Honeywell CT8775A User's Manual
Contents
1. i49 Step 12 Check Operation of Heating and or Cooling System ae LEVIS e Wining Diagrams RN ER usum etos TIT NN Copyright 2004 Honeywell International Inc All Rights Reserved 9 1676 1 Enjoy the benefits of The Digital Round Thermostat by Honeywell Simple to use Turn the dial to adjust the temperature setting Large easy to read display The temperature reading is easily seen from a distance Backlit display On demand backlighting makes it easy to read the display in a dark room or hallway No batteries required The temperature setting is held permanently in memory in the event of a power failure This manual answers many of the questions 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 t 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 Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control containing mercury in a sealed tube 69 1676 1 2 M19582 La MERCURY SWITCH TYPICA2. 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 NOTE The cooling cycle rate does not require adjustment and therefore cannot be changed Fahrenheit Celsius Indication Use DIP switch to set the desired temperature indication See Table 4 Table 4 Temperature Indication Fahrenheit Celsius Display DIP Switch 3 Fahrenheit factory setting Off Celsius On STEP 9 MOUNT THE THERMOSTAT ENGAGE TABS AT BOTTOM OF THERMOSTAT AND WALL PLATE PRESS UPPER EDGE OF CASE TO LATCH M19498 11 69 1676 1 STEP 10 SET THE SYSTEM AND FAN SWITCHES CT8775C ONLY System Switch see Fig 5 Heat The thermostat controls your heating system Off Both the heating and cooling systems are off Cool The thermostat controls your cooling system Fan Switch see Fig 5 Fan Auto Normal 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 a WALL PLATE SYSTEM FAN SWITCH SWITCH CT8775C ONLY CT8775C ONLY SELECTS SELECTS ON AUTO COOL OFF HEAT ROOM TEMPERATURE fe INDICATOR INDICATORS SHOWS THAT THE T
3. called for cooling The cooling system should turn on Turn the dial clockwise to raise the temperature setting above the room temperature The snowflake zh will disappear from the display to indicate the thermostat has ended the call for cooling The cooling system should turn off Fan CT8775C Only Slide the system switch to Off and the fan switch to On The fan should run continuously Slide the Fan switch to Auto The fan should turn off 69 1676 1 14 IF YOU HAVE A PROBLEM Table 5 Solution Guide If Then Display does not appear Make sure the thermostat is wired correctly Refer to Table 2 or the wiring diagrams Make sure the thermostat is mounted and latched on the wallplate 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 position and set it to On if it is in the Off position Temperature settings will not change example cannot set the heating 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 position and set it to On if it is
4. in the Off position Wait five minutes for the system to respond Cooling does not come on Set the system switch to Cool CT8775C only Make sure the temperature setting is below 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 position and set it to On if it is in the Off position Wait five minutes for the system to respond System on indicator A heat k cool is lit but no warm or cool air is coming from the registers Wait five minutes after seeing the flame or snowflake and check the registers again If there is no warm or cool air coming from the registers refer to Heating does not come on or Cooling does not come on If all of this has been checked contact your local heating and cooling contractor Customer Assistance Please read and follow the provided instructions for this thermostat For additional information go to www honeywell com yourhome or call Honeywell Customer Care toll free at 1 800 468 1502 Before calling please have the following information available Thermostat model number Located on back of thermostat Thermostat date code Located below model number Type of heating cooling system example Gas oil or electric warm air hot water heat pump steam or gravity Location and number of wires connected to the thermostat 15 69 1676 1 Wiring Diagrams
5. 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 WIRES THROUGH WALL OPENING M5136 STEP 5 SEPARATE WALLPLATE FROM COVER REMOVED THERMOSTAT THERMOSTAT WALL PLATE Remove cover from thermostat Separate the wallplate from the ERR thermostat by placing your thumb on the top between the wallplate and the thermostat and pulling the thermostat away from the wallplate See the illustration at the right s STEP 6 MOUNT DECORATOR COVER PLATE E AND THERMOSTAT WALLPLATE AS je 7 M19492 The decorator cover plate and wallplate can be mounted directly on the wall or onto an electrical box To mount directly to the wall see Fig 1 To mount onto an electrical box see Fig 2 5 69 1676 1 Mount Decorator Cover Plate Optional and Wallplate Directly to Wall If using the decorator cover plate pull the wires through the wiring hole on the decorator cover plate Position the WALL ANCHORS 2 decorator cover plate against the wall so that the UP indicator in the middle of the decorator cover plate is pointing up Position the wallplate If using the decorator cover plate pull the wires through the wiring hole on the wallplate and 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
