Restrict Wiring To Shaded Area; Wiring Connections; Typical Hookup Of T8400C In Heat-Cool System With Single Transformer; Typical Hookup Of T8400C In Heat-Cool System With Two Transformers - Honeywell T8401C1015 - Electronic Thermostat - 1 Heat/1Cool Installation Instructions Manual

KEEP WIRING IN
SHADED AREA
G
Rc
R
W
Y
WIRING ENTRANCE
MOUNTING
HOLE
SCREW HOLE
Fig. 4. Restrict wiring to shaded area
(T8400C shown).
TERMINAL
SCREW
G
Rc
R
W
Y
Fig. 5. Wiring connections
(T8400C shown).
B
O
MOUNTING
SCREW HOLE
M16432
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
B
O
M13274
T8400C, T8401C ELECTRONIC THERMOSTATS
G
Rc
2
R
W B
Y O
1
L1
(HOT)
24V
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
2
Fig. 6. Typical hookup of T8400C in heat-cool system
with single transformer.
FAN
RELAY
1
COMPRESSOR
L1
CONTACTOR
(HOT)
L2
COOLING
TRANSFORMER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO
TRANSFORMER SYSTEM.
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
4
POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH
IS IN THE OFF POSITION.
Fig. 7. Typical hookup of T8400C in heat-cool system
with two transformers.
G
Rc
3
R
W
4
Y
1
L1
(HOT)
24V
L2
TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 CAN BE USED FOR CHANGEOVER VALVE ON
SINGLE-STAGE HEAT PUMP SYSTEMS.
3
FACTORY INSTALLED JUMPER.
4 FIELD INSTALLED JUMPER.
Fig. 8. Typical hookup of T8400C in single-stage heat
pump systems.
3
COOLING
CONTACTOR
FAN
HEATING
RELAY
PRIMARY
CONTROL
G
Rc
R
2
4
W
B
Y
O
3
3
COOL
HEAT
DAMPER
DAMPER
HEAT
RELAY
HEATING
TRANSFORMER
2
HEAT
CHANGEOVER
B
2
COOL
CHANGEOVER
O
FAN
COMPRESSOR
RELAY
M20880
M13275
1
L1
(HOT)
L2
M12562A
69-1740