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19 69-2718EF—03
Installing your thermostat
Alternate wiring key (heat pump system only)
Do not use K terminal. For future use.
If old thermostat has separate wires on AUX and E, place both wires into the E/AUX terminal. If
old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. No jumper is
required.
If your old thermostat had an O wire and not a B wire, attach the O wire to the O/B terminal.
If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If
another wire is attached to the C terminal, check wifithermostat.com for help. Attach the O wire
to the O/B terminal.
If your old thermostat had separate Y1, W1 and W2 wires, check wifithermostat.com for help.
If your old thermostat had both V and VR wires, check wifithermostat.com for help.
Leave metal jumper between R and RC terminals in place.
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