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
1POWER 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
1POWER 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
THERMOSTAT