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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8148
Fig. 130. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
H2
FALL
H1
FALL
C1
L1
(HOT)
L2
1
2
2
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
FACTORY-INSTALLED JUMPER.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
H1/C1
ANTICIPATOR
H2 ANTICIPATOR
SYSTEM
SWITCH
FAN
SWITCH
AUTO
ON
OFF
HEAT
EM. HT.
COOL
FAN RELAY
EM. HT. RELAY
COOL
CHANGEOVER VALVE
COMPRESSOR
CONTACTOR
M1628A
COMPRESSOR
FAILURE
C815A OUTDOOR
THERMISTOR
SYSTEM
LED (GREEN)
CHECK
LED
(RED)
AUX. HT.
LED
(YELLOW)
2
3
4
5
6
11
12
RESET
Y
T
C
X
E
W1
R
G
O