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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8122
Fig. 95. Schematic and hookup of T874F with Q674K. Used in wood/oil applications.
Fig. 96. Schematic and hookup of T874C with Q674C. Used in standard applications.
H1
FALL
1
OFF
WOOD
SYSTEM
SWITCH
H1 ANTICIPATOR
WOOD/OIL
OIL
OIL LED
(RED)
W2
M5984
POWER SUPPLY. PROVIDE DISCONECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
SYSTEM COMPONENTSSUBBASETHERMOSTATS
2
3
4
5
6
H2
FALL
NO FAN
SWITCH
OIL RELAY
WOOD RELAY
L1
(HOT)
L2
1
X
W1
R
WOOD LED
(GREEN)
H2 ANTICIPATOR
H2
FALL
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION AS REQUIRED.
THERMOSTAT SUBBASE
SYSTEM COMPONENTS
L1
(HOT)
L2
1
C1
RISE
H1
FALL
FAN SWITCH
AUTO
ON
SYSTEM
SWITCH
OFF
AUTO
C1 ANTICIPATOR
H2 ANTICIPATOR
NO. 1 HEAT RELAY
NO. 2
HEAT RELAY
HEAT
DAMPER
COOL DAMPER
FAN RELAY
NO. 1 COMPRESSOR
CONTACTOR
ON LED
(YELLOW)
SERVICE
LED (RED)
C
A
X
Y1
Y2
G
O
RC
RH
B
W2
W1
1
4
6
8
9
10
11
M104A