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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8124
Fig. 99. Schematic and hookup of T874C with Q674C. Used in standard applications.
L2
1
ON
H1 ANTICIPATOR
H2 ANTICIPATOR
H1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
MOMENTARY POSITION. SPRING RETURN TO "ON" UPON SWITCH RELEASE.
H1 AND C1 ARE DPST SWITCHES.
M531
Y1
W1
C1 ANTICIPATOR
AUTO
FALL
FALL
HEAT RELAY 1
HEAT RELAY 2
COMPRESSOR RELAY
L1
(HOT)
R
FAN RELAY
O
AUTO
OFF
SERVICE
LED (RED)
A
G
2
2
3
4
5
5
3
3
4
MOMENTARY
CIRCUIT
T
T
EXTERNAL
TEMP.
READOUT
THERMOSTAT SUBBASE SYSTEM COMPONENTS
FAN
SWITCH
SYSTEM
SWITCH
RISE
H2
THERMISTER
W2
W3
Y2
1
2
4
5
6
7
8
9
10
C1
11
12
H3 OFFSET 12°F FROM H2 FOR NIGHT SETBACK.
THERMISTOR INTERNAL TO THERMOSTAT.