b. Using the labels on the wires, match le tter of your old thermostat wire with the corresponding terminal on the back of your new thermostat. NOTE: If letters on old thermostat terminals do not match letters on new thermostat terminals, all old wires may not need connect-ing to new thermostat. See Special Wiring Instructions section. Fig. 10. c.. Honeywell MS3000 MAINTAINING YOUR THERMOSTAT REPLACING THE BATTERY. Your thermostat uses a 9 V alkaline battery as backup to hold the program in case of a power outage. For best results, replace battery every 5 years. To replace: Open right-hand thermostat door. Remove battery from battery holder and battery connector.
View and Download Honeywell MAGICSTAT CT2400 programming and installation instructions online. Weekday/Weekend (5-day/2-day) Programmable Heat and/or Cool Low Voltage (20 to 30 Vat) Thermostat and Mounting Plate. MAGICSTAT CT2400 thermostat pdf manual download.. 69-0654-5 INSTALLATION 7 Heating system table Note: Setting the screw "out one turn" means turning the screw 360° counter-clockwise, or one complete turn. Step 5. Wire the thermostat terminals Type of system Screws A and B Fuel switch Warm air, gas, or oil heating system with an efficiency rating under 90%.