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Thermostat Wiring Help

Old 10-09-2013, 07:06 PM
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Default Thermostat Wiring Help

I have a Coleman unit with Heat Pump. It had a Coleman analog thermostat that I replaced with a digital LUX TX9600TS. The coleman thermostat had 8 wires connected. I wired the LUX thermostat and the AC works fine. I tested the heat today and the outside fan runs but no air at all coming out of the vents. I only hooked it up this summer so I have never used heat with the new thermostat. I'm thinking I have it wired wrong and that is why I'm here. I will post how the old one was wired vs the new one. Thanks

Coleman 8 Wire:
Wire/ Term
W / W2
G/ G
R/ R
BR/ L
BLK/ B
Y/ Y
O/ O
BLU /X


Lux TX9600 Blue and Brown wire are not connected

Wire/Term

G/G
B/nothing connected
O/O
Y/Y also jumper-ed to W1
R/RC also jumper-ed to Rh
W/W2
A/ nothing connected
Blk/ C
Old 10-09-2013, 07:27 PM
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Typical HP wiring:

Yellow to Y only // no jumper between y and anything else.

red to Rc and Rh (use a short jumper wire)

Green to G

orange to O

W to W1 and W2 or W1 and aux (use a short jumper wire)

your common wire to C (a lot of times system common will be blue)

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digital thermostats with batteries do not require common to be hooked up, since it's unclear if blue or black is your common I wouldn't hook either one up

Remove that jumper from yellow to W1 and hook up the red, yellow, green, orange, and white wires only and try it.
Old 10-09-2013, 08:08 PM
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Thank you baypro , I rewired it and checked the AC and heat and they both seem to be working now.
Old 10-09-2013, 08:11 PM
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Forgot to ask, but the emergency heat will still function as it did with the old thermostat. Not that I want it to have to run in emergency but just in case.
Old 10-10-2013, 04:45 AM
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Most heat pumps have an electric heating element kit added to the air handler when the system is installed. So you have 1 stage of cooling and 2 stages for heat. The white wire energizes only the electric coils. When white is connected to W1 and W2 (or aux, depending on thermostat terminology) it should function like this:

The outside unit will energize the white wire when it goes into defrost so that supply air isn't too cool.

In heat mode, if you adjust the thermostat up 3 degrees or more the thermostat will energize white also to help raise the temperature quicker.

If you set the thermostat to EMER the thermostat disables the heat pump portion and only energizes the white for heating.

------------------------------------

so the jumper between W1 and aux allows one heat kit to function as backup heat as well as emergency heat.

-----------------------------------

also, it's best to kill power to the air handler when messing with thermostat wiring. It's pretty easy to pop the 3a or 5a fuse that's in there.
Old 10-10-2013, 04:41 PM
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Update: I just turned the heat on last night long enough to see if it would blow warm air and it does but the outside fan is not running. I only kept it on for a very short period of time like that. Less than 2 minutes. Is there something else I'm missing or need to check. Thanks
Old 10-10-2013, 08:17 PM
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thermostat wiring only control on outdoor fan is to bring the compressor on is the compressor running? if so is it heating or cooling {is the big copper line on the unit hot or cold? if you are heating and the compressor is running with no outdoor fan the line should be cold as unit is in defrost if line is hot you have fan capacitor or defrost relay problems

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