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Honeywell T874G Installation Instructions Manual page 3

Multistage heat pump thermostats and subbases
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THERMOSTAT
FALL
H1 ANTICIPATOR
H1
H2
ANTICIPATOR
H2
FALL
RISE
C1
C1 ANTICIPATOR
RISE
CO
Fig. 3. Internal schematic and typical hookup for T874G/Q674F in heat pump system. Includes AUX. HT. and EM.
T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES
SUBBASE
1
FAN SWITCH
AUTO
2
ON
4
6
SYSTEM
SWITCH
OFF
EM. HT.
HEAT
AUTO
COOL
8
9
10
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
11
OVERLOAD PROTECTION AS REQUIRED.
12
TERMINAL LABELED C/X ON SOME MODELS.
2
W3 TERMINAL ON SOME MODELS ONLY.
3
O
G
B
W3
R
E
L
EM. HT.
LED (RED)
X
AUX. HT.
LED (GREEN)
W2
Y
HT. LEDs.
3
SYSTEM COMPONENTS
COOL CHANGEOVER
VALVE
FAN RELAY
3
B RELAY
AUX HT. RELAY
EM. HT. RELAY
2
AUX. HT. RELAY
COMPRESSOR
CONTACTOR
M5986A
L1
(HOT)
L2
1
69-0268—11

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