Honeywell Tradeline T874A-F Installation Instructions Manual page 4

Fig. 8—T874A-D/Q674A in standard heating/cooling system.
Fig. 9—T874C,D/Q674B in standard heating/cooling system with separate transformers for heating and
cooling.
THERMOSTAT
H1
FALL
H1 ANTICIPATOR
H2
FALL H2 ANTICIPATOR
C1
RISE
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1
2
60-1165—6
1
4
6
8
9
10
11
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER RH, RC FOR SINGLE TRANSFORMER.
SUBBASE
3
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
HEAT
OFF
COOL
3
OPTIONAL LED ON SOME MODELS.
4
SYSTEM COMPONENTS
RH
HEAT RELAY 1
W1
HEAT RELAY 2
W2
HEAT CHANGEOVER
VALVE
B
X1
O
COOL CHANGEOVER
VALVE
G
FAN RELAY
2
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
RC
1
L1
(HOT)
L2
1
L2
L1
(HOT)
M933C