I installed a furnace evaporator and condenser brand goodman 4 ton unit but need to know how to connect thermostat from condenser to the furnace to the thermostat if any suggestion.
How to connect thermostat to newly-installed condenser/evaporator unit
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What they said makes sense, but why the whole furnace and not just to evap coils? They are tough to get at for sure, and the labor cost may be prohibitive to just replace the evap. The other reason might be to pick up a rebate on the furnace if it's old enought.
The furnace doesn't need a Y terminal, and in a lot of cases when it does have one, it's not connected to anything in the furnace. Connect the wires from the thermostat as follows:
- Red connects to
Rin furnace andRon thermostat. - White connects to
Win furnace andWon thermostat. - Green connects to
Gin furnace andGon thermostat. - Yellow connects to the Red wire to the condensing unit.
- White wire from condensing unit connects to 24V common terminal of the transformer.
Notes:
The 24V common terminal of the transformer should be grounded to the chassis, as well as connected to PIN 6 of the Molex connector on the board.
*The "hot" 24V terminal of the transformer should be connected to PIN 3 of the Molex connector on the board.
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Best Answer
In the condensing unit, locate the contactor. There should be at least two low voltage terminals on the contactor (commonly on the side). Run a two wire cable between the condensing unit, and the furnace. Connect the wires from the cable, to the low voltage terminals on the contactor. In the furnace, connect one of the wires from this cable to the
Yterminal, and the other to theCterminal.At the thermostat, connect the yellow wire (or any additional wire in the thermostat cable), to the
Yterminal. Connect the other end of the yellow wire (the wire you connected to theYterminal of the thermostat), to theYterminal of the furnace.Notes: