Honeywell THE DIGITAL ROUND CT8775A Owner'S Manual Download Page 16 | Manualshive

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16

Wiring Diagrams

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

W

R

HEATING

RELAY OR

VALVE COIL

M19450

1

1

M19451

HEATING

RELAY OR

VALVE COIL

FAN

RELAY

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

2 FACTORY INSTALLED JUMPER.

1

2

W

R

Rc

B

O

Y

G

1

HEATING

RELAY OR

VALVE COIL

COMPRESSOR

CONTACTOR

FAN

RELAY

M19452

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

2 FACTORY INSTALLED JUMPER.

2

W

R

Rc

B

O

Y

G

«
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Summary of Contents for THE DIGITAL ROUND CT8775A

Page 1: ...es notices techniques en français veuillez consulter notre site web www honeywell com yourhome Contents Step 1 Prepare for Installation 3 Step 2 Remove Old Thermostat 4 Step 3 Special Installations 4 Step 4 Label Thermostat Wires 5 Step 5 Separate Wallplate from Thermostat 5 Step 6 Mount Decorator Cover Plate and Thermostat Wallplate 5 Step 7 Wire Wallplate Terminals 8 Step 8 Customize the Thermos...

Page 2: ...tions that can arise as you become familiar and comfortable with your Honeywell thermostat the state of the art in home comfort controls Read these instructions carefully Failure to follow these instructions can damage the product or cause a hazardous condition MERCURY NOTICE If this thermostat is replacing a control that contains mercury in a sealed tube do not place your old control in the trash...

Page 3: ...ith any 120 240 volt system Package Contents Thermostat Decorator cover plate Screws and wall anchors Wiring labels Owner s Guide Tools for Installation Screwdriver Drill Hammer Needle nose pliers Drill bits 3 16 in drywall 7 32 in plaster System Type Compatibility with CT8775A Compatibility with CT8775C Gas or Oil Warm Air Yes Yes Electric Warm Air No Yes Gas or Oil Hot Water Yesa Yesa Gas or Oil...

Page 4: ... more wires A thermostat that is connected to three wires on a warm air heating only system A thermostat that is connected to three wires on a zoned hot water heating system NOTE If none of the special installations apply to your particular application please skip to Step 4 Replacing a thermostat that has wires connected to C or C1 terminals If you are replacing a thermostat that has one or two wi...

Page 5: ...ork if an isolation relay is installed For details call your local heating and or cooling contractor STEP 4 LABEL THERMOSTAT WIRES Disconnect the wires from the old thermostat As you disconnect each wire attach the enclosed labels with the old terminal designation Wrap the wires around a pencil as shown to keep them from falling back into the wall STEP 5 SEPARATE WALLPLATE FROM THERMOSTAT Remove c...

Page 6: ... the wallplate directly to the wall pull the wires through the wiring hole on the wallplate and position it so that the UP indicator on the wallplate is pointing up Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate Remove the wallplate and decorator cover plate if used and drill two 3 16 in holes in the wall if drywall at the locations you marked For m...

Page 7: ...e wallplate Place the wallplate over the decorator cover plate Turn the wallplate until the wiring holes are aligned and the two screw holes on the left and right side of the wallplate line up with the screw holes on the decorator cover plate Attach the wallplate to the decorator cover plate with the two 3 8 in screws Fig 2 Mount decorator cover plate required and wallplate onto electrical box hea...

Page 8: ...r to Table 2 IMPORTANT Remove the factory installed jumper connecting terminals R and Rc on the CT8775C Thermostat if wires will be con nected to both of these terminals For wiring diagrams see pp 16 17 Loosen the terminal screws Slip each wire beneath its matching terminal Wraparound and straight connections are both acceptable see illustration Tighten the terminals Plug the hole in the wall with...

