THE DIGITAL ROUNDTM NON-PROGRAMMABLE THERMOSTATS OWNER'S GUIDE CT8775A,C 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 ® U.S. Registered Trademark Copyright © 2003 Honeywell International Inc. · · All Rights Reserved 69-1676 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. CO O LE R WAR ME R ROOM SET 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. M19582 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. MERCURY NOTICE MERCURY SWITCH TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT M10614 69-1676 2 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. System Type Gas or Oil Warm Air Electric Warm Air Gas or Oil Hot Water Gas or Oil Steam Gas or Oil Gravity Gas Millivolt Electric Air Conditioning Baseboard Electric (120/240 line volt) Single Stage Heat Pump Multistage Heat Pumps/Multistage Equipment a b Compatibility with CT8775A Yes No Yesa Yes Yes No No No No No Compatibility with CT8775C Yes Yes Yesa Yes Yes No Yes No Yes No Compatible with 2-wire Honeywell zone valves. Not compatible with Taco zone valves and 2- or 3-wire WhiteRodgers zone valves (No. 1311 and 1361). b Not compatible with any 120/240 volt system. Package Contents · · · · Thermostat Wiring labels Screwdriver Needle nose pliers · · · · Decorator cover plate Owner's Guide Drill Drill bits (3/16 in. drywall, 7/32 in. plaster) 3 · Screws and wall anchors Tools for Installation · Hammer 69-1676 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. 69-1676 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 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. WIRES THROUGH WALL OPENING 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. M5136 COVER REMOVED THERMOSTAT WALL PLATE 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. 5 M19492 69-1676 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 DECORATOR COVER PLATE indicator in the middle of the decorator cover plate is pointing up. Position the wallplate: If using the decorator cover plate, pull the wires WALL PLATE through the wiring hole on the wallplate and place the wallplate over the decorator cover plate. Turn 1 INCH SCREW (2) 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 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 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 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. ELECTRICAL BOX DECORATOR COVER PLATE 1/2 INCH SCREW (2) WALL PLATE 3/8 INCH SCREW (2) A 1 1 IF ELECTRICAL BOX IS HORIZONTAL, MOUNT DECORATOR COVER PLATE IN POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A". M19494 WIRING HOLES Fig. 2. Mount decorator cover plate (required) and wallplate onto electrical box (heating-cooling wallplate shown). 7 69-1676 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 connected 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. R G Y W FACTORY INSTALLED JUMPER M19495 FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM). FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM). M19496 69-16 ...