• Indoor blower motor is set on the correct speed setting to deliver required CFM; blower and fan set screws are tight.
• Cover panels are in place and properly tightened.
• System functions safely and properly in all modes.
• Refrigerant leak detection system mitigating actions are verified.
• All refrigerant safety procedures have been verified.
• Owner has been instructed on system use and provided with the manual.

About Trane and American Standard Heating and Air Conditioning

Trane and American Standard create comfortable, energy-efficient indoor environments for residential applications. For more information, visit www.trane.com or www.americanstandardair.com.

The manufacturer has a policy of continuous data improvement and reserves the right to change design and specifications without notice. They are committed to using environmentally conscious print practices.

Document Revision: AHR-SVX005A-EN 30 May 2025 Supersedes 18-GF81D1-1A-EN (March 2024)