Honeywell Ct8775c44471 Manual
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OWNER’S GUIDE ® U.S. Registered Trademark • Patents Pending Copyright © 2004 Honeywell International Inc. All Rights Reserved 69-1676—1 CT8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS CT8775A Heat Only Thermostat (20 to 30 Vac) and CT8775C Heating-Cooling Thermostat (20 to 30 Vac) Para obtener un documento con las instrucciones en español, por favor visite nuestro sitio de web a: www.honeywell.com/yourhome. Pour obtenir des 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 Thermostat ............................................................................................................................. 10 Step 9. Mount the Thermostat .................................................................................................................................... 11 Step 10. Set the System and Fan Switches ............................................................................................................... 12 Step 11. Operating the Thermostat............................................................................................................................. 13 Step 12. Check Operation of Heating and/or Cooling System ................................................................................... 13 If You Have A Problem ............................................................................................................................................... 15 Wiring Diagrams ......................................................................................................................................................... 16
69-1676—1 2 Enjoy the benefits of The Digital RoundTM 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. MERCURY NOTICEIf 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. COOLERWARMER ROOMSET M19582 M10614 MERCURY SWITCH TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT
3 69-1676—1 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. aCompatible with 2-wire Honeywell zone valves. Not compatible with Taco zone valves and 2- or 3-wire White- Rodgers zone valves (No. 1311 and 1361). bNot compatible with 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 TypeCompatibility with CT8775ACompatibility with CT8775C Gas or Oil Warm Air Yes Yes Electric Warm Air No Yes Gas or Oil Hot Water Ye s aYe sa 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) bNo No Single Stage Heat Pump No Yes Multistage Heat Pumps/Multistage Equipment No No
69-1676—1 4 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 operate 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: • A thermostat that has wires connected to C or C1 terminals. • A thermostat that is connected to six or 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 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. Replacing 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.
5 69-1676—1 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 ❑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 cover from thermostat. Separate the wallplate from the 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. STEP 6. MOUNT DECORATOR COVER PLATE AND THERMOSTAT WALLPLATE ❑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. WIRES THROUGH WALL OPENING M5136 WALL PLATE THERMOSTAT COVER REMOVED M19492
69-1676—1 6 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 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 up with the screw holes on the decorator cover plate. You will be inserting the screws through these holes into the wall. ❑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 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 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.Fig. 1. Mount decorator cover plate (optional) and wallplate directly to wall (heating-cooling wallplate shown). M19493 WALL ANCHORS (2) WIRING HOLESDECORATOR COVER PLATE WALL PLATE 1 INCH SCREW (2)
7 69-1676—1 . 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 decorator 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. Fig. 2. Mount decorator cover plate (required) and wallplate onto electrical box (heating-cooling wallplate shown). 1 TROUS DE CÂBLAGE PLAQUE DADAPTATION DÉCORATIVE PLAQUE DE COMMUTATIONVIS 1/2 PO (2) VIS 3/8 PO (2) BOÎTE ÉLECTRIQUE MF19494 1 SI LA BOÎTE ÉLECTRIQUE EST HORIZONTALE, MONTER LA PLAQUE DADAPTATION DÉCORATIVE DANS LA POSITION ILLUSTRÉE, MAIS INSÉRER LES VIS DANS LE TROU DE MONTAGE «A».A
69-1676—1 8 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 on 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 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 insulation to help prevent drafts from adversely affecting thermostat operation. M19495FACTORY INSTALLED JUMPER Y G R W M19496 FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM). FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM).
9 69-1676—1 Table 2. Terminal Designations on Old and New Thermostats. NOTES: 1.If wires were connected to both Rh and R terminals on the old thermostat, 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. Terminal on Old ThermostatConnect to Terminals on CT8775AConnect To Terminals on CT8775C Description R Rh (see Note 1) 4 VRR (see Note 2) Power Rc R (see Note 1) —Rc (see Note 2) Power for cooling W, W 1, H W W Heat Y, Y 1, M — Y Cooling G, F — G F a n O — O 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) X (see Note 4) B (see Note 3) Do not connect. Do not connect. Transformer common W 2, H2Do not continue installation. Call 1-800- 468-1502.Do not continue installation. Call 1-800- 468-1502.Second stage heat. Y 2Second stage cool.
69-1676—1 10 STEP 8. CUSTOMIZE THE THERMOSTAT Set Fuel Switch (CT8775C Only) ❑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. 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 and 2 are set according to your partic- ular heating system.Fig. 3. Fuel switch. Fig. 4. DIP switch. M19497FUEL SWITCH ON123 M19567 BACK OF THERMOSTAT DIP SWITCH