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Honeywell Q674L Installation Instructions Manual Page 6

Honeywell thermostats and subbases installation instructions.
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T874R THERMOSTATS AND Q674L SUBBASES
SYSTEM COMPONENTS
SUBBASE
THERMOSTAT
L1
L2
(HOT)
2
FAN SWITCH
1
FALL
H1/C1
FAN RELAY
H1
ANTICIPATOR
AUTO
C1
G
3
ON
R
4
AUX. HT. RELAY
W
5
FALL
H
H2
"H" RELAY
6
B
H2
EM. HT.
ANTICIPATOR
LED (RED)
SYSTEM
X
SWITCH
EM. HT. RELAY
EM. HT.
T
HEAT
C815A1039
OFF
THERMISTOR
O
COOL
CHANGEOVER VALVE (COOL)
11
Y
RESET HEATER
COMPRESSOR
12
CONTACTOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M3173A
Fig. 9. Internal schematic and typical wiring diagram for Y594R1664 (T874R1871/Q674L1736) and Y594R1706
(T874R1913/Q674L1777). Exact replacement for York model no. 2TH11702224.
SUBBASE
THERMOSTAT
SYSTEM COMPONENTS
W3 RELAY
W3
O
COOL
H1
CHANGEOVER VALVE
ANTICIPATOR
L
CHECK
1
LED (RED)
COMPRESSOR
FAN
MONITOR
C ANTICIPATOR
SWITCH
FAN RELAY
2
G
AUTO
1
L1
ON
(HOT)
R
L2
H1
C
W2
FALL
3
AUX. HT. RELAY
SYSTEM
EM. HT.
SWITCH
LED
4
(RED)
E
AUX. HT.
EM .HT.
EM. HT. RELAY
LED
(GREEN)
HEAT
5
X
H2
OFF
ANTICIPATOR
B
6
H2
COOL
HEAT
CHANGEOVER VALVE
FALL
Y
11
COMPRESSOR
RELAY
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
M5068
OVERLOAD PROTECTION AS REQUIRED.
Fig. 10. Internal schematic and typical wiring diagram for Y594R1615 (T874R1822/Q674L1710). TRADELINE;
intended for use in applications where W2 and E terminals are not jumpered.
69-0392—9
6

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