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All electrical work must be done in conformance with the National Electrical Code (NFPA No. 70) and in conformance with local codes and authorities having jurisdiction. 2. For use with copper conductors only. CAUTION: Not suitable for use on systems exceeding 150 volts to ground. DF LP/HP PS RV SEN TSTAT LEGEND — Defrost Relay — Low or High-Pressure Switch (Optional) — Pressure Switch — Reversing Valve — Outdoor Coil Temperature Sensor — Thermostat Line Voltage Factory Fig. 9 — Wiring Diagram — 575B072; 208/230-3-60 Units CONNECTION THERMOSTAT BOARD (TB) W2 G C R Y O E 1 2 3 4 5 6 7 8 TO ELECTRIC HEATER ACCESSORY, IF EQUIPPED IFC LLSV LEGEND IFC — Indoor Fan Contactor LLSV — Liquid Line Solenoid Valve TB — Terminal Block Field Wiring NOTES: 1. For thermostat and subbase part no. see price pages. 2. Use copper conductors only. Fig. 10 — Wiring Diagram — 575C090,120; 230-3-60 Units —11— Heater Contactor Indoor Fan Contactor Indoor Fan Motor National Electrical Code LEGEND EQUIP — Equipment GND — Ground HC — IFC — IFM — NEC — TB — Terminal Block Fig. 11 — Wiring Diagram — 541A180 Unit With Standard Thermostat and Electric Heat —12— TB1 TB2 HEAT PUMP “A” TB2 HEAT PUMP “B” G2/(W) G3/(Y) COM G MED(HEAT) HI(COOL) (VALVE) FAN LO R Y1 Y2 W1 W2 G C O WHT WHT C2IFCC1 R Y1 Y2 W1 W2 G C X 524A-H HEAT ACCESSORY W1 W2 C 524A-H240 TERMINAL BLOCK TB1 FIELD POWER WIRING DISCONNECT FIELD POWER SUPPLY 3-Ph ONLY L1 L2 L3 EQUIP GND HC1 HC1 CIRCUIT BREAKER (5 HP AND LARGER) UNIT WIRING IFM BLK BLK BLK 21 22 23 12 13 11 1 2 3 HTR1 IFC RELAY BOARD (33ZCRLYBRD) TSTAT CR Y2 R Y1 C X W1 W2 G Y2 R Y1 C X W1 W2 G CR LEGEND NOTE: Use copper conductors only. CR — Control Relay (Field-Supplied) EQUIP — Equipment GND — Ground HC — Heating Contactor HTR — Electric Heater IFC — Indoor-Fan Contactor IFM — Indoor-Fan Motor TB — Terminal Block TSTAT — Thermostat Factory Wiring Field Control Wiring Fig. 12 — Wiring Diagram — Duplex 575C120 With 524A-H240 and Electric Heat —13— Y2 TB2 HEAT PUMP A 541A180 R B W1 A2 Y1 Q C P X 1 2 TB2 HEAT PUMP B 575C120 G2/(W) G3/(Y) COM G MED(HEAT) HI(COOL) (VALVE) FAN LO G2/(W) G3/(Y) COM G MED(HEAT) HI(COOL) (VALVE) FAN LO R Y1 Y2 W1 W2 G C X WHT WHT C2IFCC1 R Y1 Y2 W1 W2 G C X 524A-H HEAT ACCESSORY W1 W2 C 524A-H300 TERMINAL BLOCK TB1 FIELD POWER WIRING DISCONNECT FIELD POWER SUPPLY 3-Ph ONLY L1 L2 L3 EQUIP GND TB1 HC1 HC1 CIRCUIT BREAKER (5 HP AND LARGER) UNIT WIRING IFM BLK BLK BLK 21 22 23 12 13 11 1 2 3 HTR1 IFC RELAY BOARD (33ZCRLYBRD) RELAY BOARD (33ZCRLYBRD) TSTAT* CR CR R Y1 Y2 W1 W2 G C X CR LEGEND *Do not configure TSTAT for heat pump. NOTE: Use copper conductors only. CR — Control Relay (Field-Supplied) EQUIP — Equipment GND — Ground HC — Heating Contactor HTR — Electric Heater IFC — Indoor-Fan Contactor IFM — Indoor-Fan Motor TB — Terminal Block TSTAT — Thermostat Factory Wiring Field Control Wiring Y2 TB2 HEAT PUMP A 541A180 R B W1 A2 Y1 Q C P X 1 2 TB2 HEAT PUMP B 575C120 G2/(W) G3/(Y) COM G MED(HEAT) HI(COOL) (VALVE) FAN LO G2/(W) G3/(Y) COM G MED(HEAT) HI(COOL) (VALVE) FAN LO R Y1 Y2 W1 W2 G C X WHT WHT C2IFCC1 R Y1 Y2 W1 W2 G C X 524A-H HEAT ACCESSORY W1 W2 C 524A-H300 TERMINAL BLOCK TB1 FIELD POWER WIRING DISCONNECT FIELD POWER SUPPLY 3-Ph ONLY L1 L2 L3 EQUIP GND TB1 HC1 HC1 CIRCUIT BREAKER (5 HP AND LARGER) UNIT WIRING IFM BLK BLK BLK 21 22 23 12 13 11 1 2 3 HTR1 IFC RELAY BOARD (33ZCRLYBRD) RELAY BOARD (33ZCRLYBRD) TSTAT* CR CR R Y1 Y2 W1 W2 G C X CR LEGEND *Do not configure TSTAT for heat pump. NOTE: Use copper conductors only. CR — Control Relay (Field-Supplied) EQUIP — Equipment GND — Ground HC — Heating Contactor HTR — Electric Heater IFC — Indoor-Fan Contactor IFM — Indoor-Fan Motor TB — Terminal Block TSTAT — Thermostat Factory Wiring Field Control Wiring Fig. 13 — Wiring Diagram — Duplex 575C120 and 541A180 With 524A-H300 and Electric Heat LEGEND AFS — Airflow Switch (Sail Switch) CR — Control Relay DB — Defrost Board Factory Wiring Field Control Wiring NOTES: Y 1. Locate YEL wire between on DB and terminal 5 of CR3 and cut. 2. Splice airflow switch (AFS) (field supplied) contact wires (field provided) to two ends of cut YEL wire as depicted. Fig. 14 — Typical Field Wiring for Airflow Switch — 541A180/524A-H —14— PRE-START-UP IMPORTANT: Before beginning Pre-Start-Up or Start-Up, review Start-Up Checklist at the back of this book. The checklist assures proper start-up of the system and provides a record of unit condition, application requirements, system information, and operation at initial start-up. CAUTION: Do not attempt to start the heat pump system, even momentarily, until the following steps have been completed. Compressor damage may result. I. PRELIMINARY CHECKS 1. Check all air handler and other equipment auxiliary components. Consult manufacturer’s instructions regarding any other equipment attached to unit. If unit has field-installed accessories, be sure all are properly installed and correctly wired. If used, airflow switch must be properly installed. See Fig. 14 for typic...

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