Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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I need a 24 volt wiring diagram for a typical gas heating and air conditioner system

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R- REd
C- Common
Y- Outdoor unit
W- Heat
G- Fan

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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My Home AC blows hot air


You need to check to see if you have 24 volt signal from thermostat to your reversing valve. To go into cooling mode the reversing valve needs to be energized. Orange is normal color of the reversing valve power supply. On your unit will be a reversing valve which looks like a pipe with 3 pipes attached to one side and 1 pipe attached to the other side. On the side of the the reversing valve will be a coil with a 2 wire connection. This coil needs 24 volts applied to shift unit into cooling mode. In your thermostat wire bundle where it is connected, check for voltage between common and the orange wire. If it does not have 24 volts with the thermostat in cooling mode, you have a break in the line normally a connection on the orange junction inside your air handler or your thermostat orange wire is loose. Keep checking for 24 volts available until you find the source of the loss. If you have 24 volts at the reversing valve, you can check to see if the valve is working by unplugging the 2wire connection on the side of the valve, if it clicks its powered if not and 24 volts available then the coil needs replaced.
Any more than this you will need a professional tech to troubleshoot and fix.
Hope this helps.

Jun 21, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Wiring diagram RUUD UAPA-036JAZ


the condensor gets 240 volts a-c and 24 volts a-c to control contactor. pretty straight forward on this 3 ton unit. the 240 volts comes off breaker box and the 24 volts comes off thermostat and common of transformer.

Jun 10, 2014 | Ruud Heating & Cooling

1 Answer

Need to know how a mobile home split system is wired with just ac and 15 kW heat stripesqqq


you have to have 240 volts for power. 24 volts to operate cool and heat. thermostat feeds color code white to heat yellow to cool green to fan. think of the thermostat as a light switch. transformer in system feeds common to different controls & usually red to thermostat which is then switched to what it is set for.

May 13, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

The heat pump wont turn on


6f159214-5171-4c22-9fa7-538aa50dd85d.png499c315e-a57b-4d72-acc6-4e8006d84978.jpg
First step is go to your thermostat and turn the Fan switch from AUTO to the ON position, if the indoor blower runs you have proven that you have both high and low voltages and no need to check breakers, and fuses both high and low voltage.

If the Fan does not come on then you need to determine whether you have high and low voltage, the high voltage may have a time delay fuse as well as a beaker, these fuses are located at the electrical disconnect typically within 3 feet of the unit, inside it in a plug/fuse holder that must be replaced in the correct position as 180 degrees off = OFF or no power.
If you do have high voltage the next thing to check is the 24 volt control voltage from the transformer in the heater.
There will typically be a 3 to 5 amp automotive type fuse located on the circuit board located in the heater, this is often the reason for no 24 v control voltage.
These 2 diagrams demonstrate a heat pumps wiring. if split type system.

Oct 10, 2013 | Heating & Cooling

1 Answer

Air conditioning thermostat not functioning


ab302475-b998-41c7-9c7c-4e106b68e0be.pngGo to your thermostat and look at the FAN switch, it will be in the AUTO position typically.
Set the FAN switch to the ON setting,
by doing this if the fan motor operates you know that the High voltage & the low voltage (24 volt control power) are present.
This saves you from having to go to the breaker panel and checking / resetting the breaker as well as checking the Transformer and automotive type 3 amp control circuit fuse (generally on the circuit board).

If you do not get any fan operation by switching the fan switch to the ON setting, you then will have to determine if the breaker, transformer and aforementioned 3 amp fuse are all good.

You will need a volt meter to test further.
At the thermostat remove the cover thus exposing the thermostats sub base and assorted circuits/wiring.

RED or R
Red is the 24 volt "hot leg" of 24 volt power which originates at the transformer. Red enters the thermostat on the Red or R terminal, some thermostats will have an RC and an RH terminal, these are jumpered together on single transformer systems as they are for Red Cool and Red Heat, without a jumper wire on RC and RH, the Red "hot leg" of the 24 volt control voltage will only energize the terminal its wired to, some stats are battery powered and do not use the transformers 24 volt power (parasitically) to power the thermostat.
If the thermostat is powered by the transformers 24 volt power, there will be a "COMMON" wire on the common terminal of the thermostat, this is the other side of the 24 volt power from the transformer, the side opposite from RED the 24 volt "hot leg"
Common is called common as its the side of power that EVERY
24 volt circuit terminates, or completes its circuit, thus the COMMON designation.
During a Heat call the 24 volt hot leg is sent out via the white/heat terminal to the gas valve etc.
So between terminals Common & White , it should read 24 volts during a call for heat.
Same for Fan which is the Green or G terminal,
Same for Cool which is the Yellow or Y terminal.
If you have no power to these terminals when calling for heat or cool or fan then yes the thermostat is defective and requires replacement.
DO NOT let the RED wire touch ground or the COMMON terminal, this is a direct short and blows the fuse or transformer
if not equipped with fuse protection.

Normally you should read 24 volts between RED and COMMON

Aug 01, 2013 | Goodman CKL36AR36 Air Conditioner

1 Answer

I have a Ruud/Rheem gas furnace. The previous owner jury-rigged the transformer to exclude the heat source. As per the wiring diagram, I've sorted out the wiring from the thermastat to the...


It doesn't make any difference if you only have two wires from the Air Conditioner. I would put red on Y and white on C ..... All the air conditioner needs is a 24 volt Common wire and a 24 volt Power wire to pull the compressor contactor in......

May 28, 2011 | Heating & Cooling

1 Answer

Air conditioner wiring diagrams


What brand of A/C is it? Are you looking for the thermostat wiring? Different Brands use different wiring, but the usual is as follows:
R terminal at furnace is 24 volt Hot
W is the control for the heating cycle
G is used to start the furnace blower
Y is used to start the outdoor A/C
B or X depending on Brand is the 24 volt common

Yellow and B or blue is the other wire that goes to the outdoor unit
If you want more info, I need Brand, and type of unit, gas furnace and A/C, electric furnace and A/C, or is it a heat pump for the outdoor unit?
Hope this helps./
Sincerely,
Paul Gibson

Mar 29, 2010 | LG LWHD1800R Wall/Window Air Conditioner

1 Answer

I tring to change thermosat I can not remeber what color go where


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Heating & Cooling

1 Answer

Trying to figure out thermostat wiring diagham on a split system


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Jan 05, 2010 | Heating & Cooling

1 Answer

Old a/c package unit add on heat


check your wiring coming from the thermostat should have 24 volts at common terminal and W terminal W is usually used for the heating side. once this is working check to see if you have 24v between common and G which is usually used for the fan motor. if that is good make sure you have full high voltage going to the motor itself find its wires and where they are connected. if it was a low voltage issue and you dont have the 24 volts somewhere in there i was talking about try rewiring the system according to the OEM wiring diagram. You can probably get one on the internet if you google your model number off the unit and its make.

Sep 20, 2009 | Weather King 10AJA2501AH Air Conditioner

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