CT2700 An Electronic RoundTM Programmable Thermostat USER'S GUIDE MERCURY SWITCH TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT M10614 RECYCLING THERMOSTAT 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 this control, or of an old control containing mercury in a sealed tube. Programmable Heat and/or Cool Low Voltage (20 to 30 Vac) Thermostat and Wallplate Model CT2700 Congratulations on the purchase of your new thermostat! Over 100 years of Honeywell engineering expertise went into the making of this thermostat in an effort to provide you with a more comfortable and convenient living environment. Your new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy when programmed according to the instructions in this manual. Direct any questions concerning the application of this thermostat to Honeywell Customer Assistance at 1-800-468-1502, Monday - Friday 7:00 a.m. - 5:30 p.m., Central time. If you have questions, call Honeywell, Inc. at 1-800-468-1502. 1 PREPARE FOR INSTALLATION Check Table 1 to make sure this thermostat is compatible with your system. If not, return to the retailer. For more information, call Honeywell, Inc. at 1-800-468-1502. ®U.S. Registered Trademark Copyright © 1997 Honeywell Inc. · · All Rights Reserved X-XX UL 69-1085 CT2700 AN ELECTRONIC ROUND TM PROGRAMMABLE THERMOSTAT Table 1. Compatibility Chart System Type Gas--Standing Pilot Gas--Electronic Ignition Gas-Fired Boilers Gas--Millivolt Oil-Fired Boilers Oil-Fired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric (120/240 Line Volt) Heat Pumps/Multistage Equipment Yes a Yes Yesa,b No Yes b Yes Yes Yes No No Compatible With CT2700 Not compatible with any 120/240 volt circuit. Not compatible with 2-wire White-Rodgers no. 1361 zone valves. aNot compatible with millivolt systems. bCompatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostats zone valves Acquire tools and items as needed. See Fig. 1. Loosen screws holding thermostat to subbase, wallplate, to wall and lift away. Disconnect wires from old thermostat or subbase. As you disconnect each wire, use masking tape to label it with the old terminal designation. If there are only two wires, they do not need labeling. Wrap wires around a pencil to keep them from falling back into the wall as shown in Fig. 2. WIRES THROUGH WALL OPENING CROSS-RECESSED SCREWDRIVER HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL WIRE CUTTER/STRIPPER OR SHARP KNIFE, IF NEEDED TO STRIP WIRES MASKING TAPE, IF NEEDED TO LABEL WIRES AS DISCONNECTED FROM OLD THERMOSTAT M5136 Fig. 2. Wrapping wires around pencil. LEVEL, IF NEEDED TO LEVEL THERMOSTAT FOR APPEARANCE M878B Fig. 1. Required installation tools/supplies. Replacing Clock With C or C1 Clock Terminals If you are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that go to the C or C1 clock terminals on the Chronotherm® Thermostat wiring wallplate. Do not allow them to touch, or you can damage your transformer. Disconnect the wires and wrap them separately using electrical tape; do not wrap them together. Place the wires to avoid interfering with the new thermostat operation. Record the colors and terminal designation labels of the remaining wires. 2 REMOVE OLD THERMOSTAT Test to make certain that your heating and air conditioning systems (where applicable) are working properly. If either 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). CAUTION Six or More Wires If there are six or more wires connected to the thermostat (excluding clock wires attached to terminals), you probably have a variation of a multistage heat pump or other multistage system. The thermostat is not compatible with such systems so return the product to your retailer. If you would like information about which programmable thermostats work with your system, call Honeywell Customer Assistance Center at 1-800-468-1502. Be careful when handling wires during installation. Damage to heating/cooling system possible. Disconnect power at furnace or at main breaker/ fuse box before starting operation. Carefully unpack your new thermostat, wallplate, and decorator cover plate; save package of screws, instructions and receipt. Remove the cover from the old thermostat. If it does not snap off when pulled firmly from the bottom, check for a screw used to lock on the cover. 