Heating or Cooling Thermostat
and Wallplate or
Heating/Cooling Thermostat and
Subbase
T8090A/191108A, Q682B
OWNER’S MANUAL
1 69-0574—2
69-0574-2
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
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 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.
69-0574—2 2
TABLE OF CONTENTS
Features Of Your Thermostat ........................................................................................................... 4
Setting The Temperature .................................................................................................................. 7
Inserting Clock Batteries ................................................................................................................... 8
Setting The Clock .............................................................................................................................. 9
Programming................................................................................................................................... 10
Troubleshooting .............................................................................................................................. 14
Servicing The Thermostat ............................................................................................................... 23
Cycle Rate Adjustment.................................................................................................................... 23
Thermometer Adjustment................................................................................................................ 24
Warranty.......................................................................................................................................... 27
3 69-0574—2
Features Of Your Thermostat
1 FLIP-UP COVER. Lift it up to set clock for
energy savings and normal temperature
periods.
2 THERMOSTAT COVER. Lift up and
remove to adjust heat anticipator.
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 clock-
wise
time to the time indicator.
6 TIME INDICATOR. Arrow head indicates
time for 24-hour dial.
7 PROGRAM INDEX WHEEL. Controls high
and low temperature at specific time of day
as set by program pins.
69-0574—2 4
to match the correct AM or PM
8 TEMPERATURE SETTING LEVERS. Left
(blue mark) controls the low temperature,
right (red mark) controls the high
temperature.
1
3
2
M8726
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
adjusted to match the heating system
primary control current.
14 MERCURY BULB AND BIMETAL
ELEMENT (2). Provide automatic temperature control by switching the heating or
cooling system on or off.
5
4
9
7
10
6
11
8
13
12
14
M8691
5 69-0574—2
15 191108AJ WALLPLATE. Provides mount-
ing base and wiring connections for
heating-only or cooling-only thermostat.
16 Q682B SUBBASE. Provides mounting
base, wiring connections and manual
switching control for heating/cooling
thermostat.
69-0574—2 6
15
16
FAN
O
B
R
W
G
Y
AUTO OFF
HEATON
M2421
COOL
M719
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.
LOW TEMPERATURE
SETTING LEVER
(BLUE MARK)
12
8
7
9
6
10
5
4
11
3
12
1
9
2
3
2
1
12
11
4
10
5
6
9
7
8
6
607080
50
50
3
60 70 80
HIGH
TEMPERATURE
SETTING
LEVER
(RED MARK)
M1520
Fig. 1—Setting high and low
temperature levers.
7 69-0574—2
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
69-0574—2 8
®
batteries.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
Fig. 2—Inserting clock batteries.
M7188
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 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.
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.
MINUTE
HAND
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
INDICATOR
ARROW
M8561
Fig. 3—Setting the clock.
9 69-0574—2
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
69-0574—2 10
up to six temperature changes with the pins
supplied. We recommend at least five hours
for each energy saving period.
24-HOUR PROGRAM DIAL
(GRAY AREA FOR
NIGHT SETTINGS)
FLIP-UP
COVER
PROGRAM
PINS
THERMOSTAT
COVER
PROGRAM PIN SLOT
PROGRAM INDEX WHEEL
MANUAL PROGRAM
ADVANCE BUTTON
PROGRAM PIN
STORAGE
TIME INDICATOR
ARROW
M8692
Fig. 4—Program components.
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
the furnace time to heat the house before you
wake up or arrive home.
red
pin. The half-hour head start gives
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 furnace will be off until room temperature drops to the energy savings set point.
WINTER SUMMER
NIGHT
ENERGY
SAVING
PERIOD
DAY
ENERGY
SAVING
PERIOD
BEGINS
10:00 PM
ENDS
6:00 AM
BEGINS
7:30 AM
ENDS
4:00 PM
TEMPERATURE
°F
°C
58
14
68
20
58
14
68
20
PROGRAM
PIN IN
CONTROL
BLUE
RED
BLUE
RED
TEMPERATURE
°F
80
75
80
75
°C
27
24
27
24
PROGRAM
PIN IN
CONTROL
RED
BLUE
RED
BLUE
M1690B
Fig. 5—Programming examples.
• You can set both a day and a night pro-
gram. See Fig. 5 for program examples.
11 69-0574—2
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
the air conditioner time to cool the house
before you wake up or arrive home.
69-0574—2 12
blue
pin. The half-hour head start gives
Decide when you want the energy savings
period to start and insert a
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.
red
pin at the notch
Start Or End Programs With Manual Program
Advance Button
IMPORTANT:
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.
To prevent damage to the program
13 69-0574—2
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
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
—R and W thermostat connections. Turn Off power to furnace. Check for correct
69-0574—2 14
COOL position.
— fuse or circuit breaker. If blown or tripped, replace fuse or reset
— furnace power switch. May be Off. Move switch to ON.
— pilot flame. May be out. Relight pilot flame per furnace manufacturers
— other problem. Contact a qualified service technician for
1
Move system switch to HEAT position.
breaker.
instructions.
terminal hookups. Repair any frayed or
broken wires. Firmly tighten all terminal
screws. Turn On power.
assistance.
