Honeywell T8095A191108AJ Thermostat User Manual

Welcome to the world of energy savings with

your new Honeywell thermostat. The Honeywell

name is your assurance of accurate control and

reliable operation for years to come.

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.

Your new thermostat will automatically lower and

raise the temperature in your home one or more

times every 24 hours. This allows you to signifi-

cantly lower your fuel costs, while awakening (or

returning home) to a comfortable temperature.

If this control is replacing a control that contains

mercury in a sealed tube, do not place your old

control in the trash.

Read this manual to learn how to use your new

thermostat.

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.

Table of Contents

Page

Features of Your Thermostat ............................................................................................................. 4

Setting the Temperature ..................................................................................................................... 7

Setting Subbase Switches ................................................................................................................. 8

Inserting Clock Batteries .................................................................................................................... 9

Setting the Clock...............................................................................................................................10

Programming .................................................................................................................................... 11

Troubleshooting ................................................................................................................................15

Servicing the Thermostat ..................................................................................................................23

Cycle Rate Adjustment .................................................................................................................23

Thermometer Adjustment .............................................................................................................24

Warranty ...........................................................................................................................................27

69-0639—1

Features of Your

THERMOSTAT COVER. Lift up and

remove to adjust heat anticipator.

THERMOMETER. Provides accurate room

temperature reading.

PROGRAM INDICATOR. Blue indicates low

temperature is in effect; red indicates high

temperature is in effect.

Thermostat

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 (triangle

shape) indicates blue (low) temperature

setting or red (high) temperature setting in

control on program index wheel. Also

indicates time on 24-hour dial.

M7318

FLIP-UP COVER. Lift up to set clock for

energy savings and normal temperature

periods.

PROGRAM INDEX WHEEL. Controls high

and low temperature at specific time of day

as set by program pins.

TEMPERATURE SETTING LEVERS. Left

blue mark) controls low temperature and

16 MERCURY BULB AND BIMETAL ELE-

MENT (2). Provide automatic temperature

control by switching the heating or cooling

system on or off.

(

right (red mark) controls the high temperature.

0 PROGRAM PINS. Insert into 24-hour clock

dial slots to control program index wheel.

PIN SLOTS. Located on 24-hour dial at

0-minute intervals for program pin insertion.

PROGRAM DIAL. 24-hour dial with light

band to indicate daytime and dark band to

indicate nighttime.

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. Adjust to

match the heating system primary control

current.

M7316

69-0639—1

191108 WALLPLATE. Provides mounting

base and wiring connections for heating-

only or cooling-only thermostat.

Q682 SUBBASE (not included with

thermostat; ordered separately). Provides

mounting base, wiring connections and

manual switching control for heating/cooling

thermostat. See Setting Subbase Switches

section for additional information.

FAN

COOL

AUTO

HEAT

OFF

M1809

Setting the Temperature (Fig. 1)

For Heating:

■

Set the left lever (blue mark) to the energy

savings temperature you want when you are

sleeping or your home is unoccupied.

HIGH

LOW TEMPERATURE

SETTING LEVER

TEMPERATURE

SETTING

LEVER

(BLUE MARK)

■

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

ture you want for normal comfort periods.

(RED MARK)

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

1 0

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 your home is unoccupied.

M1520

■

Fig. 1—Setting high and low temperature levers.

69-0639—1

Setting Subbase Switches (If Applicable)

The subbase system switch controls system

operation as follows:

The subbase fan switch controls fan operation

as follows:

HEAT—Heating system is controlled by the

thermostat. Cooling system is off.

COOL—Cooling sytem is controlled by the

thermostat. Heating system is off.

OFF—Both the heating and cooling sytems are

off. If the fan switch is in the AUTO position,

the fan is also off.

ON—Fan operates continuously.

AUTO—Fan operates with cooling equipment as

controlled by the thermostat or with heating

equipment as controlled by the plenum fan

switch. In electric heat, heat pump and fan coil

systems, the fan is controlled by the thermo-

stat in heating and cooling.

AUTO—In cooling only application, only cooling

operates. In heating only applications, only

heating operates.

To switch positions, use thumb or index finger

to slide lever to desired position. Switch lever

must stop in detent over desired function

indicator mark for proper circuit operation.

Inserting Clock Batteries

BATTERY LOCATION FOR

2) AAA BATTERIES;

INSTALL WITH POSITIVE

ENDS UP

Power is supplied to the clock by the 24 Vac

transformer. Backup batteries (not included) may

be installed to supply power to the clock when

power is interrupted. Install batteries in thermo-

stat 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.

69-0639—1

Setting the Clock

■

Lift thermostat flip-up cover to 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.

