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Remove Old Thermostat
Remove the old thermostat from the wall, taking care not to allow the wiring
to fall inside the wall.
Wrap wires around a pencil or similar object to
prevent them from falling into the wall void.
The ST921WF Thermostat IS NOT COMPATIBLE with supply
voltages above 30 VAC. If the old thermostat is connected with
thick wire and wire nuts or voltages higher than 30 VAC are noted
on the connections, DO NOT INSTALL the Thermostat.
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