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Honeywell T8090A/191108A Owner's Manual

Heating or cooling thermostat and wallplate or heating/cooling thermostat and subbase
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Heating or Cooling Thermostat
and Wallplate or
Heating/Cooling Thermostat and
T8090A/191108A, Q682B



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  Summary of Contents for Honeywell T8090A/191108A

  • Page 1 Heating or Cooling Thermostat and Wallplate or Heating/Cooling Thermostat and Subbase T8090A/191108A, Q682B OWNER’S MANUAL 69-0574—2 69-0574-2...
  • Page 2 Welcome to the world of energy savings with your new Honeywell fuel saver thermostat. The Honeywell name is your assurance of accurate control and reliable operation for years to come. Your new thermostat will automatically lower and raise the temperature in your home one or more times every 24 hours.
  • Page 3: Table Of Contents

    TABLE OF CONTENTS Features Of Your Thermostat ... 4 Setting The Temperature ... 7 Inserting Clock Batteries ... 8 Setting The Clock ... 9 Programming ... 10 Troubleshooting ... 14 Servicing The Thermostat ... 23 Cycle Rate Adjustment ... 23 Thermometer Adjustment ...
  • Page 4: Features Of Your Thermostat

    Features Of Your Thermostat 1 FLIP-UP COVER. Lift it up to set clock for energy savings and normal temperature periods. 2 THERMOSTAT COVER. Lift up and remove to adjust heat anticipator. 3 THERMOMETER. Provides accurate room temperature reading. 4 CLOCK. This clock provides a 24-hour slotted dial to hold the programming pins.
  • Page 5 9 PROGRAM PINS. Must be inserted into 24-hour clock dial slots to control program index wheel. 10 PIN SLOTS. Located on 24-hour dial at 10-minute intervals for program pin insertion. 11 MANUAL PROGRAM ADVANCE BUTTON. Allows change from comfort to energy savings setting and vice versa without changing the program.
  • Page 6 15 191108AJ WALLPLATE. Provides mount- ing base and wiring connections for heating-only or cooling-only thermostat. 16 Q682B SUBBASE. Provides mounting base, wiring connections and manual switching control for heating/cooling thermostat. 69-0574—2 M2421 COOL AUTO HEAT M719...
  • Page 7: Setting The Temperature

    Setting The Temperature For Heating: Set the left lever (blue mark) to the energy savings temperature you want when you are sleeping or your home is unoccupied. Set the right lever (red mark) to the tem- perature you want for normal comfort periods. NOTE: You may override the time program by setting both the red and blue levers to the same temperature set point.
  • Page 8: Inserting Clock Batteries

    24 Vac powering method. Install batteries in thermostat as shown in Fig. 2. Once a year or when batteries are dead, replace with two new AAA alkaline batteries.
  • Page 9: Setting The Clock

    Setting The Clock Lift thermostat flip-up cover and you’ll find the 24-hour program dial, slotted in 10-minute increments. Adjust the clock to the current time by moving the minute hand carefully in clock- wise direction. DO NOT reverse the minute hand.
  • Page 10: Programming

    24 hours. Before setting your program: Lift thermostat flip-up cover and you'll find the 24-hour program dial. The slots on the program dial (Fig. 4) are for the program pins that can be inserted at ten-minute intervals.
  • Page 11 To change the pins or add a new energy savings period: • To insert a pin, push it straight into the selected notch on the program dial until it’s completely seated. • To remove a pin, press against program dial and pull the pin straight out.
  • Page 12 Setting the Cooling Program: Decide when you want the temperature to reach the comfort level. Find the notch on the dial that’s one-half hour before this time and blue insert a pin. The half-hour head start gives the air conditioner time to cool the house before you wake up or arrive home.
  • Page 13 Start Or End Programs With Manual Program Advance Button To prevent damage to the program IMPORTANT: advance mechanism, DO NOT use the program advance button within a 30-minute period before or after a program change. The manual program advance button enables immediate, one-time-only program changes to accommodate temporary schedule changes.
  • Page 14: Troubleshooting

    Troubleshooting Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following: Problem No heat. — system switch. May be in OFF or COOL position. — fuse or circuit breaker. — furnace power switch. May be Off.
  • Page 15 Temperature change — programs pins for correct time occurs at the wrong locations. time. Room temperatures — positions of thermostat setpoint are not correct. levers. — position of subbase system switch. Check Turn timer ahead 12 hours. Move setting...
  • Page 16 (continued) Troubleshooting Problem Room temperatures — thermostat circuits. are not correct (continued). 69-0574—2 Check HEATING-ONLY SYSTEM—Move temperature setting levers 5°F (3°C) above room temperature. Heating system should start. If the system does not operate, call a qualified technician. COOLING ONLY SYSTEM–Move temperature setting levers 5°F (3°C)
  • Page 17 (continued) Troubleshooting Problem Room Temperatures are not correct (continued). Burner-on time too — anticipator setting. (See figure on short. page 23 for anticipator location.) Burner-on time too — anticipator setting. (See figure on long. page 23 for anticipator location.) No cooling. —...
  • Page 18 Turn OFF power to cooling system. Contact a qualified service technician for assistance. Reinstall thermostat wallplate or subbase. Use a spirit level. Thermostat should be about 5 ft (1.5m) above floor on an inside wall. Contact qualified service technician for change of location. Action...
  • Page 19 Install as shown on page 8. Replace with two new AAA alkaline batteries as shown on page 8. Replace thermostat. Remove thermostat from the wallplate or subbase and measure the voltage. Refer to the table on page 22 for cause and reaction. Action (continued) 69-0574—2...
  • Page 20 (continued) Troubleshooting Problem Clock does not run — pins in program dial. If pins are (continued). not completely seated in program dial, jamming with index wheel may occur. Clock loses time. — power. May be interrupted. — high limit control. If clock powered through system transformer, power to clock and equipment may be off on safety.
  • Page 21 If clock is not battery powered, clock may still use batteries for backup. If this Troubleshooting section has not solved the problem, call your qualified heating service technician or Honeywell Customer Assistance Center, 1-800-468-1502, Monday-Friday, 7:00 AM to 5:30 PM, Central time, for additional assistance.
  • Page 22 1. System transformer used to power the clock is inadequate. 2. Additional (separate) transformer used to power the clock has inadequate voltage. 15 to 30 Vac. 1. Spring fingers o thermostat not making proper contact with subbase terminals. 2. Clock has failed. 69-0574—2 Check 1.
  • Page 23: Servicing The Thermostat

    The equipment should cycle on and off just enough to keep the room temperature close to the temperature lever settings. If the thermostat seems to cycle the heating system too fast or too slow, adjust the cycle rate by moving the anticipator setting lever one indicator mark at a time (Fig.
  • Page 24: Thermometer Adjustment

    If the set point lever and the thermometer reading do not agree, follow the procedure below. Remove thermostat cover and open the flip-up cover. Set the thermostat cover on a table near thermometer of known accuracy. Allow at least five minutes for cover ther- mometer to sense area temperature, then compare the readings.
  • Page 25 69-0574—2...
  • Page 26 If you have questions regarding the installation and programming of your Honeywell thermostat, please contact the Honeywell Customer Assistance Center at 1-800-468-1502, Monday-Friday, 7:00 AM to 5:30 PM, Central time. Before you call, please have the following information available: make and model of furnace, old thermostat and air conditioner.
  • Page 27: Warranty

    Honeywell warrants this product, excluding battery, 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 28 Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 D.F. ©Honeywell Inc. 1995 69-0574—2 Honeywell Limited—Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Rev. 1-95 Form Number 69-0574—2...

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