Honeywell CT3550 WIRING DIAGRAMS

21 69-1284—2

WIRING DIAGRAMS

THERMOSTAT

1 POWER SUPPLY.

PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

HEATING

RELAY OR

VALVE COIL

OWY

2-WIRE HEAT-ONLY

(JUMPER INTACT)

M10616

M10617

THERMOSTAT

1 POWER SUPPLY. PROVIDE

DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

4-WIRE HEAT/COOL

(JUMPER INTACT)

HEATING

RELAY OR

VALVE COIL

COOLING

CONTACTOR

COIL

FAN

RELAY

OWY

M10618

THERMOSTAT

1 POWER SUPPLY. PROVIDE

DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

3-WIRE HEAT ONLY WITH FAN

(JUMPER INTACT)

HEATING

RELAY OR

VALVE COIL

FAN

RELAY

OWY

M12739

THERMOSTAT

4-WIRE SINGLE-STAGE HEAT PUMP

(JUMPER INTACT)

OWY

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.

USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y.

COMPRESSOR

CONTACTOR

COOL

CHANGEOVER

VALVE

HEAT

CHANGEOVER

VALVE

FAN

RELAY

Contents

Main OWNERS GUIDE Honeywell CT3550 PROGRAMMABLE THERMOSTAT Table of Contents Total comfort temperature management with Smart Response Technology. MERCURY NOTICE TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT Page AM STEP 1. PREPARE FOR INSTALLATION Package Contents. Tools Required STEP 2. REMOVE OLD THERMOSTAT Special Installations Replacing a Clock Thermostat that has C or C1 Clock Terminals Replacing a Thermostat that has Six or More Wires Replacing a Thermostat that has Three Wires STEP 3. MOUNT THERMOSTAT WALLPLATE STEP 4. WIRE WALLPLATE TERMINALS R W Y G STEP 5. INSTALL THE BATTERIES STEP 6. MOUNT THE THERMOSTAT STEP 7. CUSTOMIZE YOUR THERMOSTAT Fan Operation (Feature Number 2) System Type (Feature Number 4) Smart Response Technology (Feature Number 13) Temperature Format (Feature Number 14) Time Format (Feature Number 16) Factory Set Function (Feature Number 37) STEP 8. SET THE CLOCK Set Current Day and Time STEP 9. PROGRAMMING Program Weekdays Program Saturday and Sunday Clear a Program Period STEP 10. OPERATING YOUR THERMOSTAT Change Temperature Setting Until the Next Program Period (Temporary Change) Change Temperature Setting Indefinitely (Hold) Change the Temperature Setting Until a Designated Day and Period (Vacation Hold) STEP 11. SET THE FAN AND SYSTEM KEY Set the Fan Key Set the System Key If You Have a Problem Toll-Free Customer Assistance SMART RESPONSE TECHNOLOGY WIRING DIAGRAMS 2-WIRE HEAT-ONLY (JUMPER INTACT) 4-WIRE HEAT/COOL (JUMPER INTACT) 3-WIRE HEAT ONLY WITH FAN (JUMPER INTACT) 4-WIRE SINGLE-STAGE HEAT PUMP (JUMPER INTACT) Notice: This thermostat is a Class B di g ital apparatus that complies with Canadian Radio Interference Re g Limited One-Year Warranty