HONEYWELL T8090A Heating or Cooling Thermostat OWNERS MANUAL

HONEYWELL T8090A Heating or Cooling Thermostat  

INTRODUCTION

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. This allows you to significantly lower your fuel costs, while awakening (or returning home) to a comfortable temperature. Read this manual to learn how to use your new thermostat.

Recycling Notice

This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube. If you have questions, call Honeywell Inc. at 1-800-468-1502.

Features Of Your Thermostat

• FLIP-UP COVER. Lift it up to set clock for energy savings and normal temperature periods.
•  THERMOSTAT COVER. Lift up and remove to adjust heat anticipator.
•  THERMOMETER. Provides accurate room temperature reading.
•  CLOCK. This clock provides a 24-hour slotted dial to hold the programming pins.
•  CLOCK HANDS. Turn minute hand clockwise to match the correct AM or PM time to the time indicator.
•  TIME INDICATOR. Arrow head indicates time for 24-hour dial.
•  PROGRAM INDEX WHEEL. Controls high and low temperatures at a specific time of day as set by program pins
• TEMPERATURE SETTING LEVERS. Left (blue mark) controls the low temperature, right (red mark) controls the high temperature
• PROGRAM PINS. Must be inserted into 24-hour clock dial slots to control program index wheel.
•  PIN SLOTS. Located on 24-hour dial at 10-minute intervals for program pin insertion.
•  MANUAL PROGRAM ADVANCE BUTTON. Allows change from comfort to energy savings setting and vice versa without changing the program.
•  HEAT ANTICIPATOR SCALEPLATE. Calibrated to match the heating system current draw in amperes.
•  ANTICIPATOR SETTING LEVER. Must be adjusted to match the heating system primary control current.
•  MERCURY BULB AND BIMETAL ELEMENT (2). Provide automatic temperature control by switching the heating or cooling system on or off
• 191108AJ WALLPLATE. Provides mounting base and wiring connections for heating-only or cooling-only thermostat.
•  Q682B SUBBASE. Provides mounting base, wiring connections and manual switching control for heating/cooling thermostat.

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 temperature 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.

For Cooling:
Set the left lever (blue mark) to the temperature you want for normal comfort periods. Set the right lever (red mark) to the energy savings temperature you want when you are sleeping or your home is unoccupied.

Inserting Clock Batteries

Power is supplied to the clock by the 24 Vac transformer, by two AAA alkaline batteries (included), or by the heating or cooling control circuit. Backup batteries may be installed to supply power to the clock if power is interrupted when using 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. We recommend Energizer® 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 clockwisedirection. 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.

EXAMPLE: For 11 PM, the time indicator arrow will point directly to dark band. For 11 AM, the arrow will point to light band on 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 timer mechanism may occur

Programming

You can program your thermostat to automatically lower and raise the temperature one or more times every 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. Three red and three blue program pins are included with your thermostat. The red pins start the high-temperature period; the blue pins start the low-temperature period. A heating program has been preprogrammed. A red 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 recommend at least five hours for each energy-saving period

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. DO NOT attempt to change a pin if it is engaged with the program index wheel.
•  On heating/cooling systems, you must reset the pins when the seasons change. You will also probably want to change the lever positions

Setting the Heating 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 insert a red pin. The half-hour head start gives the furnace time to heat the house before you wake up or arrive home. Setting the Heating 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 insert a red pin. The half-hour head start gives the furnace time to heat the house before you wake up or arrive home.

		WINTER			SUMMER
		TEMPERATURE		PROGRAM PIN IN CONTROL	TEMPERATURE		PROGRAM PIN IN CONTROL
		OF	OC		OF	OC
NIGHT ENERGY SAVING PERIOD	BEGINS 10:00 PM	58	14	BLUE	80	27	RED
	ENDS 6:00 AM	68	20	RED	75	24	BLUE
DAY ENERGY SAVING PERIOD	BEGINS 7:30 AM	58	14	BLUE	80	27	RED
	ENDS 4:00 PM	68	20	RED	75	24	BLUE

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 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 savings period to start and insert a red pin at the notch that corresponds to this time. After the red pin engages, the air conditioner will be off until room temperature rises to the energy savings set point.

Start Or End Programs With Manual Program Advance Button

Press the button to immediately begin an energy savings period or return to the normal setting. After pressing the button, check the program indicator to ensure the system is in the desired mode. If the program indicator shows blue, the lower temperature is in effect; if it shows red, the higher temperature is in effect. Using the manual advance button will not affect the stored program.

Troubleshooting

Problem	Check	Action
No heat.	— system switch. May be in OFF or COOL position.    1	Move system switch to HEAT position.
	— fuse or circuit breaker.	If blown or tripped, replace fuse or reset breaker.
	— furnace power switch. May be Off.	Move switch to ON.
	— pilot flame. May be out.	Relight pilot flame per furnace manufacturers instructions.
	— R and W thermostat connections.	Turn Off power to furnace. Check for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws. Turn On power.
	— other problem.	Contact a qualified service technician for assistance.

Problem	Check	Action
Energy savings temperature program 12 hours off.	— program dial for proper day or night phase.	Turn timer ahead 12 hours. Move setting knob clockwise  only.
Rooms do not warm up at programmed time. 2	— timer program for heating system. May need more time to warm up rooms.	Move red pin one-half hour earlier on the program dial.
Temperature change occurs at the wrong time.	— programs pins for correct time locations.	Relocate pins to desired settings.
Room temperatures are not correct.	— positions of thermostat setpoint levers.	Reset to desired temperatures.
	— position of subbase system switch.	Move to desired operating position.

