I am replacing a thermostat and the 1 being replaced has 4 wires on it but the new thermostat only has 2... do I connect the whites together and run the 2 blacks from the thermostat to complete the circuit?

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Originally Posted by artosie

I am replacing a thermostat and the 1 being replaced has 4 wires on it but the new thermostat only has 2... do I connect the whites together and run the 2 blacks from the thermostat to complete the circuit?

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Without more details on the thermostats it is difficult to say.
It seems to me that the one you want to install is a either a simple (mercury or spring) model, or a digital one.
The digital thermostate may be polarisation sensitive, so be careful.
As to the wires to be used : it depends on what type the old thermostate is, and where it is using these 4 wires for...
;)

The box which houses the thermostat has 2 lines running into it,
1 from the electrical panel and 1 to the heater.
The thermostat being removed is a spring type and has the 2 blacks on one side and the 2 whites connected to the other side of it... the thermostat being installed is a spring type and has the 2 wires out the back of it.
For previous heaters I have installed I completed the circuit by connecting the blacks to the thermostat and joined the whites together. I hope this explains it a little better

artosie, sounds like your method should work.

Great! I am going to try it in an hour... I will reply here and let you know if it worked..

Thanks again

Do you have both heat and AC in your home? I think you bought the wrong stat if your old one had 4 wires. This may help but please answermy question. https://www.askmehelpdesk.com/heatin...tml#post268211

Ballenger, I was thinking the same thing, but since he said 2 in and 2 out, Not 4 in, was thinking more Line in and load out. I'm thinking this is #12 or bigger, not Control wires.
Curious if he has Heat and Cooling, and size of the wires. Take Care