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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8184
Fig. 181. Schematic and hookup of T874K with Q674C. Used in heat pump applications.
Fig. 182. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
FALL
CO
L1
(HOT)
L2
1
1
H2
FALL
H1
FALL
C1
RISE
2
3
6
8
9
10
Y
G
R
W
W2
A
COMPRESSOR
FAULT
REVERSING
VALVE
FAN RELAY
COMPRESSOR
RELAY
TIME
CLOCK
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
OFF
AUTO
COMPRESSOR
FAULT LED (RED)
C1
ANTICIPATOR
H1
ANTICIPATOR
THERMOSTAT
SUBBASE SYSTEM COMPONENT
M18587
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FAN
SYSTEM
SWITCH
COOL
HEAT
H1/C
ANTICIPATOR
H1
FALL
M3951
AUTO
ON
FAN
SWITCH
R
G
L
Y
X
H2
E
W2
B
EM. HT.
LED (YELLOW)
1
2
3
5
4
6
SERVICE
LED (RED)
COMPRESSOR
FALL
AUX. HT.
O
T
OUTDOOR
RESET
EM. HT.
OFF
EM. HT.
W89
HEAT
PUMP
CONTROL
PANEL
COOL/HEAT
H2
ANTICIPATOR
RESET
SERVICE
LIGHT
EM. HT. LIGHT
THERMOSTAT SUBBASE SYSTEM COMPONENTS