6. up with the screw holes on the decorator cover plate You will be inserting the screws through these holes into the wall P If attaching 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 DECORATOR COVER PLATE M19493 pointing up WIRING HOLES Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate Fig 1 Mount decorator cover plate optional and Remove the wallplate and decorator cover plate if used wallplate directly to wall heating cooling wallplate and drill two 3 16 in holes in the wall if drywall at the shown locations you marked For materials such as plaster drill 7 32 in holes where marked Gently tap the provided anchors into the drilled holes until they are flush with the wall Pull the wires through the wiring holes and reposition the decorator cover plate if used and wallplate over the screw holes Attach the decorator cover plate if used and wallplate to the wall with two 1 in screws 69 1676 1 6 Mount Decorator Cover Plate Required and Wallplate onto Electrical Box Pull the wires through the wiring hole on the decorator cover plate Place the decorator cover plate against the electrical box so that the UP indicator in the middle of the decorator cover plate is pointing up Line up the screw slots on the decorato
7. 2 WIRE HEAT ONLY CT8775A 3 WIRE HEAT ONLY WITH FAN CT8775C JUMPER INTACT Gc Y w HEATING HEATING FAN RELAY OR LN RELAY OR RELAY VALVE COIL VALVE COIL POWER SUPPLY PROVIDE DISCONNECT MEANS ZN Power SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED AND OVERLOAD PROTECTION AS REQUIRED M19450 ANrAcTORY INSTALLED JUMPER M19451 4 WIRE HEAT COOL CT8775C JUMPER INTACT HEATING RELAY OR VALVE COIL COMPRESSOR CONTACTOR N Power SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED J Factory INSTALLED JUMPER M19452 69 1676 1 16 4 WIRE SINGLE STAGE HEAT PUMP CT8775C JUMPER INTACT HEAT COMPRESSOR CHANGEOVER CONTACTOR VALVE COOL CHANGEOVER VALVE POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED FACTORY INSTALLED JUMPER 18453 A JUMPER WIRE NOT SUPPLIED TO CONNECT W TO Y A USE EITHER O OR B FOR HEAT PUMP CHANGEOVER Notice 5 WIRE HEAT COOL CT8775C JUMPER REMOVED COMPRESSOR CONTACTOR POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND Rc M19454 This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations CRC c 1374 17 69 1676 1 Limited One Year Warranty Honeywell warrants this product to be free from defects in the workmanship or m
8. COOLING SYSTEM Heating System Slide the system switch to Heat and the Fan switch to Auto CT8775C only Turn the dial clockwise to raise the temperature setting several degrees above the 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 13 69 1676 1 Cooling System CT8775C Only N CAUTION Equipment Damage Hazard Can cause permanent damage to compressor or other equipment Do not operate cooling when outside temperature is below 50 F 10 C Allow compressor to remain off for five minutes before restarting See equipment manufacturer instructions Slide the system switch to Cool and the Fan switch to Auto Turn the dial counterclockwise to lower the temperature setting several degrees below the room temperature NOTE Ifa call for cooling is made before the compressor has been 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 E will flash during this delay After five minutes the thermostat will display a solid snowflake to indicate the thermostat has
9. HAT SHOW 2 CURRENT ROOM THERMOSTAT HAS TEMPERATURE IS CALLED FOR DISPLAYED HEATING TEMPERATURE OR COOLING amp SETTING INDICATOR SHOWS THAT THE CURRENT TEMPERATURE SETTING IS DISPLAYED DIAL DISPLAYS AND ADJUSTS TEMPERATURE SETTING TURNS BACKLIGHT ON M19512 DIGITAL DISPLAY DISPLAYS ROOM OR SET TEMPERATURE BACKLIGHT BUTTON Fig 5 CT8775 Thermostat features and operation 69 1676 1 12 STEP 11 OPERATING THE THERMOSTAT NOTE Batteries are not required because the temperature setting is held permanently in memory Backlit Display Q The backlight can be turned on by turning the dial or pushing the backlight button see Fig 5 Display Temperature Setting Q Turn the dial one click to display the temperature setting see Fig 6 A P gt indicator points to Set when the temperature setting is displayed o ROOM SET M19489 Fig 6 Temperature Setting Display Ifa change to the temperature setting is not made within five seconds the mode will switch to the room temperature display see Fig 7 A gt indicator points to Room when the room temperature is displayed I 0 ROOM Lic SET M19490 Fig 7 Room Temperature Display Adjust Temperature Setting Turn the dial clockwise to raise the temperature setting Turn the dial counterclockwise to lower the temperature setting STEP 12 CHECK OPERATION OF HEATING AND OR