69-1085 2 CT2700 AN ELECTRONIC ROUND TM PROGRAMMABLE THERMOSTAT Three Thermostat Wires If you have three wires for heating only and can operate the fan using the FAN ON switch, this thermostat works with your system. However, some hot water (zoned) heating systems have three thermostat wires. The thermostat will work only if you install an isolating relay on these systems. For details, call Honeywell Customer Assistance Center at 1-800-468-1502. 4 WIRE WALLPLATE TERMINALS The CT2700 Thermostat is powered through the heating/ cooling system and is adaptable to most 4-wire, 18 to 30 Vac heating-cooling systems. Refer to Figs. 4 through 6 for some typical system wiring diagrams. T8700 R G 3 MOUNT WALLPLATE IMPORTANT Level for appearance only. The thermostat functions normally even when not mounted level. Position the decorator cover plate and wallplate on the wall. Level the wallplate for appearance if desired. Use a pencil to mark the two mounting holes that best fit the application. See Fig. 3. WALL 1 L1 (HOT) L2 1 Y W HEATING PRIMARY CONTROL 24V COOLING CONTACTOR FAN RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M12525 Fig. 4. CT2700 wiring diagram, 4-wire heat/cool system. T8700 R G DECORATOR COVER PLATE PLASTIC SCREW ANCHOR (2) Y W HEATING RELAY AND FAN COIL 24V 1 WALLPLATE OFF HEAT C L OO F A N 1 TO AU POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M12543 Fig. 3. Mounting decorator cover plate and wallplate to wall. Remove the decorator cover plate and wallplate from the wall, and drill two 3/16-inch holes in the wall (if drywall). For firmer wall material such as plaster or wood, drill 7/32-inch holes. Gently tap provided anchors into the drilled holes until flush with the wall. Reposition the decorator cover plate and wallplate, pulling wires through the wiring opening. Loosely insert the mounting screws into the holes. Level for appearance only; the thermostat functions properly even when not level. Tighten the mounting screws. N O Fig. 5. CT2700 wiring diagram, 2-wire, heat-only system. T8700 M12532 R G Y W FAN COIL 1 L1 (HOT) L2 1 24V COOLING CONTACTOR COIL POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M12544 Fig. 6. CT2700 wiring diagram, 3-wire, cool-only system. IMPORTANT Use 18-gauge maximum wire to wire the thermostat. 3 69-1085 CT2700 AN ELECTRONIC ROUND TM PROGRAMMABLE THERMOSTAT All wiring must comply with local electrical codes and ordinances. If unsure about household wiring procedures, call your local heating and air conditioning contractor. Refer to the masking tape labels you placed on wires when you removed your old thermostat. Match the letter of your old thermostat wire with the terminal of the corresponding letter on your new thermostat. Refer to Fig. 7. ROUTE WIRING AS SHOWN THROUGH ENTRANCE HOLE ALTERNATE MOUNTING SCREW HOLE 5 ADJUST FAN OPERATION SWITCH The thermostat fan operation switch, labeled fuel switch in Fig. 9, is set at the factory in the F (gas/oil fuel) position. This is the correct setting for most systems. If this system is an electric heat system, set the switch to the E (electric) position. The E setting allows the fan to turn on immediately with the heating or cooling equipment in a system where the G terminal is connected. FUEL SWITCH AT HE FA N FF O ON MOUNTING SCREW HOLE F E CO OL TO AU R G Y W ALTERNATE MOUNTING SCREW HOLE MOUNTING SCREW HOLE WIRING ENTRANCE HOLE M12529 M12531 Fig. 9. Fuel switch, rear view of thermostat. Fig. 7. CT2700 wallplate wiring connections. NOTE: To ensure proper mounting of the thermostat, restrict all wiring to the left side of the terminals. Loosen the terminal screws and slip each wire beneath its matching terminal. The shape of the terminals permit insertion of straight or wraparound connections. See Fig. 8. Tighten the terminals. 6 MOUNT THERMOSTAT TO WALLPLATE Align the tab and connector pins at the top of the thermostat with the wallplate. See Fig. 10. