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7 69-0435—10
Fig. 10—Internal schematic and typical wiring diagram for Y594G1567 (T874G1865/Q674J1209) and
Y594G1575 (T874G1873/Q674J1225); auto changeover in cooling. Exact replacement for York model
nos. 2TH11702424 and 6TH11702424.
EM. HT.
AUX. HEAT RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
RISE
CO
RISE
C1
6
8
9
10
X
B
Y
COMPRESSOR
CONTACTOR
FALL
H2
5
W
4
SYSTEM COMPONENTSSUBBASETHERMOSTAT
H1 ANTICIPATOR
2
L1
(HOT)
L2
1
FALL
H1
3
O
G
R
FAN RELAY
COOL CHANGEOVER VALVE
H2 ANTICIPATOR
C1 ANTICIPATOR
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
AUTO
OFF
EM. HEAT
LED (RED)
M5723
EM. HEAT RELAY
Fig. 11—Internal schematic and typical wiring diagram for Y594G1633 (T874G1972/Q674F1584); auto
changeover in heating and cooling.
H1
FALL
RISE
CO
L1
(HOT)
L2
1
C1
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
C1 ANTICIPATOR
H1 ANTICIPATOR
FAN SWITCH
AUTO
ON
SYSTEM
SWITCH
AUTO
HEAT
OFF
COOL
1
2
4
6
8
9
10
O
W2
X
E
L
B
R
G
Y
AUX. HEAT RELAY
FAN RELAY
EM. HT. RELAY
B RELAY
M5986
THERMOSTAT SUBBASE SYSTEM COMPONENTS
11
12
COMPRESSOR
CONTACTOR
EM. HT.
EM. HT.
LED (RED)
AUX. HEAT
LED (GREEN)
COOL CHANGEOVER
VALVE
H2
FALL
H2
ANTICIPATOR