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CT3451 PROGRAMMABLE THERMOSTAT
69-1620—1 4
Fig. 6. Typical heat-cool system hookup with single
transformer.
Fig. 7. Typical heat system hookup with 2-wire, heat-
only system.
Fig. 8. Typical cool system hookup with 3-wire,
cool-only system.
Fig. 9. Typical heat-cool system hookup with two
transformers.
L1
(HOT)
L2
M20510
FAN
RELAY
THERMOSTAT
COMPRESSOR
CONTACTOR
TRANSFORMER
COOL
DAMPER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
JUMPER R TO Rc.
2
2
2
1
Y
G
Rc
W
3
R
B
O
HEAT
RELAY
HEAT
DAMPER
3
1
1
HEATING
RELAY AND
FAN COIL
24V
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M20536
THERMOSTAT
Y
G
Rc
W
R
B
O
L1
(HOT)
L2
1
FAN
COIL
COOLIING
CONTRACTOR
COIL
24V
POWER SUPPLY. PROVIDE DISCONNECT MEAN
S
AND OVERLOAD PROTECTION AS REQUIRED.
M2053
7
THERMOSTAT
Y
G
Rc
W
R
B
O
1
Y
G
Rc
W
2
R
B
O
M20511
L1
(HOT
L2
FAN
RELAY
HEAT
RELAY
L1
(HOT)
L2
COMPRESSOR
CONTACTOR
HEATING
TRANSFORMER
COOLING
TRANSFORMER
HEAT
DAMPER
COOL
DAMPER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER
SYSTEM.
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.
2
3
3
1
1
3
4


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