Carrier 25HCA Installation Instructions Manual page 10

HP THERMOSTAT
24 VAC HOT R
24 VAC COM C
W2
HEAT STAGE 2
COOL/HEAT
Y
STAGE 1
G
INDOOR FAN
O
RVS COOLING
EMERGENCY
E
HEAT
ODT
EHR
SHR
Fig. 12 --- Generic Wiring Diagrams
(See Thermostat Installation Instructions for specific unit combinations)
Speedup Quiet
Pins Shift
Fig. 13 --- Defrost Control
HEAT
TYPICAL
PUMP
FAN COIL
R
C
*
W2
*
E
*
W3
G
*
IF AVAILABLE
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY
HK32EA003
Defrost interval
DIP switches
10
R
C
W2
Y
O
A02325 / A97413
A05378