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•Turn off power to the HVAC system
•Open the top cover of your existing thermostat and examine its
current wiring. Standard thermostat cable is color coded and
should be connected as follows:
i. Non-heat pump systems:
1. 24VAC return: Red wire, terminal R
2. Fan: Green wire, terminal G
3. Heat: White wire, terminal W or W1
4. A/C: Yellow wire, terminal Y or Y1
ii. Single-cycle heat pump systems
1. 24VAC return: Red wire, terminal R
2. Fan: Green wire, terminal G
3. Auxiliary heat: White wire, terminal W or W1
4. A/C: Yellow wire, terminal Y or Y1
5. Change-over: Orange wire, terminal C/O or O
There may be an additional wire, usually Blue, which is either
not connected (older thermostats), or connected to the 24VAC
Common and is used to supply AC power to modern, digital
thermostats.
If this wiring map is followed in your current thermostat,
everything is OK. On rare occasions, the previous installer may
not have followed this wiring map and the terminals listed
above are connected to wires of different colors. In these cases
it is important to either write down what color wire is connected
to each thermostat terminal (as you will need to connect
everything the same way on your housEvolve Thermostat
Module); or, change the wiring connections at the HVAC
control board so that the standard mapping applies and you
won’t have to worry about it in the future.
