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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
191 60-2485—8
Fig. 195. Schematic and hookup of T874G with Q674F. Used in heat pump applications.
Fig. 196. Schematic and hookup of T874G with Q674J. Used in heat pump applications.
H1
FALL
O
G
R
E
L
X
W2
FAN RELAY
COOL
CHANGEOVER
VALVE
EM. HT.
OFF
AUTO
SYSTEM
SWITCH
H1 ANTICIPATOR
C1 ANTICIPATOR
AUTO
ON
FAN SWITCH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
M2974
B
EM. HT.
RELAY
COMPRESSOR
CONTACTOR
AUX. HT. RELAY
1
4
6
8
9
10
H2
FALL
RISE
RISE
CO
C1
"B" RELAY
L1
(HOT
)
L2
1
H2
ANTICIPATOR
2
EM. HT. LED
(RED)
Y
AUX.
HT. LED
(GREEN)
COOL
HEAT
THERMOSTAT
SUBBASE SYSTEM COMPONENTS
COMPRESSOR
FAULT
H1
FALL
O
G
R
E
L
W2
FAN RELAY
COOL
CHANGEOVER
VALVE
OFF
ON
SYSTEM
SWITCH
H1 ANTICIPATOR
C1 ANTICIPATOR
AUTO
ON
FAN SWITCH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
M2975
COMPRESSOR
CONTACTOR
O.D.T.
1
4
6
8
9
10
H2
FALL
RISE
RISE
CO
C1
L1
(HOT
)
L2
1
H2
ANTICIPATOR
2
SUPL. HT.
LED
(RED)
Y
SUPL. HT.
H.C.R.1
H.C.R.1
H.C.R.2
H.C.R.2
H.C.R.3
C
THERMOSTAT
SUBBASE SYSTEM COMPONENTS