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Step 1. Switch off your HVAC system
Before you start, please switch off your HVAC system. Adjust the temperature in
your old thermostat to double check the system is off.
Step 2. Remove the old thermostat
Remove the old thermostat cover from the wall, keep the wallplate with wires.
Do not remove
the wallplate
Old thermostat
Cover
Step 3. Check the old Thermostat's backplate
If you find a thick wire with wire nuts, or if your old system is using 120v or 240v,
it will not be compatibled with PCT503. If all good, please continue to the next
step.
Installation Guide
3
