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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8196
Fig. 205. Schematic and hookup of T874H with Q674C. Used in heat pump applications.
Fig. 206. Schematic and hookup of T874J with Q674J. Used in heat pump applications.
H1
FALL
G
R
X1
L
Y2
OFF
AUTO
SYSTEM
SWITCH
H1 ANTICIPATOR
C1 ANTICIPATOR
AUTO
ON
FAN SWITCH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
LEDS ON SOME MODELS.
M2983
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
4
6
8
9
10
RISE
RISE
CO
C1
2
LED
(RED)
Y1
C
FAN RELAY
COMPRESSOR
CONTACTOR
L1
(HOT)
L2
1
3
X2
LED
(RED)
2
2
COOL CHANGEOVER
VALVE
H1
FALL
Y
G
R
E
L
W2
FAN RELAY
COMPRESSOR
CONTACTOR
OFF
ON
SYSTEM
SWITCH
H1 ANTICIPATOR
C1 ANTICIPATOR
AUTO
ON
FAN SWITCH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
M2984
THERMOSTAT SUBBASE SYSTEM COMPONENTS
COOL
CHANGEOVER
VALVE
O.D.T.
4
6
8
9
10
H2
FALL
RISE
CO
L1
(HOT)
L2
1
H2
ANTICIPATOR
SUPL. HT.
LED (RED)
O
H.C.R.1
H.C.R.1
H.C.R.2
H.C.R.2
H.C.R.3
C
2
3
5
11
12
C1
CO
SUPL. HT.
RISE