Page 2 - @ RECYCLING THERMOSTAT; Table Of Contents
Welcome to the world of comfort and energy savings with your new Honeywell programmable thermostat. Your new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy when programmed according to the instruc-tions in this manual. Direct any quest...
Page 3 - Prepare For Installation; Gas—Millivolt; Remove Old Thermostat
Prepare For Installation ❑ 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 Compatible With CT2400 Pilot Yes Ignit...
Page 4 - Install The Batteries; indicating the thermostat and heating/cooling; Program The Thermostat
Install The Batteries IMPORTANT: Batteries must be installed for programming and operation of the thermo- stat and heating/cooling system. ❑ Purchase two AA alkaline batteries; alkaline batteries will not last as long, and mayleak, causing damage to thermostat or wall surface. We recommend Energizer...
Page 5 - Personal Programming Chart; cannot; set any higher than 88° F [31° C] or any lower than
sleeping. (Again, lower heat or higher cool. For more comfortable sleeping, some people choose not to raise the cool tem-perature during the night.) You will set one schedule for weekdays andanother for weekends, because your require- ments will probably be different for each.During weekends, only t...
Page 7 - Adjust Fan Operation Switch, As Required
quick guide for operating or making changes follows: NOTE: System switch must be set to Heat or Cool to perform the following: Temp — u Temporarily Change Temperature for Current Period . Temporary indicator will show on display; it will cancel itself at next scheduled change. To cancel sooner, pres...
Page 8 - Mount Thermostat Mounting Plate; Level for appearance only thermostat will
NOTE: This thermostat does not have a setting for steam/gravity air. Cycles would not be long enough for accurate temperature control. IMPORTANT: When using a high efficiency furnace such as a90 percent or greater Average Fuel Utilization Efficiency (AFUE) unit, adjust screw A OUT ONE TURN and screw...
Page 11 - Check Thermostat Operation; After; Temp
Mount The Thermostat A. ENGAGE TABS AT TOP OF SWING COVER OPEN THERMOSTAT AND MOUNTING PLATE. I I i/ B. PRESS LOWER EDGE OF CASE TO LATCH. NOTE: To remove thermostat from wall, first pull out at bottom of thermostat, removing top last. Mount The Thermostat A. ENGAGE TABS AT TOP OF THERMOSTAT AND MOU...
Page 12 - Set The Fan And System Switches
COOLING To avoid possible compressor damage, do not operate the cooling system when outsidetemperature is below 50° F [1 O“ C]. See compressor manu- facturer instructions for further information. NOTE: When cooling setting is changed, thermostat may delayup to five minutes before turning on the air ...
Page 13 - Troubleshooting Guide; C] or higher than 88° F
Troubleshooting Guide IF...Display will not come on. Temperature display will not go lowerthan 45° F C] or higher than 88° F [31 0 C] during programming. Temperature change occurs at the wrong times. Heating will not come on. THEN... Set the system switch to OFF. Remove batteries. Insert batteries b...