After setting the time correctly, the Time

Indicator Arrow (triangle shape) will point to

the correct time and corresponding daytime

one hour. When Daylight Savings Time ends, move

the minute hand carefully in a clockwise direc-

tion 23 hours. Do not reverse the minute hand, or

damage to the timer mechanism may occur.

PROGRAM DIAL

■

MINUTE

HAND

(

light) or night-time (dark) band of the program

dial. See Fig. 3.

EXAMPLE: For 11 PM, the time indicator arrow

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

the arrow will point to the light band on the dial.

TIME

INDICATOR

ARROW

Daylight Savings Time

TIME INDICATOR ARROW

When Daylight Savings Time starts, move the

M1813

minute hand carefully in a clockwise

direction

Fig. 3—Setting the clock.

Programming

You can program your thermostat to automati-

cally lower and raise the temperature one or

more times every 24 hours, depending on the

number of program pins used.

4-HOUR PROGRAM DIAL

(GRAY AREA FOR

NIGHT SETTINGS

FLIP-UP

COVER

Before setting your program

■

Lift thermostat flip-up cover to find the 24-hour

program dial. The slots on the program dial

PROGRAM

PINS

(Fig. 4) are for the program pins that can be

inserted at 10-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 is preprogrammed. A red pin

is inserted at 6:00 A.M. for high-temperature

THERMOSTAT

COVER

PROGRAM PIN SLOT

PROGRAM PIN

STORAGE

PROGRAM INDEX WHEEL

TIME INDICATOR

ARROW

MANUAL PROGRAM

ADVANCE BUTTON

M7319

(

comfort period); a blue pin is inserted at

0:00 P.M. for low-temperature (energy saving

Fig. 4—Program Components.

69-0639—1

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.

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 is one-half hour before this time and

insert a red pin. The high temperature is in

effect. The half-hour head start period gives

the furnace time to heat the house before you

awaken or arrive home.

■

To change the pins or add a new energy

saving period—

•

To insert a pin, push it straight into the

selected notch on the program dial until it is

completely seated.

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.

■

Decide when you want the energy savings

period to start and insert a blue pin at the notch

that corresponds to this time. After the blue pin

engages, the low temperature is in effect. The

furnace will be off until room temperature drops

to the energy saving setpoint.

•

On heating/cooling systems, set the

subbase switches to the desired positions.

See Setting Subbase Switches section.

On heating/cooling systems, you must reset

the pins when the seasons change. You will

You can set both a day and a night program.

See Fig. 5 for program examples.

WINTER

PROGRAM

SUMMER

PROGRAM

TEMPERATURE PIN IN

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 low temperature is in

effect. The half-hour head start period gives

the air conditioner time to cool the house

before you awaken or arrive home.

TEMPERATURE PIN IN

°C

CONTROL

°F

°C

CONTROL

NIGHT

BEGINS

ENERGY 10:00 PM

BLUE

RED

SAVING ENDS

PERIOD 6:00 AM

RED

BLUE

RED

BLUE

RED

DAY

BEGINS

ENERGY 7:30 AM

SAVING

PERIOD

ENDS

BLUE

4:00 PM

M1690B

■ 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 high temperature is in effect.

The air conditioner will be off until room

temperature rises to the energy saving

setpoint.

Fig. 5—Programming Examples.

69-0639—1

Press the button to immediately begin an

energy savings period or return to the normal

setting. After pressing the button, check the

program indicator on the thermostat cover to

assure the system is in the desired mode. If the

program indicator shows blue, the lower tempera-

ture is in effect; if it shows red, the higher

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.

temperature is in effect. Using the manual

advance button will not affect the stored program.

The manual program advance button enables

immediate, one-time-only program changes to

accommodate temporary schedule changes.

Troubleshooting

Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to

the following:

Problem

Check

Action

No heat.

—system switch. May be in OFF

or COOL position.

Move system switch to HEAT position.

See page 8.

—

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 according to furnace

manufacturer’s instructions.

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.

(Continued)

69-0639—1

Troubleshooting (Continued)

Problem

Check

other.

Action

—

Contact a qualified service technician

for assistance.

Energy savings

temperature pro-

gram 12 hours off.

—program dial for proper day

or night phase.

Turn clock ahead 12 hours. Move

minute hand clockwise

only.

Rooms do not

warm up at pro-

grammed time.

—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.

—program pins for correct time

locations.

Relocate pins to desired settings.

Reset to desired temperatures.

Room

temperatures

are not correct.

—positions of thermostat set

point levers.

—

position of subbase system

switch (heating-cooling model).

Move to desired operating position.

Refer to page 8.

(Continued)

Troubleshooting (Continued)

Problem

Check

Action

Room

temperatures

are not correct

—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 service 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 service technician.

