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Heat Pump and Thermostat Wiring and Operation

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									            Heat Pump/Thermostat Wiring and Operation
Heat Pump brand is NORMALLY HEAT/ A.K.A
Heat Pump with O/B energized in Cooling:

Call:           Heat
Dipswitch:      3 (ON), 4 (ON)




Wiring:         Wire Y from the stat to Y1 on the board. Wire Y1T from
                the board to Y on the heat pump.
1.




Action:         Stat sends heat call signal from Y1 to Y1T on the board
                and outputs the signal from Y1T on the board to Y on the
                heat pump. This engages the heat cycle since the
                reversing valve is in its relaxed/non-energized position.

**NOTE**        Reverse valve solenoid is: Energized in Cool Mode
                                          De-Energized in Heat Mode




                                                                        1
Heat Pump brand is NORMALLY HEAT/ A.K.A
Heat Pump with O/B energized in Cooling:


Call:         Cool
Dipswitch:    3 (ON), 4 (ON)




Wiring:       Wire W/OB from stat to W1/OB on the board. Wire
              from W1T/OB from the board to O/B on the heat pump.




2.



Action:       Stat sends cool call signal from W/OB to W1/OB on the
              board and outputs the signal to W1T/OB on the board to
              O/B on the heat pump. This engages the cool cycle since
              the reversing valve is in its energized position.

**NOTE**      Reverse valve solenoid is: Energized in Cool Mode
                                        De-Energized in Heat Mode

                                                                    2
Heat Pump brand is NORMALLY COOLING/ A.K.A
Heat Pump with O/B energized in Heating:

Call:        Heat
Dipswitch:   3 (ON), 4 (OFF)




Wiring:      Wire W/OB from the stat to W1/OB on the board. Wire
             from W1T/OB on the board to O/B on the heat pump.

3.




Action:      Stat sends heat call signal from W/OB to W1/OB on the
             board and outputs the signal to W1T/OB on the board to
             O/B on the heat pump. This engages the heat cycle since
             the reversing valve in its energized position.
**NOTE**     Reverse valve solenoid is: Energized in Heat Mode
                                         De-Energized in Cool Mode




                                                                   3
Heat Pump brand is NORMALLY COOLING/ A.K.A
Heat Pump with O/B energized in Heating:

Call:        Cooling
Dipswitch:   3 (ON), 4 (OFF)




Wiring:      Wire Y from the stat to Y1 on the board.
             Wire Y1T from the board to the Y on the heat pump.
4.




Action:      Stat sends cool signal from Y to Y1 on the board and
             outputs the signal to Y1T on the board to Y on the heat
             pump. This engages the cool cycle since the reversing
             valve is in its relaxed/non-energized position.

**NOTE**     Reverse valve solenoid is: Energized in Heat Mode
                                       De-Energized in Cool Mode



                                                                       4
                          Common Heat Pump Brands

Brand                               Rev. Valve Energizes In          Diagram

 Buderus                                                  Cooling   1 or 2
 Carrier                                                  Cooling   1 or 2
(Bryant,Payne, ICPArcoaire,Comfortmaker,Heil,Keeprite)
 Goodman(Amana,Janitrol)                                  Cooling   1 or 2
 Lennox                                                   Cooling   1 or 2
(Armstrong,Ducane,Aires,Concord)
 Mitsubishi                                               Heating   3 or 4
 Nordyne                                                  Cooling   1 or 2
(Gibson,Broan,Maytag,Kelvinator,Frigidair,Tappan,Philco)
   Rheem(Ruud)                                            Heating   3 or 4
   Samsung                                                Cooling   1 or2
   Sanyo                                                  Cooling   1 or 2
   Sears(Kenmore)                                         Heating   3 or 4
   Trane(Amer.Std,G.E)                                    Cooling   1 or 2
   Whirlpool                                              Cooling   1 or 2
   York(Coleman,Luxair,Dayton)                            Cooling   1 or 2




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