Visually inspect wire terminals to locate terminals “C or X” and “R,”
“RH” or “RC”
Determine if the Common Wire (typically blue wire, but not always) is
present and connected to the C terminal:
If Common Wire is connected to C or X terminal, you likely have
24 VAC power available
If your thermostat does not have a Common Wire connected to C
or X terminal or if you have unused wires in the thermostat wire
bundle, test the voltage of unused wires (typically blue wire) to
determine if there is 24 VAC power available
Using a volt meter, touch one voltmeter lead to the metal screw of the
C or X terminal and the other lead to R, RH, or RC terminal.
RC RH
W Y2
Y
G
C
C/X
L
RC
RH
W3/0/B
W2/E
W
Y2
G
C
L
Y
C/X
W2/E
W3/0/B
Voltage readings of around 24V (between 24 to 30 VAC)
means there is power available at the C terminal – proceed
to Step 1 to remove your old thermostat
Voltage readings of around 0V (below 18 VAC) means the
Common Wire is not connected – visit
nvenergy.com/powershift/selfinstallguide
for additional
instructions on how to connect the 24VAC Common Wire at
the HVAC unit
If you can't identify the Common Wire, please visit
nvenergy.com/powershift/selfinstallguide
for further
instructions.
If you determine that the C/X Wire is not connected and are not
comfortable proceeding, please call 855-676-9373 to schedule a
professional installation.
1
REMOVE OLD THERMOSTAT
STEP
Turn off electricity to the HVAC system
CAUTION
It is important to verify there is no voltage at the wall.
Switch OFF power to heating and cooling equipment Locate correct
breaker(s); typically labeled A/C, FAU, or HVAC.
No voltage should be present at the thermostat
Confirm using a volt meter, touch one voltmeter lead to the
metal screw of the C or X terminal and the other lead to R, RH,
or RC terminal.
Voltage readings of around 24V means incorrect breaker has
been turned off. Switch OFF main breaker
Volts
AC
v
ON
OFF
RC
RH
W3/0/B
W2/E
W
Y2
G
C/X
L
Y
v
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