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Honeywell Trol-A-Temp T8090T Owner's Manual

Zone thermostat heating/cooling thermostat and subbase or wallplate
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Zone Thermostat
Heating/Cooling Thermostat and
Subbase or Wallplate
Model T8090T
OWNER'S MANUAL
69-0432-1

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  Summary of Contents for Honeywell Trol-A-Temp T8090T

  • Page 1 Zone Thermostat Heating/Cooling Thermostat and Subbase or Wallplate Model T8090T OWNER’S MANUAL 69-0432-1...
  • Page 2 Welcome to the world of energy savings with your new Honeywell Trol-A-Temp Zone Thermostat. Your new thermostat will automatically control the temperature in your home to provide a high level of comfort plus energy savings when programmed according to the instructions in this manual.
  • 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 ... 11 Troubleshooting ... 15 Servicing the Thermostat ... 21 Heat Anticipator Setting ... 21 Thermometer Adjustment ...
  • Page 4: Features Of Your Thermostat

    Thermostat 1 FLIP-UP COVER. Lift it up to set clock for energy savings and normal temperature periods. 2 THERMOSTAT COVER. 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 WALLPLATE Provides mounting base and wiring con- nections for control of zones other than zone 1 in heating or heating-cooling systems. 16 SUBBASE Provides mounting base, wiring connec- tions and manual switching for control of zone 1 in heating or heating-cooling systems.
  • Page 7: Setting The Temperature

    LOW TEMPERATURE SETTING LEVER (BLUE MARK) 50 60 70 80 Fig. 1—Setting high and low temperature setting levers. HIGH TEMPERATURE SETTING LEVER (RED MARK) by Honeywell M641A 69-0432—1...
  • Page 8: Inserting Clock Batteries

    Batteries Power is supplied to the clock by two AAA alkaline batteries (included). Install batteries in thermostat as shown in Fig. 2. Once a year or when batteries are dead, replace with two new AAA alkaline batteries. We recommend ®...
  • 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 a clock- wise direction. DO NOT reverse the minute hand.
  • Page 10: Daylight Savings Time

    Daylight Savings Time When Daylight Savings Time starts, move the minute hand carefully in a clockwise direction one hour. When Daylight Savings Time ends, move the minute hand carefully in a clockwise direction 23 hours. Do NOT reverse the minute hand, or damage to the timer mechanism may occur.
  • Page 11: Programming

    To insert a pin, push it straight into the selected notch on the program dial until it is completely seated. 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, which can be inserted at 10-minute intervals.
  • Page 12 pin is inserted at 6:00 AM for high temperature (comfort period); a blue pin is inserted at 10:00 PM for low temperature (energy saving period). Two additional sets of pins are located in the program pin storage area. You can set up to six temperature changes with the pins supplied. We recomment at least five hours for each energy saving period.
  • Page 13 Setting the Heating Program Decide when you want the temperature to reach the comfort level. Find the notch on the dial that is one-half hour before this time and insert a furnace time to heat the house before you wake up or arrive home. Decide when you want the energy saving period to start and insert a blue...
  • Page 14 Setting the Cooling Program Decide when you want the temperature to reach the comfort level. Find the notch on the dial that is one-half hour before this time and insert a air conditioner time to cool the house before you wake up or arrive home. Decide when you want the energy saving period to start and insert a corresponds to this time.
  • Page 15: Troubleshooting

    —heating equipment for proper operation. —thermostat connections. —airflow at register. Zone damper may be closed. ® Thermostat requires little or no attention. Most problems can be ACTION Move system switch to HEAT position. If blown or tripped, replace fuse or reset breaker.
  • Page 16 Temperature change —program 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. —air flow at register. ACTION Contact a qualified service technicial for assistance.
  • Page 17 HEAT and fan switch is set at AUTO. Move temp- erature setting levers on the appro- priate zone thermostat 5° F [3° C] above room temperature. Heating should start; damper should be open. COOLING—Make sure zone 1 system switch is set at COOL and fan switch is set at AUTO.
  • Page 18 —fuse or circuit breaker. —condenser switch position. Located outdoors and may be turned Off. —cooling equipment for proper operation. —thermostat connections. —airflow at register. Zone damper may be closed. —other. ACTION Move switch to COOL position. If fuse is blown or breaker tripped, replace or reset.
  • Page 19 —area around thermostat for drafts or radiant heat. —calibration of thermometer. Applicable on zone 1 thermostat only. Not applicable on heating-only system. If this Troubleshooting section has not solved the problem, call a qualified Trol-A-Temp customer service at or service technician, 1-800-828-8367 for additional assistance.
  • Page 20 2. Additional (separate) transformer used to power the clock has inadequate voltage. 15 to 30 Vac. 1. Spring fingers on thermostat are not making proper contact with the subbase terminals. 2. Clock has failed. POSSIBLE CAUSE...
  • Page 21: Servicing The Thermostat

    Servicing the Thermostat Heat Anticipator Setting The T8090T Thermostat has an adjustable heat anticipator that was factory-set at 0.1A. The heat anticipator must be set at 0.1A for proper system operation. See Fig. 6. MOVE INDICATOR TO 0.1A Fig. 6—Heat anticipator setting.
  • Page 22: Thermometer Adjustment

    If the setpoint lever and the thermometer reading do not agree, follow the procedure below. Remove the thermostat cover and open the flip-up cover. Set the thermostat cover on a table near a thermometer of known accuracy. Allow at least five minutes for the cover thermometer to sense the area tempera- ture;...
  • Page 23 If you have questions regarding the installation and programming of your Honeywell Trol-A- ® ® Temp Thermostat, please contact a Trol-A-Temp customer servoce re[resentative at 1-800- 828-8367. Before you call, please have the following information available: Make and model of your furnace, old thermostat and air conditioner.
  • Page 24 Home and Building Control Honeywell Inc. 1985 Douglas Drive No. Golden Valley, MN 55422 D.F. ©Honeywell Inc. 1995 Printed in Mexico Home and Building Control Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 Rev. 1-95 Form Number 69-0432—1...