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Prepare the wires
Follow these guidelines for safe and secure
wire connections:
• Ensure the wires are a proper
gauge between 18-24 AWG.
• Make sure wires have exposed
straight ends about 1/4" long.
! CAUTION: Verify that the system is 24 VAC.
If the old system is labeled as 120 or 240 volts or
has wire nuts, the system is high voltage. Do not
install the thermostat to a high voltage system.
Contact a local HVAC professional for help.
Install the back plate
Use the bubble level provided on the back plate
as a guide. Mark where the screws will go with a
pencil through the screw holes on the back plate.
Ensure the top of the back plate is facing up.
If necessary, use the trim plate to cover up any
marks or holes left from the old thermostat.
Attach the trim plate before securing the
back plate to the wall.
If additional support is necessary, drill holes with
a 1/4" drill bit and tap in the drywall anchors.
6
Installation
Wire your new thermostat
Connect the wires to the new thermostat.
If you have extra wires, do not connect them
to the new thermostat. Please contact your local
HVAC professional for additional assistance.
• If you have R, connect it to RH.
• If you have RH and RC, you do not need a
physical jumper to connect the two terminals.
RH and RC are connected by a digital jumper.
• Z1 or Z2 can be used for W3, H, DH, or EX.
NOTE: If you have a 2-wire hydronic heating system,
you may need to add the power resistor to the
system. Connect this resistor at your heating
equipment (not the thermostat) between the
C and W terminals. Additional information
about the power resistor can be found in the
Troubleshooting section.
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