White Rodgers UP310 - Advanced Information and Support; Specifications; Troubleshooting Common Issues

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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.
*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