Page 9: ...nd do not use 4 Tape off wire with electrical tape and do not use Terminal on Old Thermostat Connect to Terminals on CT8775A Connect To Terminals on CT8775C Description R Rh see Note 1 4 V R R see Note 2 Power Rc R see Note 1 Rc see Note 2 Power for cooling W W1 H W W Heat Y Y1 M Y Cooling G F G Fan O O Changeover in cool Single stage heat pump only B see Note 3 B see Note 3 Changeover in heat Sin...

Page 10: ...to turn on immediately with the heating system where the G terminal is connected DIP Switch To adjust the heat cycle rate or the Fahrenheit Celsius indication locate DIP switch 1 2 and 3 on the back of the thermostat See Fig 4 Set Heat Cycle Rate Use DIP switches 1 and 2 to set the heat cycle rate See Table 3 NOTE The CT8775A C Thermostats will provide optimal temperature control if DIP switches 1...

Page 11: ...HERMOSTAT Heating System Cycles Per Hour DIP Switch 1 DIP Switch 2 Steam Gravity 1 On On High Efficiency Warm Air 90 efficiency Hot Water Heat Pump 3 Off On Gas or Oil Warm Air factory setting 6 Off Off Electric Warm Air 9 On Off In Floor Radiant Heat Check with manufacturer for recommended cycle rate Fahrenheit Celsius Display DIP Switch 3 Fahrenheit factory setting Off Celsius On M19498 ENGAGE T...

Page 12: ...l setting for most homes The fan only runs with the heating and cooling system Fan On The fan runs continuously Use for improved air circulation Fig 5 CT8775 Thermostat features and operation ROOM SET DISPLAYS ROOM OR SET TEMPERATURE M19512 CT8775C ONLY SELECTS ON AUTO CT8775C ONLY SELECTS COOL OFF HEAT DISPLAYS AND ADJUSTS TEMPERATURE SETTING TURNS BACKLIGHT ON SHOWS THAT THE CURRENT ROOM TEMPERA...

Page 13: ... room temperature A flame will appear in the display to indicate the thermostat has called for heating The heating system should turn on Turn the dial counterclockwise to lower the temperature setting below the room temperature The flame will disappear from the display to indicate the thermostat has ended the call for heating The heating system should turn off Display Temperature Setting Turn the ...

Page 14: ...en off for five minutes or if a power interruption occurs while the compressor is running the thermostat will go into a five minute delay to protect the com pressor The snowflake will flash during this delay After five minutes the thermostat will display a solid snowflake to indicate the thermostat has called for cooling The cooling system should turn on Turn the dial clockwise to raise the temper...

Page 15: ... higher or the cooling lower Make sure the temperature settings are 40 to 90 F 4 to 32 C for heating 45 to 99 F 7 to 37 C for cooling Heating does not come on Set the system switch to Heat CT8775C only Make sure the temperature setting is above the room temperature Make sure the circuit breaker is not tripped and reset it if necessary Make sure the power switch at the equipment is in the On positi...

Page 16: ...451 HEATING RELAY OR VALVE COIL FAN RELAY 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 2 FACTORY INSTALLED JUMPER 1 2 W R Rc B O Y G 1 HEATING RELAY OR VALVE COIL COMPRESSOR CONTACTOR FAN RELAY M19452 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 2 FACTORY INSTALLED JUMPER 2 W R Rc B O Y G ...

Page 17: ...OWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 2 FACTORY INSTALLED JUMPER 3 USE A JUMPER WIRE NOT SUPPLIED TO CONNECT W TO Y 4 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER 3 2 W R Rc B O Y G 1 2 1 HEATING RELAY OR VALVE COIL COMPRESSOR CONTACTOR FAN RELAY M19454 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED REMOVE FACTORY INSTALLED JUMPER BETWE...

Page 18: ...hich occurred while the product was in the possession of a consumer Honeywells sole responsibility shall be to repair or replace the product within the terms stated above HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY WARRANTY EXPRESS OR IMPLIED OR ANY OTHER FAILURE OF THIS P...

Page 19: ...19 69 1676 1 ...

Page 20: ... 04 www honeywell com yourhome Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 ...

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