Honeywell T874G Fig. 13. Wiring connections., Fig. 12. Subbase components and leveling procedure.

69-0268—11 10
T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES
M1627A
R
W
E
X
L1
(HOT)L2
COOL
EM. HT.
HEAT
SYSTEM
SWITCH
AUTO
ON
FAN
SWITCH
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE JUMPER FOR INDEPENDENT CONTROL OF W AND E TERMINALS.
1
AUXILIARY
HEAT
LED
(YELLOW)
C
T
COMPRESSOR
CONTACTOR
Y
H2
ANTICIPATOR OFF
FALL H2
H1/C1
ANTICIPATOR
FALL
CHECK
LED
(RED)
2
4R
SEQ 1
4R
2
HPS 4R
5R
4R
EM. HT. RELAY
SEQ 2
3R
G
O
FAN RELAY
CHANGEOVER
RELAY
SYSTEM
LED
(GREEN)
H1 C1
Fig. 11. Internal schematic and typical hookup for T874R/Q674L in heat pump system. Includes AUX. HT., CHECK
and SYSTEM LEDs.
Fig. 13. Wiring connections.
SPIRIT LEVEL
MOUNTING
HOLES (2)
M927
TOP
MOUNTING
HOLES (2)
WIRING
TERMINAL
THERMOSTAT
CABLE OPENING
TO SPRING FINGER
CONTACTS ON THE
THERMOSTAT
(UP TO 12)
POST (2) FOR
MOUNTING
THERMOSTAT
Fig. 12. Subbase components and leveling procedure.
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. (8 mm)
FOR WRAPAROUND–
STRIP 7/16 in. (11 mm)
SUBBASE TERMINAL SCREW
M928
BARRIER