Honeywell T8090T Thermostat User Manual

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 indepen-

dent control of each zone provides additional energy savings.

Recycling Notice

M3375

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 the control, or of an old control containing mercury in a sealed tube.

If you have questions, call Honeywell Inc. at 1-800-468-1502.

69-0432—1

Table of Contents

PAGE

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............................................................................................................ 22

69-0432—1

FLIP-UP COVER. Lift it up to set clock for

energy savings and normal temperature

periods.

THERMOSTAT COVER.

THERMOMETER. Provides accurate room

temperature reading.

Features ofYour

Thermostat

CLOCK. This clock provides a 24-hour

slotted dial to hold the programming pins.

CLOCK HANDS. Turn minute hand clock-

wise

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 temperature at specific time of

day as set by program pins.

M8693

TEMPERATURE SETTING LEVERS. Left

(

blue mark) controls the low temperature;

right (red mark) controls the high tempera-

ture.

69-0432—1

PROGRAM PINS. Must be inserted into

4-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

set at 0.1A for proper system operation.

MERCURY BULB AND BIMETAL

ELEMENT(2). Provide automatic tempera-

ture control by switching the heating or

cooling system on and off.

M8691

69-0432—1

WALLPLATE

Provides mounting base and wiring con-

nections for control of zones other than

zone 1 in heating or heating-cooling

systems.

SUBBASE

Provides mounting base, wiring connec-

tions and manual switching for control of

zone 1 in heating or heating-cooling

systems.

M2421

M8690

69-0432—1

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 unoccu-

pied.

HIGH

LOW TEMPERATURE

SETTING LEVER

(BLUE MARK)

TEMPERATURE

SETTING

LEVER

(RED MARK)

■

Set the right lever (red mark) to the temp-

erature you want for normal comfort

periods.

60 70

NOTE: You may override the time program by

setting both the red and blue levers to the

same temperature setpoint.

60 70 80

by Honeywell

For Cooling:

■

Set the left lever (blue mark) to the tempera-

ture you want for normal comfort periods.

Set the right lever (red mark) to the energy

savings temperature you want when you are

sleeping or the associated zone is unoccu-

pied.

M641A

■

Fig. 1—Setting high and low

temperature setting levers.

69-0432—1

BATTERY LOCATION FOR

2) AAA BATTERIES;

INSTALL WITH POSITIVE

ENDS UP

Inserting Clock

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

Energizer batteries.

M7188

Fig. 2—Inserting clock batteries.

69-0432—1

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-

MINUTE

HAND

wise

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

TIME

INDICATOR

ARROW

(

dark) band of the program dial.

EXAMPLE: For 11 PM, the time indicator arrow

will point directly to the dark band. For 11 AM,

the arrow will point to them light band on the

dial.

M8561

Fig. 3—Setting the clock.

69-0432—1

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.

69-0432—1

4-HOUR PROGRAM DIAL

Programming

(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.

PROGRAM

PINS

■

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.

THERMOSTAT

COVER

■

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 is preprogrammed. A red

PROGRAM PIN SLOT

PROGRAM PIN

STORAGE

PROGRAM INDEX WHEEL

TIME INDICATOR

ARROW

MANUAL PROGRAM

ADVANCE BUTTON

M8692

Fig. 4—Program components.

69-0432—1

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. DO NOT attempt

to change a pin if it is engaged with the program index wheel.

■

On heating/cooling systems, be sure to reset the pins when the seasons change. You will also

probably want to change the lever positions.

69-0432—1

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

PROGRAM

TEMPERATURE

PIN IN

blue pin at the notch that corre-

sponds to this time. After the blue

pin engages, the furnace will be off

until room temperature drops to the

energy saving setpoint.

PROGRAM

TEMPERATURE PIN IN

°C

CONTROL

°F

°C

CONTROL

BEGINS

0:00 PM

BLUE

RED

BLUE

RED

NIGHT

ENERGY

SAVING ENDS

PERIOD 6:00 AM

RED

BLUE

RED

■

You can set both a day and a night

program. See Fig. 5 for program

examples.

DAY

BEGINS

ENERGY 7:30 AM

SAVING

PERIOD

ENDS

BLUE

M626A

4:00 PM

Fig. 5—Programming examples.

69-0432—1

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. After the red pin engages, the air conditioner will be off until the room

temperature rises to the energy saving setpoint.

Start or End Programs With Manual Program Advance Button

IMPORTANT

To prevent damage to the program 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.

Press the button to immediately begin an energy saving period or return to the normal setting.

After pressing the button, check the program indicator to assure the system is in the desired

mode. If the program indicator shows blue, the lower temperature is in effect; if the program

indicator shows red, the higher temperature is in effect. Using the manual advance button will not

affect the stored program.

69-0432—1

Troubleshooting

Your Honeywell Trol-A-Temp Thermostat requires little or no attention. Most problems can be

traced to the following.

PROBLEM

CHECK

ACTION

No heat.

