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<!-- from fixya rte -->Can I connect a programmable thermostat - Heating & Cooling

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  • Bob Baker
    Bob Baker Nov 30, 2014

    Connect to Coleman Presidential II 7670 model

  • tractorman44
    tractorman44 Dec 02, 2014

    What in specifically are you connecting it to? Gas or electric, Oil or heat pump ?? Single stage heat and cool,or two stage heat and cool. Single stage heat and single stage cool, Single stage heat and two stage cool ??

  • Bob Baker
    Bob Baker Dec 02, 2014

    Connect to Coleman Presidential II 7670 model in a mobile home >gas > no cooling> maybe heat pump > it only has two wires and both are green


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Connect to Coleman Presidential II 7670 model in a mobile home >gas > no cooling> maybe heat pump > it only has two wires and both are green
Dec 02, 2014

A heat pump connected would require quite a few additonal wires and a standard central A/C would require a total of 5 for a good quality programmable with single stage heat and single stage cooling in the circuit.

The two wires you refer to should be all that's required to operate heat only with a standard thermostat. You must do one of two things though to add a programmable thermostat:

1) Either select a programmable stat that operates on battery power alone, necessitating periodic battery replacement or,

2) Prepare yourself to pull at least one additional wire from the furnace to the thermostat location.

The two wires, if utilizing a battery powered stat can go to either R or Rh and to W. Either wire to either terminal because you are only completing the one circuit. Ideally you would want to locate which of the two is the one directly off of the ' hot' side of the transformer.

If you opt to pull an addiional wire for a thermostat of a superior quality, you will HAVE to determine which of the two green wires is the hot side of the transformer and it MUST be connected to R or Rh. The second green wire goes to W. The third wire that you had to add must go to the C thermostat terminal. That same wire has to be connected to the neutral side of the transformer to complete the circuit. Most programmable t-stats require both 24v hot and 24v neutral to operate, then have the battery for back up during a power failure whereas the battery powered stat runs entirely on the battery and not 24v from the furnace.

If you are unable to determine the wire connections as outlined above, do not attempt it....remember you are working on an LP furnace !!! Any doubt on the ability to ascertain correct locations for the terminations requires you to contact a qualified technician as there is only so much that can be gleaned by a person in a remote location from a typewritten description of the situation.

Posted on Dec 03, 2014

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