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Honeywell T8112C Owner's Manual

Electronic programmable thermostat
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Electronic Programmable
Owner's Manual
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved


Table of Contents

Summary of Contents for Honeywell T8112C

  • Page 1 Electronic Programmable Thermostat Owner’s Manual ® U.S. Registered Trademark © 2004 Honeywell International Inc. All Rights Reserved 69-0862—4...
  • Page 2: Table Of Contents

    Table of Contents Programming Your Thermostat ................ 3 Program Schedule................... 5 Set Current Time/Day..................6 Heating Program ..................... 6 Cooling Program....................7 Operating Your Thermostat ................7 Using Programming Features................7 Setting Fan Switch................... 8 Setting System Switch..................9 Maintaining Your Thermostat ................9 Installing Batteries ...................
  • Page 3: Programming Your Thermostat

    Programming Your Thermostat WAKE is the time the thermostat turns on the heating/cooling equipment after an energy When batteries are installed, your thermostat saving period. When deciding what time to can be programmed in your hand before it is set for your WAKE period, include extra lead installed or after it is mounted on the wall.
  • Page 4 ature and your furnace response time, to it. For example, a house that is occupied during give the furnace a head start to heat the weekdays would only require programs for house before you arrive home. WAKE and SLEEP. SLEEP is the time period you can set for an energy-saving temperature while you are When pressing the keys, use the ball of your sleeping.
  • Page 5: Program Schedule

    Program Schedule Heating Program Schedule Weekdays Start Time Heating Temperature Cooling Temperature WAKE LEAVE RETURN SLEEP Weekends WAKE SLEEP WAKE and RETURN start times should include extra lead time, based on outside temperature and furnace response time, to give your furnace a head start to heat the house. The temperatures cannot be set higher than 88°F (26°C) or lower than 45°F (7°C).
  • Page 6: Set Current Time/Day

    NOTE: If you decide not to program the thermostat, it will automatically control heating at 68°F (20°C), and cooling at 78°F (26°C), 24 hours a day. This guide can be used for program- ming your new thermostat. IMPORTANT Batteries are required for operation To set the day, press and release the Set and programming.
  • Page 7: Cooling Program

    Cooling Program Press Set Schedule key until WAKE, SA SU and SET appear on the display. Use Time keys WIth System switch at Cool, follow the same to program WAKE time and Temp keys to instructions as for the Heating Program. program WAKE temperature for Sat-Sun.
  • Page 8: Setting Fan Switch

    Hold a temperature indefinitely—Press Permanently Change a program—Repeat the Hold Temp key once. Press Temp keys steps in the Heating Program or Cooling until display shows desired temperature. Program sections, as applicable. Press Run Program key once to return to the program.
  • Page 9: Setting System Switch

    Maintaining Your Thermostat Setting System Switch System switching positions control thermostat operation: Installing Batteries Cool: Thermostat controls air conditioning system. IMPORTANT Off: Both heating and air conditioning systems Batteries must be installed for pro- are off. gramming and operation of the ther- Heat: Thermostat controls heating system.
  • Page 10 INSTALL TWO AA ALKALINE BATTERIES AS SHOWN LEAVE Auto On System Cool Off Heat FAN SWITCH SYSTEM SWITCH M5781 M5782 5. Replace the battery door. After batteries are completely dead, bAtLo As batteries are running low, bATLo indicator indicator disappears, leaving the display flashes for one to two months before batteries completely blank and the heating and/or cooling run out completely.
  • Page 11 To remove batteries, press down on the left If the display is blank, the batteries are dead or ends. If the new batteries are installed within 20 incorrectly installed and the thermostat has to to 30 seconds of removing the old ones, the be reprogrammed.
  • Page 12: Troubleshooting Guide

    Troubleshooting Guide If... Then... Display does not come on. • Set the System switch to Off. Remove batteries. Insert backward for at least five seconds to reset thermostat. Correctly replace batteries. Display should come on. • Make sure batteries are fresh and installed correctly. •...
  • Page 13 If... Then... Heating does not come on. • Check that System switch on thermostat is set to Heat. Allow a minimum of five minutes for time-guard protection to expire. • Check the system fuse or circuit breaker and replace or reset, if necessary. •...
  • Page 14 If... Then... Cooling does not come on (Cont) • The thermostat has a built-in time delay on cooling. Allow at least five minutes after changing the setting before the air conditioner starts. • Make sure outdoor disconnect is engaged (on). •...
  • Page 15 If... Then... Too warm or too cool. • Press Run Program key to check the current temperature setting. • If desired, change the temperature setting. See Programming Your Thermostat section. System On indicator is lit, but no • Allow time for the furnace to heat up and the fan to heat is coming from the registers.
  • Page 16 If... Then... bAtLo remains on display after fresh • Remove the batteries. Wait one hour. Install fresh batteries are installed. alkaline batteries. NOTICE This equipment is a Class B digital apparatus, which complies with Canadian Radio Interference Regulations, CRC c.1374. 69-0862—4...
  • Page 17: Limited One-Year Warranty

    Limited One-Year Warranty Honeywell warrants this product to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.
  • Page 18 This warranty does not cover removal or reinstallation costs.This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.
  • Page 19 69-0862—4...
  • Page 20 Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-0862—4 J.S. Rev. 10-04

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