Honeywell CT3451 Owner's Manual page 4

CT3451 PROGRAMMABLE THERMOSTAT
HEAT
RELAY
1
FAN
L1
RELAY
(HOT)
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
JUMPER R TO Rc.
Fig. 6. Typical heat-cool system hookup with single
transformer.
THERMOSTAT
G
Rc
R
W
Y
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. Typical heat system hookup with 2-wire, heat-
only system.
69-1620—1
THERMOSTAT
G
Rc
3
R
W
B
Y
O
COOL
DAMPER
COMPRESSOR
CONTACTOR
B
O
HEATING
RELAY AND
FAN COIL
24V
M20536
G
Rc
R
W
Y
2
2
HEAT
DAMPER
1
Fig. 8. Typical cool system hookup with 3-wire,
M20510
1
L1
(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.
Fig. 9. Typical heat-cool system hookup with two
4
THERMOSTAT
B
O
COOLIING
CONTRACTOR
1
COIL
L1
(HOT)
24V
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
cool-only system.
THERMOSTAT
G
Rc
R
2
W
Y
3
FAN
COOL
RELAY
DAMPER
COMPRESSOR HEAT
CONTACTOR RELAY
transformers.
FAN
COIL
M20537
B
O
3
HEAT
DAMPER
1
L1
(HOT)
L2
HEATING
TRANSFORMER
M20511