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This will allow you to keep a record of your old thermostat’s wiring configuration should you need to refer to it at a later time. This will also help our Technical Support Department determine your system type and proper wiring, should you need to contact them. Wire color does not indicate the function of the wire, this is being used only to help determine which wire has what letter designation. After writing down the wire colors and letters, use the terminal stickers to label the wires. Figures 3a and 3b will help you depending on system type; Conventional or Heat Pump. Not all terminals will be used, this will be determined by your system type. To ensure wires do not fall back into the wall hole, you may tape them to the wall, or wrap them around a pencil. Figure 4. may assist you if your old thermostat is a heat pump from one of the listed Manufacturers and your wire labels do not match. 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 Hea...

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