Honeywell CT2700 Owner's Manual - Page 2

CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT Table 1. Compatibility Chart System Type Compatible With CT2700 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 Yesa Yes Yesa,b No Yesb Yes Yes Yes No No 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. CROSS-RECESSED SCREWDRIVER HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL 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 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. 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 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. 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. 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. 69-1085 2