10. Honeywell CT8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS OWNER S GUIDE CT8775A Heat Only Thermostat 20 to 30 Vac and 7 CT8775C Heating Cooling Thermostat 20 to 30 Vac a Mo Para obtener un documento con las instrucciones en espa ol por favor visite a nuestro sitio de web a www honeywell com yourhome l 58 be Pour obtenir des notices techniques en fran ais veuillez consulter notre site web www honeywell com yourhome S P Contents Step 1 Prepare for Installation 3 Step 2 Remove Old Thermostat 2 x icti seize smt sae ER nud Re br 4 Step Special Installations aw 4 Step 4 Label Thermostat Wires an 5 Step 5 Separate Wallplate from 5 Step 6 Mount Decorator Cover Plate and Thermostat 1 5 Step 7 Wire Wallplate Step 8 Customize the Thermostat a Step 9 Mount the Thermostat cccccccececeeeceneeeeeeaeeeeceaeeeeeaeeeeeaeeeseeaeeeseeaeeesceaeeeseaaeeeseeeesseaeeceaeeesseeeeeseaeeeeseeeeeeeea Step 10 Set the System and Fan Switches 12 Step 11 Operating the
11. L LOCATION OF A MERCURY SWITCH IN A THERMOSTAT M10614 STEP 1 PREPARE FOR INSTALLATION Check Table 1 the compatibility chart to make sure the thermostat is compatible with your system If your system is not compatible call Honeywell Customer Care toll free 1 800 468 1502 Table 1 Compatibility Chart Compatibility with Compatibility with System Type CT8775A CT8775C Gas or Oil Warm Air Yes Yes Electric Warm Air No Yes Gas or Oil Hot Water Yes Yes Gas or Oil Steam Yes Yes Gas or Oil Gravity Yes Yes Gas Millivolt No No Electric Air Conditioning No Yes Baseboard Electric 120 240 line volt No No Single Stage Heat Pump No Yes Multistage Heat Pumps Multistage Equipment No No Rodgers zone valves No 1311 and 1361 Not compatible with any 120 240 volt system Package Contents Thermostat Wiring labels Tools for Installation Screwdriver Needle nose pliers aCompatible with 2 wire Honeywell zone valves Not compatible with Taco zone valves and 2 or 3 wire White Decorator cover plate Owner s Guide Drill Drill bits 3 16 in drywall 7 32 in plaster 3 Screws and wall anchors Hammer 69 1676 1 STEP 2 REMOVE OLD THERMOSTAT Test your heating and cooling systems to make sure they work properly If either system does not work contact your local heating air conditioning dealer To avoid compressor damage do not ope
12. aterials under normal use and service for a period of one 1 year from the date of purchase by the consumer If at any time during the warranty period the product is defective or malfunctions Honeywell shall repair or replace it at Honeywells option within a reasonable period of time If the product is defective i return it with a bill of sale or other dated proof of purchase to the retailer from which you purchased it or ii package it carefully along with proof of purchase including date of purchase and a short description of the malfunction and mail it postage prepaid to the following address Honeywell USA Honeywell Canada Dock 4 MN10 3860 Honeywell Limited Honeywell Limit e 1885 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 3992 Scarborough Ontario M1V 4Z9 This warranty does not cover removal or reinstallation costs This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which 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 PRODUCT Some states do not allow the exclusion or limitation of incidental o
13. ermostat remove jumper between R and Rc on the new thermostat and connect Rh to R and R to Rc 2 If wires will be connected to both R and Rc on the new thermostat remove jumper between R and Rc 3 Do not connect both O and B when wiring to a single stage heat pump Connect O to O Tape off B with electri cal tape and do not use 4 Tape off wire with electrical tape and do not use 9 69 1676 1 STEP 8 CUSTOMIZE THE THERMOSTAT Set Fuel Switch CT8775C Only Q To adjust the fuel switch locate the switch labeled E F on the wallplate see Fig 3 The fuel switch is factory set in the F position This is the correct setting for gas or oil systems If you have an electric heat System or a heat pump set the switch to E The E setting allows the fan 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 FUEL SWITCH M19497 Set Heat Cycle Rate Use DIP switches 1 and 2 to set the heat cycle rate See Table 3 Fig 3 Fuel switch BACK OF THERMOSTAT NOTE The CT8775A C Thermostats will provide optimal temperature control if DIP switches 1 and 2 are set according to your partic ular heating system M19567 DIP SWITCH Fig 4 DIP switch 69 1676 1 10 Table 3 Heat Cycle Rate
