Gas and Oil Home Heating Furnaces - Thermostat wiring

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zonabb
10-23-05, 05:45 PM
Given that natural gas went up .50 cents per unit (ccf) here in Bflo, NY in the last month, I went out and bought a programmable thermostat. I don't want to open it and have a return issue since things are packed tighter than Fort Knox. I noticed on the back a diagram showing 3 wires. My thermo now has two wires into it. And my furnace is only 10 months old.

Any insight is appreciated.

Grady
10-23-05, 07:16 PM
Some thermostats need a "common" going to them some do not. If yours shows three wires, R, W, & C, I would bet it needs a common. Look for a thermostat which is battery powered. It should not need a common.
zonabb
10-24-05, 01:29 PM
This thermo is battery powered, as was the old one. Just confused that the diagram on the package shows R, C and W, like you say. If this package wasn't sealed shut, I'd open it!

Grady
10-24-05, 07:03 PM
If the manufacturer has a web address listed on the package, I suggest you visit their web site. If no site is listed, do a search for the manufacturer. Good chance you will find installation & application info on the site.
Jay11J
10-24-05, 09:53 PM
The 3rd wire could be for the fan switch on the t-stat?

is this a forced air system?

What the model # of your new t-stat? and old?????
zonabb
10-25-05, 05:02 PM
Forced air gas furnace, a Goodman 92% efficient, 70,000 BTU that was installed in February.


The t-stat is rite temp, model 8022c, got it at home depot.