Honeywell T874G Installation Instructions Manual page 7

THERMOSTAT
H1
ANTICIPATOR
C ANTICIPATOR
H1
C
FALL
H2
ANTICIPATOR
H2
FALL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE JUMPER WHEN W1 RELAY IS USED.
3 FACTORY-INSTALLED JUMPER.
Fig. 8. Internal schematic and typical hookup for T874R/Q674L in heat pump system. Includes CHECK, EM. HT.
T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES
1
2
3
SYSTEM
SWITCH
4
EM. HT.
5
6
11
and AUX. HT. LEDs.
SUBBASE
FAN
SWITCH
AUTO
ON
HEAT
OFF
COOL
7
SYSTEM COMPONENTS
W3
O
COOL CHANGEOVER
VALVE
L
COMPRESSOR
MONITOR
G
R
W2
EM. HT.
AUX. HT. RELAY
LED (RED)
E
AUX. HT.
LED (GRN)
EM. HT. RELAY
X
3
HEAT
CHANGEOVER
X2
VALVE
B
W1 RELAY
W1
COMPRESSOR
2
RELAY
Y
W3 RELAY
FAN RELAY
L1
(HOT)
L2
1
M5067
69-0268—11