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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
137 60-2485—8
Fig. 116. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
H2
FALL
H1
FALL
C1
YR
COM
G
W
O
EH
O
G
Y
A
H
W2
R
B
X
E
L1
(HOT)
L2
1
COMPRESSOR
CONTACTOR
AUX. HT. RELAY
EM. HT. RELAY
EM. HT.
LED (RED)
EM. HT.
HEAT
OFF
COOL
COMP. FAULT
LED (YELLOW)
SYSTEM
SWITCH
FAN
SWITCH
AUTO
ON
1 POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
OPTIONAL FIELD WIRE JUMPER TO CYCLE
AUXILIARY HEAT RELAY WITH H1 INSTEAD
OF H2 (FASTER RESPONSE).
2
ELEC.
HT. RELAY
M2857
H1/C1
ANTICIPATOR
H2 ANTICIPATOR
2
R8233B
THERMOSTAT
SYSTEM COMPONENTS
SUBBASE
2
5
6
4
3