HEATING/COOLING SYSTEM—With

system switch at HEAT, move tempera-

ture setting levers 5° F [3° C] above

room temperature. Heating system

should start. With system

(continued).

(Continued)

69-0639—1

Troubleshooting (Continued)

Problem

Check

Action

Room

temperatures

are not correct

switch at COOL, move temperature

setting levers 5° F [3° C] below room

temperature. Cooling system should

start. If the system does not operate, call

a qualified service technician.

(continued).

Burner-on time

too short.

—anticipator setting. (See Fig. 6

for anticipator location.)

Increase anticipator setting by 0.05.

Observe burner operation.

Burner-on time

too long.

—anticipator setting. (See Fig. 6

for anticipator location.)

Decrease anticipator setting by 0.05.

Observe burner operation.

No cooling.

—system switch. May be in OFF

or HEAT position.

Move switch to COOL position.

See page 8.

—

fuse or circuit breaker.

If fuse is blown or breaker tripped,

replace or reset.

(Continued)

Troubleshooting (Continued)

Problem

Check

Action

No cooling

(

—condenser switch position.

(Located outdoors and may

be turned OFF.)

Move to ON position.

continued).

—

thermostat connections. Check

for correct terminal hookups.

Turn OFF power to cooling system.

Repair any frayedor broken wires.

Firmly tighten all terminal screws.

—

other.

Contact a qualified service technician

for assistance.

Thermostat setting —level position of thermostat.

and thermometer

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 a

qualified service technician for change

of location.

(Continued)

69-0639—1

Troubleshooting (Continued)

Problem Check

Action

Thermostat setting —calibration of thermometer.

and thermometer

See instructions on page 24.

reading disagree.

(continued).

Clock does not run. —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.

—

pins in program dial. If pins are

Push down on pins to make sure they

are completely seated in program dial.

not completely seated in

program dial, jamming with

index wheel may occur.

Clock loses time.

—power. May be interrupted.

Make sure power is on. Reset clock.

(Continued)

Troubleshooting (Continued)

Problem

Check

Action

Clock loses time.

—high limit control. If clock-

powered through system trans-

former, power to clock and

Wire separate transformer to power

clock, or install backup batteries as

shown on page 9.

(continued).

equipment may be off for safety.

—

filter. May be clogged. Safety

limit on equipment may cut off

power to system.

Replace filter and reset clock.

—

backup batteries may need

replacement.

Replace with two new AAA alkaline

batteries. See page 9.

Not applicable on model used in heating-only system.

Not applicable on model used in cooling-only system.

If this Troubleshooting section has not solved the problem, call a qualified service technician or

Honeywell Assistance Center, 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time,

for additional assistance.

69-0639—1

Voltage at Clock Terminals

AC Voltage at

C-C Terminals

Check

Action

Vac.

— System power off.

— Restore power.

— Replace wiring.

— Free or replace limit switch.

— Replace transformer.

—

Short in clock power supply wiring.

Limit switch contacts stuck open.

Transformer supplying power is

burned out.

Up to 15 Vac.

— System transformer used to power

the clock is inadequate.

— Use additional (separate)

transformer.

—

Additional (separate) transformer

used to power the clock has

inadequate voltage.

— Install transformer with proper

secondary voltage.

15 to 30 Vac.

— Spring fingers on thermostat not

making proper contact with subbase

terminals.

— Rebend spring fingers to a

45 degree angle to assure

proper contact.

—

Clock has failed.

— Replace thermostat.

Servicing the Thermostat

Cycle Rate Adjustment

(

T8095A only)

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.

ANTICIPATOR

SCALEPLATE

ANTICIPATOR

SETTING LEVER

M7317

NOTE: Most hot water systems require a setting

of 1.2A.

Fig. 6—Heat Anticipator Setting.

69-0639—1

. Replace the thermostat cover and put the

Thermometer Adjustment

system into operation.

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, use the following procedure:

THERMOMETER

SLOT

BACKSIDE OF

FLIP-UP COVER

1. Remove thermostat cover and open the

flip-up cover.

. Set the thermostat cover on a table near a

INSERT AND TURN

SCREWDRIVER

thermometer of known accuracy.

3. 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 the

cover and put the system into operation.

. If the readings are different, insert a small

M1810

screwdriver in the thermometer slot, see Fig. 7,

and turn it until both thermometers read the

same.

Fig. 7—Thermometer Adjustment.

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, 7:30 a.m.

to 4:00 p.m., Central time. Before you call, please have the following information available: make and

model of furnace, old thermostat, and air conditioner.

69-0639—1

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:

(ii)

Honeywell Inc.

in Canada

Returned Goods Department

Honeywell Limited/Honeywell Limitee

740 Ellesmere Road

1050 Berkshire Lane

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.

69-0639—1