69-2421ES—03 ii
Quick Installation Guide
Identify System Type
This thermostat is compatible with the following systems:
Gas, oil or electric furnace•
Central air conditioner•
Hot water system with or without pump•
Millivolt system•
Central heating and cooling system•
Heat pump without auxiliary/backup heat•
Heat pump with auxiliary/backup heat•
Do you need assistance?
We are here to help.
Call 1-800-468-1502.
This thermostat cannot be used on multistage systems.
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