Honeywell T874G Installation Instructions Manual page 10

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