Zone Thermostat Heating/Cooling Thermostat and Subbase or Wallplate Model T8090T OWNER’S MANUAL 69-0432-1
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. With zone control, you heat or cool each zone or living area only when needed. The independent control of each zone provides additional energy savings. Recycling Notice M3375 This control contains mercury in a sealed tube.
Table of Contents PAGE Features of Your Thermostat ............................................................................................................ 4 Setting the Temperature ................................................................................................................... 7 Inserting Clock Batteries ................................................................................................................... 8 Setting the Clock ..............................................
Features of Your Thermostat 1 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. 5 CLOCK HANDS. Turn minute hand clockwise to match the correct AM or PM time to the time indicator. 6 TIME INDICATOR. Arrow head indicates time for 24-hour dial. 7 PROGRAM INDEX WHEEL.
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. 12 HEAT ANTICIPATOR SCALEPLATE. Calibrated to match the heating system current draw in amperes. 13 ANTICIPATOR SETTING LEVER. Must be set at 0.1A for proper system operation.
15 WALLPLATE Provides mounting base and wiring connections for control of zones other than zone 1 in heating or heating-cooling systems. 16 SUBBASE Provides mounting base, wiring connections and manual switching for control of zone 1 in heating or heating-cooling systems.
Setting The Temperature For Heating: ■ Set the left lever (blue mark) to the energy savings temperature you want when you are sleeping or the associated zone is unoccupied. ■ Set the right lever (red mark) to the temperature you want for normal comfort periods. HIGH TEMPERATURE SETTING LEVER (RED MARK) LOW TEMPERATURE SETTING LEVER (BLUE MARK) 50 60 70 80 12 NOTE: You may override the time program by setting both the red and blue levers to the same temperature setpoint.
Inserting Clock Batteries BATTERY LOCATION FOR (2) AAA BATTERIES; INSTALL WITH POSITIVE ENDS UP 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 Energizer® batteries. M7188 Fig. 2—Inserting clock batteries.
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 clockwise direction. DO NOT reverse the minute hand. When time is correctly set, the time indicator arrow (see Fig. 3) will point to the correct time and corresponding daytime (light) or nighttime (dark) band of the program dial.
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.
Programming 24-HOUR PROGRAM DIAL (GRAY AREA FOR NIGHT SETTINGS You can program your thermostat to automatically lower and raise the temperature one or more times every 24 hours. FLIP-UP COVER Before setting your program ■ 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.
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. ■ To change the pins add a new energy saving period. ■ To remove a pin, press against the program dial and pull the pin straight out.
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 red pin. The half-hour head start gives the 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 WINTER SUMMER blue pin at the notch that correPROGRAM PROGRAM TEMPERATURE PIN IN TEMPERATURE PIN IN sponds to this time.
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 blue pin. The half-hour head start gives the 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 red pin at the notch that corresponds to this time.
Troubleshooting Your Honeywell Trol-A-Temp® Thermostat requires little or no attention. Most problems can be traced to the following. PROBLEM No heat. CHECK —system switch. May be in OFF or COOL position. 1 —fuse or circuit breaker. ACTION Move system switch to HEAT position. If blown or tripped, replace fuse or reset breaker. —furnace power switch. May be Off. Move switch to ON. —heating equipment for proper See manufacturer’s instructions. operation. —thermostat connections. Turn Off power.
Troubleshooting (continued) PROBLEM No heat. CHECK —other. Energy saving temperature program 12 hours off. Rooms do not warm up at programmed time. Temperature change occurs at the wrong time. Room temperatures are not correct. —program dial for proper day or night phase. ACTION Contact a qualified service technicial for assistance. Turn clock ahead 12 hours. Move minute hand clockwise only. —timer program for heating system.
Troubleshooting (continued) PROBLEM Room temperatures are not correct. CHECK —thermostat circuits. ACTION HEATING—Make sure zone 1 system switch is set at HEAT and fan switch is set at AUTO. Move temperature setting levers on the appropriate 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.
Troubleshooting (continued) PROBLEM No cooling. 2 CHECK —system switch. May be in OFF or HEAT position. 1 —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. 18 ACTION Move switch to COOL position. If fuse is blown or breaker tripped, replace or reset. Move to ON position. See manufacturer instructions. Turn Off power.
Troubleshooting (continued) PROBLEM Clock does not run. CHECK —voltage across the C and R terminals. Thermostat setting and thermometer reading disagree. —level position of thermostat. —area around thermostat for drafts or radiant heat. —calibration of thermometer. 1 2 ACTION Remove thermostat from the wallplate or subbase, and measure the voltage. Refer to page 20 for cause and action. Reinstall thermostat wallplate or subbase. Use a spirit level. Thermostat should be about 5 ft [1.
Voltage at Clock Terminals AC VOLTAGE AT C-R TERMINALS 0 Vac Up to 15 Vac. 1. 2. 3. 4. 1. 2. 15 to 30 Vac. 1. 2. POSSIBLE CAUSE CHECK System power is Off. Short in clock power supply wiring. Limit switch contacts stuck open. Transformer supplying power is burned out. System transformer used to power the clock is inadequate. Additional (separate) transformer used to power the clock has inadequate voltage. Spring fingers on thermostat are not making proper contact with the subbase terminals.
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 M8596 Fig. 6—Heat anticipator setting.
Thermometer Adjustment The thermometer was accurately calibrated at the factory and should only need adjustment if it was dropped or mishandled. 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.
If you have questions regarding the installation and programming of your Honeywell Trol-ATemp® Thermostat, please contact a Trol-A-Temp® customer servoce re[resentative at 1-800828-8367. Before you call, please have the following information available: Make and model of your furnace, old thermostat and air conditioner.
Home and Building Control Honeywell Inc. 1985 Douglas Drive No. Golden Valley, MN 55422 Home and Building Control Helping You Control Your World Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 D.F. ©Honeywell Inc. 1995 Printed in Mexico Rev.
