White Rodgers UNP310 - Identify Special Wires and Jumper

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Do you have a “B” wire?
Labelingthe“B”wirecanbetricky.Itcouldbelabeledas“C”or“O/B”dependingonwhetheryouhavean“O”wire
connectedtoyouroldthermostat.Pleasepayattentionandfollowtheasterisk(*)commentsbelowwhilelabelingit.
*Label“B”as“C”onlyiftheoldthermostatalsohadawireinthe“O”terminalblock.Iftherewasnowireinthe“O”
terminalblock,labelthewireas“O/B”
**OnheatpumpsystemswithseparateW2andEwires,labelbothwiresW/E(2wiresononeterminal)
3.4 Identify jumper wire
ForterminalRCandRH:
On your old thermostat, if… Then, on your new thermostat…
TerminalRCandRHareconnected
with a jumper wire
LeavetheRC/RHjumperwireinitsplace
There’sonlyoneRwire(RC,RH,RorR5)
coming out of the wall
LeavetheRC/RHjumperwireinitsplace
Two separate R wires come out of the wall, and
they are NOT connected by a jumper wire
ClipthejumperwirebetweenRCandRHonthe
back of the new thermostat