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Internal Schematic And Typical Wiring Diagram For Y594R1672 (T874R1889/Q674L1736) And Y594R1698 (T874R1905/Q674L1777); Internal Schematic And Typical Wiring Diagram For Y594R1797 (T874R1988/Q674L1868) - Honeywell Q674L Installation Instructions Manual

Thermostats with subbases
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THERMOSTAT
FALL
H1
C1
FALL
H2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 11. Internal schematic and typical wiring diagram for Y594R1672 (T874R1889/Q674L1736) and Y594R1698
(T874R1905/Q674L1777). Exact replacement for York model nos. 2TH11702324 and 6TH11702224.
THERMOSTAT
H1/C1
ANTICIPATOR
H1
C1
FALL
H2
ANTICIPATOR
H2
FALL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
TERMINAL LABELED C/X ON SOME MODELS.
3
W3 TERMINAL AVAILABLE ON SOME MODELS ONLY.
Fig. 12. Internal schematic and typical wiring diagram for Y594R1797 (T874R1988/Q674L1868).
2
H1/C1
ANTICIPATOR
3
4
5
6
H2
ANTICIPATOR
11
RESET HEATER
12
SUBBASE
2
FAN
3
SWITCH
AUTO
ON
4
6
SYSTEM
SWITCH
EM. HT.
T874R THERMOSTATS AND Q674L SUBBASES
SUBBASE
FAN SWITCH
AUTO
ON
EM. HT.
LED (RED)
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
HEAT
OFF
COOL
7
SYSTEM COMPONENTS
FAN RELAY
G
R
AUX. HT. RELAY
W
H
"H" RELAY
B
X
EM. HT. RELAY
T
O
CHANGEOVER VALVE (COOL)
Y
COMPRESSOR
CONTACTOR
SYSTEM COMPONENTS
R
L
EM. HT.
LED (RED)
AUX. HT.
3
RELAY
W3
2
X
AUX. HT.
AUX. HT.
LED (GRN)
RELAY
W2
FAN RELAY
G
COOL CHANGEOVER
VALVE
O
E
EM. HT. RELAY
Y
COMPRESSOR
CONTACTOR
B
"B" RELAY
L1
L2
(HOT)
1
C815A1039
THERMISTOR
M3173A
L1
(HOT)
L2
1
M3683A
69-0392—9

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