Air Conditioning - Please help with thermostat wiring

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Pei Pei
01-16-08, 01:01 AM
I was changing my old thermostat Honeywell T8195b with Hunter 44155C, but I forgot labeling the wire. I only have blue,yellow(it was connect to 2 terminal), orange,red,brown/grey wire that connected to old thermostat and white one (wasn't connected to thermostat). I don't know how to connect the wire even to connect it back to old ones. I have Carrier 40AQ030300BB. Could someone help me with the wires please. I need the heat, it's cold in the night.
Thanks you.


pflor
01-16-08, 04:45 AM
The 40AQ is an indoor fan-coil unit which comes with strip heaters.

You do not tell if you also have a heat pump, so I will assume that you don't...that your heat is exclusively from the strip heaters and that you also have an outdoor condensing unit (you don't mention this either) for summer cooling.

The pic below shows the subbase for the thermostat you have (top figure) and the wiring between t-stat, 40AQ and contactor coil of the outdoor condensing unit...the pictures below should guide you thru a successful re-wiring.

Please note that if you do NOT have a heat pump, terminals O and B on the subbase do not get any wires connected to them.

http://i261.photobucket.com/albums/ii64/pflor_bucket/th_peipei.jpg (http://i261.photobucket.com/albums/ii64/pflor_bucket/peipei.jpg)

DONISIA25712
03-07-09, 12:37 PM
The 40AQ is an indoor fan-coil unit which comes with strip heaters.

You do not tell if you also have a heat pump, so I will assume that you don't...that your heat is exclusively from the strip heaters and that you also have an outdoor condensing unit (you don't mention this either) for summer cooling.

The pic below shows the subbase for the thermostat you have (top figure) and the wiring between t-stat, 40AQ and contactor coil of the outdoor condensing unit...the pictures below should guide you thru a successful re-wiring.

Please note that if you do NOT have a heat pump, terminals O and B on the subbase do not get any wires connected to them.

http://i261.photobucket.com/albums/ii64/pflor_bucket/th_peipei.jpg (http://i261.photobucket.com/albums/ii64/pflor_bucket/peipei.jpg)

Any chance you still have this photo somewhere? I need to wire my new thermostat today...


Jay11J
03-09-09, 08:57 AM
Any chance you still have this photo somewhere? I need to wire my new thermostat today...

This an old thread, be best of you started a new one over in the t-stat section (http://forum.doityourself.com/thermostatic-controls-333/) of this board.

Before you post, I'd like to know what your make, and model of your heating and cooling equipments.

See you over there! :)

jobtrioPrez
03-26-09, 11:50 PM
Real quick, the standard low voltage wiring color coding that most, but not everyone, follows is:

red = voltage (R)
brown = voltage neutral (c)
white = first stage of heating (W1)
yellow = first stage of cooling (Y1)
green = fan (G)

. . . and then, any other colors tend to follow less of a convention.