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How to wire condenser and air handler to the t-stat

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  • Robert Moller
    Robert Moller May 19, 2011

    How about make and model number of all involved.

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Assuming this is a standard unit the thermostat connections you will use: Y, R, G, W and possibly C.

Run two conductor thermostat wire to the condenser. The condenser will have two wires to connect. Connect the two conductors to the condenser wires and run them in to the air handler.

At the air handler, connect the two condenser wires to: Y (yellow) and C

Run 4 or 5 conductor thermostat wire from the air handler to the thermostat. At the thermostat, connect the yellow wire to Y, the white wire to W, the green wire to g, and the red wire to r.

At the air handler, connect the thermostat wires: White to w1, yellow to Y, green to G, and red to R

*Y will now be connected to the thermostat and the condenser
*If you have 5 conductor wire to the thermostat, connect the last wire (which is probably blue) to C
At the air handler, connect the last wire (blue) to C. This will enable you to have 24 volts at the thermostat in case the thermostat actually requires 24 volts to operate it.

R=hot
G=fan
Y=cool
W=heat

Posted on May 19, 2011

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Im trying to wire a goodman 5 wire air handler to my 4 wire t-stat and 2 wire condenser can u help


remove the jumper from the t-stat between rh & rw then the stat will be 5 wire

Apr 02, 2011 | Goodman Heating & Cooling

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Our Carrier central air is unresponsive, nothing at all, no noises, air handler and condenser unit will not turn on, please help me before I lose more weight in my 150 degree attic. The serial # for the...


I think you need to slow down and start fresh.
1) You have 115v at Transformer-You are reading from Red to White
on windings?

2) If that checked out OK are you reading 24v out of Transformer?
3) If yes, remove thermostat wires and put a jumper wire between
R and G. Put the Blower Door Back ON and turn on power
hopefully your fan will come on.

4) If the fan comes on, move the jumper between R and Y, put the
blower door back on and turn on power, indoor fan should come
on as well as the outdoor unit. If the happens you have a problem
with the low voltage wire being broke or a defective thermostat.

5) If none of the above happens and you do not have 24v Between
R and Y or R and G, but you have 24v on the secondary side
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Jul 20, 2010 | Heating & Cooling

1 Answer

T stat wiring in air handler


Hi, normally they don' t have 2-toned striped wires in a thermostat cable. They must have used some other 18 gauge wire. If this is a gas fired indoor unit, the wires are Red to R, Yellow to Y, G to to green, and white to W. If its a heat-pump, no gas, you will have Red to R, W to W-1 if you have heat strips for second stage heat, G to fan, green, B is blue for the reversing valve, 0 will not be used on a Ruud. You may need to go to the control panel on the outdoor unit to see how they have wired the condenser, as you never no what colors they have picked to use, what ever suits them. You may have a black or brown for common if used, or for emergency heat. Gas air handlers are much easier to wire at the stat then a heat pump, so you will need to check what they used at the outdoor unit. They didn't use regular stat wire as it does not have stripes on it.Please do this and draw your self a diagram so you will know. Most all heat-pumps wire differently, at the stat depending on the kind, and at the condenser. I hope I have been of help to you on this as it is important to get it right, and it sound as tough you are familar with wiring. Please rate me on this and be kind as I know you will. Please keep me posted on the outcome or if you need more help.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
PS You may not need any of the striped wires as all wires are not used. You will need to look at the outdoor and indoor control board.

Jul 17, 2010 | Ruud UBHC Air Conditioner

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Change out problem


AIR HANDLERS DO NOT ENERGIZE REVERSING VALVE , THE THERMOSTAT DOES THE JOB THROUGH THE O  OR B TERM TO THE OUTSIDE UNIT. IF YOU HOOK UP TO O TERM AND HEAT COMES ON WHEN YOU SET AC ON THEN SWITCH TO B TERM ON STAT. YOU SHOULD HAVE O TERM ON CONDENSER OUTSIDE AND YOU USE ORANGE WIRE IF YOU HAVE ONE. IF NOT USE UNUSED WIRE IN 6 WIRE STAT HARNESS.

Apr 21, 2010 | Heating & Cooling

1 Answer

Heat pump goes str8 to heating strips compressor does not run in heat mode pump was manufactured in 03 installed in 07 and has sat dormant till now could it be wired wrong it is a ruud split unit with...


I think that you have the right idea. The wiring is probably wrong. If you can trace the low voltage wires to the air handler. make sure that the Y1 wire on the t-stat is going to Y1 on the hair handler and then to the condenser. The Y2 wire should be going to Y2 on the air handler and probably does not continue out to the condenser. The Y2 should be going to the contacor that brings on your backup heat. It seems like Y1 and Y2 are reversed somewhere.

Nov 14, 2009 | Heating & Cooling

1 Answer

My goodman air handle is run on e-heat only and will not turn off ,also the outside unit will not turn on , I put a new themostat this didn't help I have a goodman heatpump


Heat-Pumps can be temper mental. Sounds to me like your air handler is running on emergency heat, due to a problem with the condensing unit.You have heat strips in the air handler in case the outdoor temp. gets to cold and the heat pump cant keep you're home warm.Also, if you loose a compressor, it will go into emergency heat. If you have lost the compressor for one reason or another, lets say a locked rotor, the compressor would draw L.R.A. (Locked rotor amps) and cause the circuit breaker to trip. Check this.As for the air handler running all the time, you said you replaced the stat? When you removed the control wiring from the stat, did the fan shut off? I wish I were on site to help you, but all I can do is offer you some advice. With the power off to the air handler, go to the stat and remove the red and green wires. Turn power back on and see if it stops running. If it stops, then it sounds like the new stat is also faulty? If it continues to run, check the wiring in the air handler to make sure the red and green are not touching somewhere, and also check the control wiring on the outdoor unit for the same problem. Do you have any dogs that may have chewed into wiring? If so, check all outdoor t-stat wiring. There are so many things it could be and I hope very much I have helped you with solving this online, which can be difficult. You may also have a faulty defrost board. Try to do what I have asked of you.
Good Luck, Sincerely, shastalaker7

Oct 16, 2009 | Goodman GMS90703BXA Heater

2 Answers

Problems with low voltage control wiring turning on cond. unit


Only 2 wires going outside.
Yellow from the thermostat and the common wire from the lv side of the transformer.

Apr 28, 2009 | Heating & Cooling

1 Answer

Wiring diagam for goodman heatpump and air handler to thermostate


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

Air handler


This should be doable: First get pen and paper-start at the furnace, theres a group of 5-8 wires leaving the furnace anfd going to the thermostat and a group of 2-3 going to the condenser outside that all need to be identified and the location in the furnace recorded if your furnace has a control board simply right the letter and the corresponding wire color:and whether it belongs to the condenser grp or the T-stat grp.

Furnace
R-red-to t-stat
C-yellow to cond
Y-red to cond and yellow to t-stat
G- green-to t-stat
W- white- to t-stat

If you dont have a circuit board youll be doing the same thing but using the components rather than letters;

Transformer 24v- red to t-stat
transformer 24v com -yellow to cond
Red from cond connected to yellow from t-stat
fan relay - green to t-stat
gas valve - white to t-stat

K then go to you t-stat and simply connect the corasponding component or leter to the thermostat gterminal

Cond Furnace Thermostat

yellow com- blue -C or B
gas valve or w-white -W
fan relay or g -green -G
trans 24v or R -red - R
red connection to cond or Y on board -Y
Hope this helps.

Jun 12, 2008 | Quasar HQ2052UH Air Conditioner

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