Honeywell Q674F - Manual (Page 7)

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