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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8168
Fig. 159. Schematic and hookup of T874G with Q674J. Used in heat pump applications.
Fig. 160. Schematic and hookup of T874G with Q674J. Used in heat pump applications.
L1
(HOT)
L2
1
H1
FALL
H1 ANTICIPATOR
H2
FALL
CO
RISE
C1
RISE
1
2
4
6
8
9
10
O
G
R
X
Y
W
C1 ANTICIPATOR
E
OFF
AUTO
SYSTEM
SWITCH
FAN SWITCH
OUTDOOR
THERMOSTAT
OFF
AUTO
EM.HT.
EM. HT. LED
(RED)
LIMIT
COMPRESSOR
CONTACTOR
HEAT RELAY
CONTACT
EM. HT.
RELAY
AUX. HT. RELAY
COOL CHANGEOVER VALVE
FAN RELAY
M5722
HEAT RELAY
CONTACT
SYSTEM COMPONENTS
SUBBASETHERMOSTAT
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
H2 ANTICIPATOR
EM. HT.
AUX. HT. RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
RISE
CO
RISE
C1
6
8
9
10
X
B
Y
COMPRESSOR
CONTACTOR
FALL
H2
5
W
4
SYSTEM COMPONENTSSUBBASETHERMOSTAT
H1 ANTICIPATOR
2
L1
(HOT)
L2
1
FALL
H1
3
O
G
R
FAN RELAY
COOL CHANGEOVER VALVE
H2 ANTICIPATOR
C1 ANTICIPATOR
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
AUTO
OFF
EM. HT.
LED (RED)
M5723
EM. HT. RELAY