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It is located on the back of this sheet. These tips will also help you in wiring: • Only 1 reversing valve is needed to run a heat pump. If both “O” and “B” are present, “B” may be a common wire. • Often, 2-wire heat only systems do not have terminal labels. Connect 1 wire to the Rh terminal and the other to W. • If you have a 3-wire hot water system, the damper valve control wire will be labeled and attached to the “A” terminal. • If you need further assistance with wiring, or determining your system type, you can contact our Technical Support Department. See the “Technical Support” section for information. Figure 4. Hunter Carrier Coleman Comfortmaker Bryant, Payne Rheem Ruud Trane, Weathertron York Lennox (1) Lennox (2) R R R R R R R R R V-VR Y Y or Y1 Y Y Y Y Y Y Y M E W2 W2 W1 W2 W2 W W W1 Y E E Jumper to W2 E E X2 Jumper to W2 E E O O O O O O O R B B B G G G G G G G G G F L L or F L L or X L L X L C C X C, X, X1 C, X, X1 X B B C X HeaT PumP CoNveNTioNal 4 Wire Heat / Cool Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RH Y G W JumperHeat Power Cool Contactor Fan Relay Heat Contactor 3 Wire Cool Only Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RC Y G JumperCool Power Cool Contactor Fan Relay 2 Wire Heat Only Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RH W JumperHeat Power Heat Contactor 4 Wire with Common Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RH Y G W C JumperHeat Power Cool Power Cool Contactor Fan Relay Heat Contactor Common 5 Wire Heat / Cool Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A Heat Power Cool Power Cool Contactor Fan Relay Heat Contactor RH RC Y G W 3 Wire Heat Only Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RH G W JumperHeat Power Fan Relay Heat Contactor 3 Wire Hot Water with Damper Valve Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RH W A JumperHeat Power Heat Contactor Damper Valve Conventional Multi-Stage Thermostat Mounting PlateWall RH RC Y G W W2 Y2 C A RC Y G W W2 Y2 JumperHeat Power Cool Contactor Fan Relay Heat Contactor Second Stage Heat Second Stage Cool Single Stage Heat Pump Thermostat Mounting PlateWall R Y G L O B Aux/E Y2 C R Y G O JumperHeat 24V Supply Compressor Contact Fan Relay Cool Relay / Valve Thermostat Mounting PlateR Y G L O B Aux/E Y2 C Single Stage Heat Pump W/Aux Heat Wall R Y G O E C JumperHeat 24V Supply Compressor Contact Fan Relay System Monitor* Cool Relay / Valve Auxiliary Heat Common* * The common wire “C” and system monitor wire “L” may or may not be present. L Single Stage Heat Pump W/Heat Reversing Thermostat Mounting PlateWall R Y G L O B Aux/E Y2 C R Y G B C Jumper L * The common wire “C” and system monitor wire “L” may or may not be present. E Heat 24V Supply Compressor Contact Fan Relay System Monitor* Heat Relay / Valve Auxiliary Heat Common* Multi-Stage Heat Pump Thermostat Mounting PlateWall R Y G L O B Aux/E Y2 C R Y G L O E Y2 C Jumper * The common wire “C” and system monitor wire “L” may or may not be present. Heat 24V S...

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