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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
101 60-2485—8
Fig. 53. Schematic and hookup of T874D with Q674B. Used in standard applications.
Fig. 54. Schematic and hookup of T874W with Q674B. Used in standard applications.
H1
FALL
W1
W2
G
Y2
Y1
HEAT RELAY 2
HEAT RELAY 1
H1
ANTICIPATOR
C1 ANTICIPATOR
AUTO
ON
FAN SWITCH
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
M3202A
L1
(HOT
)
L2
1
FAN RELAY
COMPRESSOR
CONTACTOR 2
COMPRESSOR
CONTACTOR 1
1
4
6
8
9
10
11
H2
FALL
C2 ANTICIPATOR
RISE
RISE
C1
C2
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
H2 ANTICIPATOR
R
SYSTEM
SWITCH
HEAT
OFF
COOL
L1 (HOT
)
L2
1
W1
T
W2
HEAT RELAY 3
FAN RELAY
W3
HEAT CHANGEOVER VALVE
COMPRESSOR CONTACTOR 2
B
Y2
Y1
SYSTEM
SWITCH
HEAT
OFF
COOL
H1 ANTICIPATOR
C1
H1
FALL
H3
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
M3674
AUTO
ON
FAN SWITCH
FALL
R
COMPRESSOR CONTACTOR 1
HEAT RELAY 2
HEAT RELAY 1
G
C815A THERMISTOR
H2 ANTICIPATOR
FALL
H3 ANTICIPATOR
H2
C2 ANTICIPATOR
C2
RISE
RISE
COOL CHANGEOVER VALVE
O
C1 ANTICIPATOR
RESET HEATER
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
1
2
3
4
5
6
8
10
11