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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8162
Fig. 151. Schematic and hookup of T874G with Q674F. Used in heat pump applications.
H1
FALL
H2
FALL
CO
RISE
C1
RISE
L1
(HOT)
L2
1
1
2
1
L1
(HOT)
L2
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
OPTIONAL FIELD WIRE JUMPER TO CYCLE W2 WITH H1 IN EM. HT.
(FASTER RESPONSE).
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
M4710
H1
ANTICIPATOR
H2
ANTICIPATOR
C1
ANTICIPATOR
SYSTEM
SWITCH
FAN
SWITCH
AUTO
ON
OFF
HEAT
EM. HT.
AUTO
COOL
EM. HT.
LED
(RED)
EM. HT. RELAY
CONTACT 1
T6031 REFRIGERATON/
TEMPERATURE
CONTROLLER
EM. HT.
EM. HT. RELAY
COMPRESSOR
CONTACTOR
SEQUENTIAL
RELAY
FANREVERSING
SOLENOID
COM
EM.
HT.
FAN
R8233B
YR
G
W
O
CDF
RS
O
G
Y
H
X
W2
R
1
2
4
6
8
9
10
E