Problem	Check	Action
Room temperatures are not correct (continued).	— thermostat circuits.	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) below room temperature. Cooling system should start. If the system does not operate, call a qualified technician. HEATING/COOLING SYSTEM—With system switch at HEAT, move temperature setting levers 5°F (3°C) above room temperature. Heating system should start.

Problem	Check	Action
Room Temperatures are not correct (continued).		With system switch at COOL, move temperature setting levers 5°F (3°C) below room temperature. Cooling system should start. If the systems do not operate, call a qualified technician.
Burner-on time too short.	— anticipator setting. (See figure on page 23 for anticipator location.)	Increase anticipator setting by 0.05. Observe burner operation.
Burner-on time too long.	— anticipator setting. (See figure on page 23 for anticipator location.)	Decrease anticipator setting by 0.05. Observe burner operation.
No cooling.       1	— system switch. May be in OFF or HEAT position.	Move switch to COOL position.
	— fuse or circuit breaker.	If fuse is blown or breaker tripped, replace or reset.

Problem	Check	Action
No cooling          1 (continued)	— condenser switch position. Located outdoors and may be turned OFF.	Move to ON position.
	— thermostat connections. Check for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws.	Turn OFF power to cooling system.
	— other.	Contact a qualified service technician for assistance.
Thermostat setting and thermometer	— level position of thermostat.	Reinstall thermostat wallplate or subbase. Use a spirit level.
reading disagree.	— area around thermostat for drafts or radiant heat.	Thermostat should be about 5 ft (1.5m) above floor on an inside wall. Contact qualified service technician for change of location.

Problem	Check	Action
Thermostat setting and thermometer reading disagree (continued).	— calibration of thermometer.	See instructions on page 24.
Clock does not run.	— thermostat connections at the two C terminals. If no connections, clock needs batteries in order to run.      3 Batteries may not have been installed. Batteries may need replacement	Install as shown on page 8.   Replace with two new AAA alkaline batteries as shown on page 8.
	— if new batteries are installed and clock still does not run.	Replace thermostat.
	— voltage across the two C terminals.	Remove thermostat from the wallplate or subbase and measure the voltage. Refer to the table on page 22 for cause and reaction.

Problem	Check	Action
Clock does not run (continued).	— pins in program dial. If pins are not completely seated in program dial, jamming with index wheel may occur.	Push down on pins to make sure they are completely seated in program dial.
Clock loses time.	— power. May be interrupted.	Make sure power is on. Reset clock.
	— high limit control. If clock powered through system transformer, power to clock and equipment may be off on safety.	Wire separate transformer to power clock, or install backup batteries as shown on page 8.
	— filter. May be clogged. Safety limit on equipment may cut off power to system.	Replace filter and reset clock.

Problem	Check	Action
Clock loses time (continued).	— batteries may need replacement.	Replace with two new AAA alkaline batteries as shown on page 8. We recommend Energizer® batteries.

Voltage At Clock Terminals

AC Voltge at C-C Terminals	Check	Action
0 Vac.	1.    System power off. 2.    Short in clock power supply wiring. 3.    Limit switch contacts stuck open. 4.    Transformer supplying power is burned out.	1.   Restore power. 2.   Replace wiring. 3.   Free or replace limit switch. 4.   Replace transformer.
Up to 15 Vac.	1.    System transformer used to power the clock is inadequate. 2.    Additional (separate) transformer used to power the clock has inadequate voltage.	1.   Use additional (separate) transformer. 2.   Install transformer with proper secondary voltage.
15 to 30 Vac.	1.    Spring fingers o thermostat not making proper contact with subbase terminals. 2.    Clock has failed.	1.   Rebend spring fingers to a 45 degree angle to ensure proper contact. 2.   Replace thermostat.

Servicing The Thermostat Cycle Rate Adjustment 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. 6). Observe the heating system operation after each adjustment.

Thermometer Adjustment

The thermometer has been accurately calibrated at the factory and should only need adjustment if it has been dropped or mishandled. 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 thermometer to sense area temperature, then compare the readings. Be careful not to touch thermometer or breathe on it. If the readings are the same, replace cover and put the system into operation. If the readings are different, insert a small screwdriver in the thermometer slot, shown in Fig. 7, and turn it until both thermometers read the same. Replace thermostat cover and put the system into operation.

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

Warranty

Limited One-Year 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.

If the product is defective,

•  return it, with a bill of sale or other dated proof of purchase, to the dealer or contractor from which you purchased it, or
•  package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid, to the following address:

Honeywell Inc. in Canada
Returned Goods Department
Honeywell Limited/Honeywell Limitee
1050 Berkshire Lane 740 Ellesmere Road
Plymouth, MN 55441-4437 Scarborough, Ontario M1P2V9

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. Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

If you have any questions concerning this warranty, please write our Customer Assistance Center, Honeywell Inc., P.O. Box 524, Minneapolis, MN 55440- 0524 or call 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time.

Automation and Control Solution

• Honeywell International Inc.
• 1985 Douglas Drive North
• Golden Valley, MN 55422
• Honeywell Limited—Honeywell Limitée
• 35 Dynamic Drive
• Scarborough, Ontario M1V 4Z9

Reference

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HONEYWELL T8090A Heating or Cooling Thermostat OWNERS MANUAL

HONEYWELL T8090A Heating or Cooling Thermostat OWNERS MANUAL