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69-0392—9
6
T874R THERMOSTATS AND Q674L SUBBASES
Fig. 9. Internal schematic and typical wiring diagram for Y594R1664 (T874R1871/Q674L1736) and Y594R1706
(T874R1913/Q674L1777). Exact replacement for York model no. 2TH11702224.
H2
FALL
H1
FALL
C1
L1
(HOT)
L2
1
FAN SWITCH
AUTO
ON
FAN RELAY
AUX. HT. RELAY
"H" RELAY
EM. HT. RELAY
CHANGEOVER VALVE (COOL)
COMPRESSOR
CONTACTOR
C815A1039
THERMISTOR
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
EM. HT.
LED (RED)
G
R
W
H
B
X
T
O
Y
12
11
6
5
4
3
2
H1/C1
ANTICIPATOR
H2
ANTICIPATOR
RESET HEATER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M3173A
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
1
H2
FALL
H1
FALL
C
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
M5068
H1
ANTICIPATOR
C ANTICIPATOR
H2
ANTICIPATOR
11
6
5
4
3
2
1
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
EM .HT.
HEAT
OFF
COOL
AUX. HT.
LED
(GREEN)
EM. HT.
LED
(RED)
Y
B
X
E
W2
R
G
L
O
W3
W3 RELAY
COOL
CHANGEOVER VALVE
COMPRESSOR
MONITOR
FAN RELAY
AUX. HT. RELAY
EM. HT. RELAY
HEAT
CHANGEOVER VALVE
COMPRESSOR
RELAY
CHECK
LED (RED)
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.