White Rodgers UNP310 - Removing the Old Thermostat; Turn Off System Power

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3. REMOVING OLD THERMOSTAT
3.1 Turn off power
To ensure the power to your heating and cooling system has been turned off, try to turn on heating or cooling by
changing the temperature on your old thermostat.
or
Topreventelectricalshockand/orequipmentdamage,disconnectelectricalpowertothesystematthemainfuseorcircuitbreakerbox,orby
ippingaswitchattheairhandler.Donotrestorepoweruntilinstallationiscomplete.