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT HE AT FA N O CO OL FF ON TO AU Set CO OL HE AT FA N FOR WRAPAROUND, STRIP 7/16 INCHES (11 mm) O FF ON TO AU A ALIGN TABS/PINS AT TOP FOR STRAIGHT INSERTION, STRIP 5/16 INCHES (8 mm) OF THERMOSTAT WITH WALLPLATE CONNECTOR. Set M12537 Fig. 8. CT2700 methods for wiring connection. Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation. B M12530 PRESS THERMOSTAT CASE STRAIGHT ON TO LATCH. Fig. 10. Mounting thermostat to wallplate. 69-1085 4 CT2700 AN ELECTRONIC ROUND TM PROGRAMMABLE THERMOSTAT Press the thermostat straight on to the wallplate to latch. NOTE: To remove the thermostat from the wallplate, grasp the thermostat on both sides and pull the thermostat straight out. Restore power to the heating/cooling system. 3. Set WAKE SET Temperature a. Press . b. Press or to set desired WAKE temperature. 4. Set SLEEP Time a. Press . b. Press or to set desired SLEEP time. 5. Set SLEEP SET Temperature a. Press . b. Press or to set desired SLEEP temperature. 6. Run Program Press . End is displayed for five seconds indicating the end of programming. The thermostat then displays the current time and room temperature. AM PM 7 PROGRAM YOUR THERMOSTAT The thermostat is preprogrammed for your convenience with the following time and temperature settings, see Table 2. Table 2. Preprogrammed Time/Temperature Settings. PM Period WAKE SLEEP Start Time 6:00 AM Heating Setpoint 70°F (21°C) Cooling Setpoint 78°F (25.5°C) 82°F (28°C) 10:00 PM 62°F (16.5°C) WAKE is the time period you want the house at a comfortable temperature during the day. SLEEP is the time period you can set for an energysavings temperature while you are sleeping. NOTE: The heating and cooling program times are the same. Changing your cooling WAKE time also changes your heating WAKE time. The following sequence uses the heating program as an example; the System switch is in the HEAT position. To change to the cooling program, move the System switch to the COOL position and enter the cooling temperature settings. NOTE: To exit the sequence at any time, press until End is displayed. 1. Set Current Time a. Press . b. Press or to set current time. PM 8 OPERATE YOUR THERMOSTAT Display Temperature Setting a. Press or once SET to display present AM temperature setting. After approximately five seconds, the thermostat displays the current time and room temperature. PM Temporary Change a. Press or until the desired temperature is displayed. b. TEMPORARY is displayed. The TEMPORARY change is in effect until the next program period. SET AM If you wish to change the preprogrammed time/ temperature settings, follow steps 2 through 6. If not, press the key until End is displayed or the thermostat will automatically return to normal operational mode within five minutes. 2. Set WAKE Time a. Press . b. Press or to set desired WAKE time. TEMPORARY AM AM NOTE: To cancel your TEMPORARY change, press until End is displayed. 5 69-1085 CT2700 AN ELECTRONIC ROUND TM PROGRAMMABLE THERMOSTAT Hold Function To hold the thermostat at one temperature indefinitely, program both WAKE and SLEEP to the same temperature. 10 CHECK OPERATION AFTER Heating System INSTALLATION/PROGRAMMING 9 SET FAN AND SYSTEM SWITCHES Manually control fan and system settings using the switches located at the top of the thermostat case. See Fig. 11 for switch locations. SYSTEM SWITCH TEMPERATURE DISPLAY FAN SWITCH Slide the System switch to HEAT and the Fan switch to AUTO. Press and hold the key to raise the temperature several degrees above the room temperature to start the heating equipment. When using the thermostat with the fuel switch set to the E position for electric heat, the fan starts immediately. Press the key to lower the temperature setting below the room temperature. The heating equipment should stop. AT HE FF O CO OL FA N ON TO AU Cooling System CAUTION PM Set Operating at too low of an outdoor temperature may cause compressor damage Damage to compressor possible. Do not operate cooling system if outdoor temperature is be ...