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Wiring Diagrams - Honeywell CT3550 Owner's Manual

Weekday, saturday and sunday programmable heat and/or cool low voltage (20 to 30 vac) thermostat and wallplate
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WIRING DIAGRAMS

2-WIRE HEAT-ONLY
(JUMPER INTACT)
THERMOSTAT
B
RC O W Y
R
1 POWER SUPPLY.
PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
3-WIRE HEAT ONLY WITH FAN
(JUMPER INTACT)
THERMOSTAT
B
RC O W Y
R
HEATING
RELAY OR
VALVE COIL
1 POWER SUPPLY. PROVIDE
DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
G
HEATING
RELAY OR
VALVE COIL
1
M10616
G
FAN
1
RELAY
M10618
THERMOSTAT
1 POWER SUPPLY. PROVIDE
DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
4-WIRE SINGLE-STAGE HEAT PUMP
(JUMPER INTACT)
THERMOSTAT
B
R
2
COOL
1
CHANGEOVER
VALVE
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
2
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y.
3
21
4-WIRE HEAT/COOL
(JUMPER INTACT)
B
RC O W Y
R
G
HEATING
COOLING
FAN
RELAY OR
CONTACTOR
RELAY
VALVE COIL
COIL
RC O W Y
G
3
HEAT
COMPRESSOR
CHANGEOVER
CONTACTOR
VALVE
FAN
RELAY
1
M10617
2
M12739
69-1284—2

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