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Thermostat Power
The thermostat can be powered by either 24VAC from the HVAC system or from four (4) type AA
internal baeries. DO NOT use this thermostat for line voltage controls (120/240VAC).
The C Wire
If the 24VAC common wire (usually blue) is present and is connected to 24VAC common at the HVAC
system end, the thermostat can be powered from the HVAC system and baeries are not required. If
there is no common wire, baeries are required.
24VAC Power
Powering the thermostat with 24VAC power requires both the 24VAC “C” common wire (typically a
blue wire) and the 24VAC ”R” return wire (typically a red wire).
Baery Power
Powering the thermostat from baeries does not require a “C” wire connecon.
DO NOT install baeries if the thermostat is powered by 24VAC. They are not required for backup.
If the thermostat is powered by baeries, the thermostat will operate for approximately (2) two
years on four (4) AA Alkaline baeries depending on the frequency of user operaons and backlight
operaon. Always use Alkaline baeries and replace in complete sets of four (4) at a me.
Z-Wave Operaon when Baery Powered
IMPORTANT: If the thermostat is installed on a Z-Wave network, while it is baery powered, it will
NOT work as a Z-Wave repeater.
CAUTION: Do not install baeries and temporarily power the thermostat from 24VAC to include onto
a Z-Wave network. Shortened baery life may occur when 24VAC power is removed.
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