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Installing your thermostat
Alternate wiring key (heat pump system only)
1
Leave metal jumper between R and RC terminals in place.
2
If your old thermostat had both V and VR wires, check wifithermostat.com for help.
If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If
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another wire is attached to the C terminal, check wifithermostat.com for help. Attach the O wire
to the O/B terminal. Set System Function 0190 to 0 (see page 55).
If your old thermostat had an O wire and not a B wire, attach the O wire to the O/B terminal.
4
If your old thermostat had separate Y1, W1 and W2 wires, check wifithermostat.com for help.
This is the system monitor. If the monitor finds a problem, you will see a red light in the upper
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right corner of the thermostat (shines through the cover).
If old thermostat has separate wires on AUX and E, place both wires into the E/AUX terminal. If
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old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. No jumper is
required.
7
Do not use K terminal.
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