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Bluenoser60 09-29-2011 02:56 PM

Goodman gas question
I have a new goodman up flow. 2stage variable furnace. Can I just hook up the two thermostat wires off of my existing battery powered programable thermostat to the furnace and to which connectors. Thanks.

sammy37 09-29-2011 06:54 PM

Depends on which model you have, some of the two stage Goodmans dont actually use a two stage stat. Which model do you have? What does your manual say?
If it doesnt require an actual two stage stat, then you will hook your wires to the R and W terminals on the furnace and adjust the dip switches accordingly for timing between first and second stage.

Bluenoser60 09-29-2011 07:31 PM

Its a GMVC95

sammy37 09-30-2011 09:32 AM

You need a two stage stat.

You will need at least four wires between your furnace and thermostat.


Bluenoser60 09-30-2011 02:52 PM

Ok so if I just have the two wires hooked up to r and w1 the furnace will act as a 1 stage?? until i get the proper thermostat.

beenthere 09-30-2011 07:50 PM

Get the communicating thermostat that is made or that furnace.

For temp use, just 2 wires are ok.

sammy37 10-01-2011 10:38 AM

I was doing some research on that unit last night and like Beenthere says, the communicating stat would be best.
For now, the manual says to use R and W2 and set the dip switch for high stage.

Bluenoser60 10-02-2011 09:40 AM

Thanks for help!! This is a great site.

What I have done is set up the thermostat (2 wire) to R and W1
Also turned dipswitch on S1 (thermostat) to off.
The furnace starts up fine but will wait until a cool day to see it go through a full heating cycle.
Also I plan on picking up a 2 stage stat and installing it when I get a chance

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