Sunday, November 21, 2010

How to change old thermostat 2 wire to new thermostat?

The assumption is that this is a heating thermostat!

The wires are connected to the R or RH and the W terminals.

If this is a Cooling thermostat, then the wires are connected to the RC and the Y or Y1 terminals.

This is strictly generic information and may not apply to your situation, more info would be helpful.How to change old thermostat 2 wire to new thermostat?
The new Thermostat will have directions in the package. If not or if you lose them, The red wire in the wall is + and the balck is - .How to change old thermostat 2 wire to new thermostat?
I have a wireless thermostat installed. Never had any trouble with it. It interfaces with a receiver stationed on the furnance unit. No wires.
If your old thermostat only had two terminals, it was either direct current, or heating only or cooling only. You will need to replace with the same type of thermostat. If direct current, check the polarity of the wires BEFORE hooking any up. If it is heat or cool only, it really doesn't matter which side of the switch you put the wires.
Your question is not very clear. http://appliancequickfix.com/

may be able to help you. See if you spot your specific problem there.
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