14. lacing a thermostat that is connected to six or more wires If you are replacing a thermostat that is connected to six or more wires excluding wires connected to C or C1 terminals you may have a multistage heat pump or other multistage system If you have either one of these systems return the product to the place of purchase This thermostat is not compatible with these systems For information about which thermostats will work with your system call Honeywell Customer Care at 1 800 468 1502 69 1676 1 4 Replacing a thermostat that is connected to three wires on a warm air heating only system If you are replacing a thermostat that is connected to three wires on a warm air heating only system and could turn the fan on by setting the thermostat fan switch to ON the CT8775C Thermostat will work with your system Continue with the installation at Step 4 If you purchased a CT8775A thermostat return the product to the place of purchase The CT8775A thermostat is not compatible with this application Replacing a thermostat that is connected to three wires on a zoned hot water heating system If you are replacing a thermostat that is connected to three wires on a zoned hot water heating system the CT8775A C thermostats will only work if an isolation relay is installed For details call your local heating and or cooling contractor STEP 4 LABEL THERMOSTAT WIRES Q Disconnect the wires from the old thermostat As you disconnect each wire attach
15. ng terminals R and Rc on the CT8775C Thermostat if wires will be con nected to both of these terminals INSTALLED JUMPER M19495 For wiring diagrams see 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 FOR STRAIGHT INSERTION Q Plug the hole in the wall with insulation to help prevent drafts from STRIP 5 16 IN 8 MM adversely affecting thermostat operation FOR WRAPAROUND INSERTION STRIP 7 16 IN 11 MM M19496 69 1676 1 8 Table 2 Terminal Designations on Old and New Thermostats Terminal on Old Connect to Terminals Connect To Terminals Thermostat on CT8775A on CT8775C Description R R R see Note 2 Power Rh see Note 1 4 V Rc RC see Note 2 Power for cooling R see Note 1 W W4 Y Y4 M Y Cooling GF G Fan Changeover in cool Single stage heat pump only B see Note 3 B see Note 3 Changeover in heat Single stage heat pump only C see Note 4 Do not connect Do not connect Transformer common X see Note 4 B see Note 3 Wo Ho Do not continue Do not continue Second stage heat installation Call 1 800 installation Call 1 800 Yo 468 1502 468 1502 Second stage cool NOTES 1 If wires were connected to both Rh and R terminals on the old th
16. r consequential damages so this limitation may not apply to you THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT THE DURATION OF ANY IMPLIED WARRANTIES INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you This warranty gives you specific legal rights and you may have other rights which vary from state to state If you have any questions concerning this warranty please write Honeywell Customer Care 1885 Douglas Dr N Golden Valley MN 55422 3992 In Canada write Retail Products ON30 Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 429 69 1676 1 18 69 1676 1 Honeywell Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 Printed in U S A on recycled 69 1676 1 J S Rev 6 04 paper containing at least 10 post consumer paper fibers www honeywell com yourhome
17. r cover plate with the electrical box screw holes and attach the decorator cover plate to the electrical box with two 1 2 in screws Pull the wires through the wiring hole on the 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 BOITE LECTRIQUE PLAQUE D ADAPTATION D CORATIVE PLAQUE DE COMMUTATION VIS 3 8 PO 2 A SI LA BOITE LECTRIQUE EST HORIZONTALE MONTER LA PLAQUE D ADAPTATION D CORATIVE DANS LA POSITION ILLUSTR E MAIS INS RER LES VIS DANS LE TROU DE TROUS DE CABLAGE MONTAGE A MF19494 Fig 2 Mount decorator cover plate required and wallplate onto electrical box heating cooling wallplate shown 69 1676 1 STEP 7 WIRE WALLPLATE TERMINALS IMPORTANT All wiring must comply with local codes and ordinances If unsure about household wiring procedures call your local heating air conditioning contractor Refer to the labels you placed the wires when you removed the old thermostat see illustration Match the letter of your old thermostat wire with the corresponding terminal letter on your new thermostat Refer to Table 2 IMPORTANT Remove the factory installed jumper connecti
18. rate the cooling system when outdoor temperature is below 50 F 10 C Turn off power to the system at the furnace or the fuse circuit breaker panel Carefully unpack your new thermostat and decorator cover plate Save package of screws instructions and receipt Remove the cover from the old thermostat If the cover does not snap off when pulled firmly from the top or bottom check for a screw or screws that may be used to lock on the cover Loosen the screw or screws if present holding the thermostat to the wallplate and lift the thermostat away Do not disconnect wires STEP 3 SPECIAL INSTALLATIONS Read this section if you are replacing Athermostat that has wires connected to C or C1 terminals A thermostat that is connected to six or more wires Athermostat that is connected to three wires on a warm air heating only system Athermostat that is connected to three wires on a zoned hot water heating system D D DOO 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 wires connected to C or C1 terminals do not allow them to touch or you can damage the transformer Wrap the wires separately using electrical tape Place the wires where they will not interfere with the operation of the new thermostat Continue with the installation at Step 4 Rep
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