—system switch. May be in OFF or Move system switch to HEAT

COOL position.

position.

—

fuse or circuit breaker.

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. Check for correct

terminal hookups. Repair any frayed

or broken wires. Firmly tighten all

terminal screws.

—

airflow at register. Zone damper

If damper is closed, contact a

qualified service technician for

assistance.

may be closed.

(

continued)

69-0432—1

Troubleshooting (continued)

PROBLEM

CHECK

ACTION

No heat.

—other.

Contact a qualified service technicial

for assistance.

Energy saving

—program dial for proper day or

Turn clock ahead 12 hours. Move

minute hand clockwise only.

temperature program night phase.

12 hours off.

Rooms do not warm —timer program for heating system. Move red pin one-half hour earlier on

up at programmed

time.

May need more time to warm up

rooms.

the program dial.

Temperature change —program pins for correct time

occurs at the wrong locations.

time.

Relocate pins to desired settings.

Room temperatures —positions of thermostat setpoint

Reset to desired temperatures.

are not correct.

levers.

—

position of subbase system

Move to desired operating position.

switch.

—

air flow at register.

Damper may be operating improperly.

Contact a qualified service technician

for assistance.

(

continued)

69-0432—1

Troubleshooting (continued)

PROBLEM

CHECK

ACTION

Room temperatures —thermostat circuits.

are not correct.

HEATING—Make sure zone 1 sy-

stem switch is set at 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. Move temp-

erature setting levers on the

appropriate zone thermostat 5° F

[

3° C] below room temperature.

Cooling should start; damper should

open. IF SYSTEMS DO NOT

OPERATE, CONTACT A QUALIFIED

SERVICE TECHNICIAN.

(

continued)

69-0432—1

Troubleshooting (continued)

PROBLEM

CHECK

ACTION

No cooling.

—system switch. May be in OFF or Move switch to COOL position.

HEAT position.

—

fuse or circuit breaker.

If fuse is blown or breaker tripped,

replace or reset.

—

condenser switch position.

Move to ON position.

Located outdoors and may be

turned Off.

—

cooling equipment for proper

See manufacturer instructions.

operation.

—

thermostat connections.

Turn Off power. Check for correct

terminal hookups. Repair any frayed

or broken wires. Firmly tighten all

terminal screws.

—

airflow at register. Zone damper

If damper is closed, contact a

qualified service technician for

assistance.

may be closed.

—

other.

Contact a qualified service technician

for assistance.

(

continued)

69-0432—1

Troubleshooting (continued)

PROBLEM

CHECK

ACTION

Clock does not run. —voltage across the C and R

terminals.

Remove thermostat from the wall-

plate or subbase, and measure the

voltage. Refer to page 20 for cause

and action.

Thermostat setting

and thermometer

reading disagree.

—level position of thermostat.

Reinstall thermostat wallplate or

subbase. Use a spirit level.

—

area around thermostat for drafts Thermostat should be about 5 ft

[1.5m] above floor on an inside wall.

Contact qualified service technician

for change of location.

or radiant heat.

—

calibration of thermometer.

See instructions on page 22.

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.

69-0432—1

Voltage at Clock Terminals

AC VOLTAGE AT

C-R TERMINALS

POSSIBLE CAUSE

CHECK

ACTION

1. Restore power.

Vac

1. System power is Off.

Short in clock power supply wiring. 2. Replace wiring.

Limit switch contacts stuck open.

3. Free or replace limit switch.

4. Replace transformer.

Transformer supplying power is

burned out.

Up to 15 Vac.

1. System transformer used to power 1. Use additional (separate)

the clock is inadequate. transformer.

Additional (separate) transformer

used to power the clock has

inadequate voltage.

2. Install transformer with proper

secondary voltage.

15 to 30 Vac.

1. Spring fingers on thermostat are

not making proper contact with the

subbase terminals.

1. Rebend spring fingers to a 45

degree angle to assure proper

contact.

Clock has failed.

2. Replace the thermostat.

69-0432—1

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.

69-0432—1

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.

Allow at least five minutes for the cover

thermometer to sense the area tempera-

ture; then compare the readings. Be careful

not to touch the thermometer or breathe on

it.

THERMOMETER

SLOT

BACKSIDE OF

FLIP-UP COVER

If the readings are the same, replace the

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.

INSERT AND TURN

SCREWDRIVER

Replace thermostat cover and put the

system into operation.

M1810

Fig. 7—Thermometer adjustment.

69-0432—1

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-

28-8367. Before you call, please have the following information available: Make and model of

your furnace, old thermostat and air conditioner.

69-0432—1

Home and Building Control Home and Building Control

Honeywell Inc. Honeywell Limited—Honeywell Limitée

985 Douglas Drive No.

Golden Valley, MN 55422

Helping You Control Your World

740 Ellesmere Road

Scarborough, Ontario

M1P 2V9

Rev. 1-95 Form Number 69-0432—1

M3375