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What is your cooling wire (Y) coming out of the air handler when all the wires you have available is R,G,C,W1,W2

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Hello Just connect Y to Y from the thermostat to the condenser at the blower.That will bring on the out side unit.R & G will bring on the blower as needed.If you have a variable speed or modulating blower motor Y will be at the curcit board and MUST be connected.

Posted on Sep 07, 2010

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I am trying to wire a Honeywell Vision pro Th8000 series thermostat onto a Weather king heat pump and air handler. The thermostat wiring has r,rc,y,c,o/b, g aux,e,y2andl terminals I understand these but...


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Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
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  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

Jun 02, 2009 | Carrier Heating & Cooling

1 Answer

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On your t-stat you have Y, W1, W2, R, O, G, B or C or X. Y is your cooling circuit and will be the same in the air handler and heat pump unit, use the yellow wire for this circuit. W1 and W2 are your back up elec. or gas heat. Depending on how many kws or heat strips you have and t-stat wires you will put the white wire to W1 in both the t-stat and air handler. W2 is for your second stage back up heat if air handler calls for it, this will be a tan or brown or black t-stat wire and goes to W2 on t-stat and air handler. R is half of your 24v control power from the transformer and is the red wire and goes to the t-stat, air handler, and heat pump. O is for the reversing valve in the heat pump that switches it from heating and cooling. You guessed it the orange wire connect to t-stat and heat pump. G is for the blower and is the green wire to the t-stat and air handler. B or C or X is known as the common which is the other half of control circuit from 24v transform it is the blue wire and goes to the t-stat, air handler, and heat pump.





Oct 09, 2008 | Goodman Heating & Cooling

1 Answer

Thermostat wiring


W is normally for heating and Y is normally for cooling. You must be misreading the literature. If Y and W are jumpered you would have heat and cool at the same time. R terminal is normally the power to the thermostat, Y is to the cooling at the heat pump A/C terminal board. G is for the indoor fan operation at the air handler or furnace. W is for heating and with a heat pump you may have a w2 terminal. W1 would be for the first stage or primary heat. W2 would be for the secondary or backup heat be it furnace or electric.

Jun 16, 2008 | Heating & Cooling

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