Internal Schematic And Typical Wiring Diagram For Y594R1763 (T874R1954/Q674L1827); Internal Schematic And Typical Wiring Diagram For Y594R1243 (T874R1152/Q674L1207) - Honeywell Q674L Installation Instructions Manual

T874R THERMOSTATS AND Q674L SUBBASES
THERMOSTAT
H1
C1
FALL
H2
FALL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
2 FIELD REMOVABLE JUMPER.
Fig. 5. Internal schematic and typical wiring diagram for Y594R1763 (T874R1954/Q674L1827). Replaces
GE AY28X078, AY28X139; Trane Baystat 139, Baystat 239 and Baystat 240;
THERMOSTAT
H1/C1
ANTICIPATOR
FALL
H1
C1
H2
ANTICIPATOR
H2
FALL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 AUXILIARY HEAT LED AVAILABLE ON SOME MODELS.
Fig. 6. Internal schematic and typical wiring diagram for Y594R1243 (T874R1152/Q674L1207).
69-0392—9
1
2
3
4
5
SYSTEM
SWITCH
EM. HT.
6
HEAT
11
and Honeywell Y594R1136 Thermostats.
SUBBASE
2
3
FAN SWITCH
AUTO
4
ON
5
6
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
SUBBASE
AUX. HT.
AUTO
LED (GREEN)
ON
EM. HT.
FAN
LED (RED)
SWITCH
OFF
COOL
R
W3
W2
AUX. HT.
LED
(GREEN)
2
X
EM. HT.
LED (RED)
L
G
O
E
Y
B
4
SYSTEM COMPONENTS
G
FAN RELAY
W
AUX. HEATER
2
RELAY
U
B
COMPRESSOR
MONITOR
F
R
T
X2
OUTDOOR
THERMOSTAT
O
COMPRESSOR
RELAY
Y
SYSTEM COMPONENTS
L2
(HOT) L1
ODT 1
RTD 1 EHR 1
ODT 2
EHR 2
SYSTEM
MONITOR
RD
COOL CHANGEOVER
VALVE
LACO
COMPRESSOR
CONTACTOR
1
L1
(HOT)
L2
OUTDOOR
THERMISTOR
COOL
CHANGEOVER
VALVE
M2970
1
RTD 2
RTD 3
RTD 1
FAN RELAY
EM. HT.
RELAY
CHP
M5072A