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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7768
Experience:  Furnace, A/C and heat pump specialist.
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I have a ct03ts21 bought a used one at yard sale with no

Customer Question

I have a ct03ts21 bought a used one at yard sale with no manual .heat only 2 wire I'm not sure where do I land my wires .please
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Does this thermostat have a place for batteries?

Expert:  airheatman replied 1 year ago.

If the thermostat has batteries, you will simply connect Red to R and Black to W2.

If no place for batteries, you will need to run a third wire from C in furnace to C on thermostat to power the thermostat.

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