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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
211 60-2485—8
Fig. 227. Schematic and hookup of T874G with Q674F. Used in heat pump applications.
CO
(HEAT)
FALL
H2
FALL
RISE
H1
FALL
L1
(HOT)
L2
1
2
1
2
RISE
C1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
W1 - Y1 JUMPER IS Y TERMINAL; REMOVE JUMPER WHEN W1 RELAY IS USED.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
M1230B
1
2
3
4
5
6
8
9
10
11
Y1
W1
B
O
X
X1
E
W2
R
G
W3
X2
W3 RELAY
FAN RELAY
AUX. HT.
RELAY
EM. HT.
RELAY
COMPRESSOR
FAULT
CHECK
LED (RED)
AUX.
HT. LED
(GREEN)
EM. HT.
LED (RED)
SYSTEM
SWITCH
OFF
EM. HT.
HEAT
AUTO
COOL
COOL CHANGEOVER
RELAY
HEAT CHANGEOVER
RELAY
W1 RELAY
COMPRESSOR
CONTACTOR
C1
ANTICIPATOR
CO
(COOL)
H2 ANTICIPATOR
H1
ANTICIPATOR
FAN
SWITCH
AUTO
ON