O/B - reversing valve
Y1 - Cooling
Low Stage
Rc - 24 VAC, from cooling equipment
Rh - 24 VAC, from heating equipment
W - Heating
C - Common 24 VAC
G - Fan
Y/Y2 - Cooling High or Single Stage
A09271
Fig. 3 - Terminal Designations
!CAUTION
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in equipment damage or improper operation.
Improper wiring or installation may damage the thermostat. Check to make sure wiring is correct before proceeding with installation or turning on unit.
9.Push any excess wire into wall and against mounting base. Seal hole in wall to prevent air leaks. Leaks can affect operation.
10.Snap case back together. Attach thermostat to backplate by inserting tab on bottom edge and hinging up until top snap secures. See Fig. 4
9