Honeywell CT2400 Owner's Manual - Page 3
Prepare For Installation, Remove Old Thermostat - instructions
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~ Prepare For Installation u Check Table 1 to make sure this thermostat is compatible with your system. If it is not, return to retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502. TABLE 1 -COMPATIBILITY CHART. System Type Gas-Standin~ Pilot Compatible With CT2400 Yes Gas-Electro~c Ignition Gas-Fired Boilers EA A Gas-Millivolt Oil-Fired Boilers OWired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric (120/240 Line Volt) Y:AA Yes Yes Yes No Heat PumpdMultistage Equipment No .lN,-o.I -c-o-m-pa-.u, Ir-m,- .W.I.Ir.I.Lar-l-y--I.fainl~/n+"un V..U_IiL. -c:x.-r.u.m:. . ~Compatible with 2-wire Honeywell zone valves. Isolating relay requiredfor3-wire thermo- stats for zone valves. Not compatible with 2-wire White-Rodgers no. 1361 valves. ~Compatible with hot water baseboard systems. Will not work efficiently on steam or gravity systems. 7 _ Remove Old Thermostat [1 Test to make certain that your heating and cooling systems 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]. u TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel. U Carefully unpack your new thermostat and mounting plate; save the package of screws, instructions and receipt. U Remove cover from old thermostat. If it does not snap off when pulled firmly from the bottom, check for a screw used to lock on the cover. u Loosen screws holding thermostat to subbase, wallplate or wall, and lift away. U 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 to be labeled. If there is an extra wire that is not connected to your old thermostat, you will ako not be connecting it to your new thermostat. Keep the wires from falling back into the wall by wrapping them around a pencil as shown. 4 --. . - Replacing a Clock Thermostat that has C or Cl Clock Terminals? If you are replacing a Honeywell Chronotherm@ Thermostat, you may find one or two wires that go to the C or Cl clock terminals on the Chronotherm Thermostat wiring wallplate. Do not allow them to touch, or you may damage your transformer. Disconnect the wires and wrap them separately, using electrical tape. Do not wrap them together. Place the wires where they will not interfere with the operation of the new thermostat. Record the colors and terminal designation labels of the remaining wires. Six or more wires? If there are six or more wires (excluding clock wires attached to terminals), you most likely have a variation of a heat pump or multistage system. The thermostat is not compatible with such systems so return the product to the place of purchase. If you would like information about which programmable thermostats will work with your system, call Honeywell Customer Assistance at 1-800-468-1502. Three thermostat wires? If you have three wires for heating only and can operate the fan using the fan ON switch, this thermostat will work with your system. However, some hot water (zoned) heating systems have three thermostat wires. The thermostat will not work without installing an isolating relay on these systems. For details, call Honeywell Customer Assistance at 1-800468-1502. 5