(continued)
Troubleshooting
(continued)
Problem Check Action
Energy savings
temperature program
— program dial for proper day or
night phase.
Turn timer ahead 12 hours. Move setting
knob clockwise only.
12 hours off.
Rooms do not warm
up at programmed
time.
2
Temperature change
occurs at the wrong
— timer program for heating system.
May need more time to warm up
rooms.
— programs pins for correct time
locations.
Move red pin one-half hour earlier on the
program dial.
Relocate pins to desired settings.
time.
Room temperatures
are not correct.
— positions of thermostat setpoint
levers.
— position of subbase system
Reset to desired temperatures.
Move to desired operating position.
switch.
15 69-0574—2
(continued)
Troubleshooting
Problem Check Action
Room temperatures
are not correct
(continued).
69-0574—2 16
(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.
(continued)
Troubleshooting
Problem Check Action
Room Temperatures
are not correct
(continued).
Burner-on time too
short.
Burner-on time too
long.
No cooling. 1
(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.
— anticipator setting. (See figure on
page 23 for anticipator location.)
— anticipator setting. (See figure on
page 23 for anticipator location.)
— system switch. May be in OFF or
HEAT position.
— fuse or circuit breaker. If fuse is blown or breaker tripped, replace or
17 69-0574—2
Increase anticipator setting by 0.05.
Observe burner operation.
Decrease anticipator setting by 0.05.
Observe burner operation.
Move switch to COOL position.
reset.
(continued)
Troubleshooting
Problem Check Action
No cooling 1
(continued)
Thermostat setting
and thermometer
reading disagree.
69-0574—2 18
(continued)
— condenser switch position.
Located outdoors and may be
turned OFF.
— thermostat connections. Check
for correct terminal hookups.
Repair any frayed or broken wires.
Firmly tighten all terminal screws.
— other. Contact a qualified service technician for
— level position of thermostat. Reinstall thermostat wallplate or subbase.
— area around thermostat for drafts
or radiant heat.
Move to ON position.
Turn OFF power to cooling system.
assistance.
Use a spirit level.
Thermostat should be about 5 ft (1.5m)
above floor on an inside wall. Contact
qualified service technician for change of
location.
(continued)
Troubleshooting
Problem Check Action
Thermostat setting
and thermometer
reading disagree
(continued).
Clock does not run. — thermostat connections at
(continued)
— calibration of thermometer. See instructions on page 24.
the two C terminals. If no
connections, clock needs
batteries in order to run.
Batteries may not have been
installed.
Batteries may need replacement
— if new batteries are installed and
clock still does not run.
— voltage across the two C
terminals.
3
19 69-0574—2
Install as shown on page 8.
Replace with two new AAA alkaline batteries
as shown on page 8.
Replace thermostat.
Remove thermostat from the wallplate or
subbase and measure the voltage. Refer to
the table on page 22 for cause and reaction.
(continued)
Troubleshooting
Problem Check Action
Clock does not run
(continued).
Clock loses time. — power. May be interrupted. Make sure power is on. Reset clock.
69-0574—2 20
(continued)
— pins in program dial. If pins are
not completely seated in program
dial, jamming with index wheel
may occur.
— high limit control. If clock powered
through system transformer,
power to clock and equipment
may be off on safety.
— filter. May be clogged. Safety
limit on equipment may cut off
power to system.
Push down on pins to make sure they are
completely seated in program dial.
Wire separate transformer to power clock, or
install backup batteries as shown on page 8.
Replace filter and reset clock.
(continued)
Troubleshooting
Problem Check Action
Clock loses time
(continued).
1 Not applicable on model used in heating-only system.
2 Not applicable on model used in cooling-only system.
3 If clock is not battery powered, clock may still use batteries for backup.
(continued)
— batteries may need replacement. Replace with two new AAA alkaline batteries
as shown on page 8. We recommend
Energizer® batteries.
If this Troubleshooting section has not solved the problem, call your qualified heating service
technician or Honeywell Customer Assistance Center, 1-800-468-1502, Monday-Friday, 7:00 AM to
5:30 PM, Central time, for additional assistance.
21 69-0574—2
Voltage At Clock Terminals
AC Voltge at
C-C Terminals
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.
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.
15 to 30 Vac. 1. Spring fingers o thermostat not
making proper contact with
subbase terminals.
2. Clock has failed.
69-0574—2 22
Check Action
1. Restore power.
2. Replace wiring.
3. Free or replace limit switch.
4. Replace transformer.
1. Use additional (separate) transformer.
2. Install transformer with proper secondary
voltage.
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.
ANTICIPATOR
SCALEPLATE
NOTE: Most hot water systems require a
setting of 1.2A.
ANTICIPATOR
SETTING LEVER
M7317
Fig. 6—Heat anticipator setting.
23 69-0574—2
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.
69-0574—2 24
THERMOMETER
SLOT
BACKSIDE OF
FLIP-UP COVER
Fig. 7—Thermometer adjustment.
INSERT AND TURN
SCREWDRIVER
M1810
25 69-0574—2
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.
69-0574—2 26
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,
(i) return it, with a bill of sale or other dated proof of purchase, to the dealer or contractor from which you purchased it, or
(ii) 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.
27 69-0574—2
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9
D.F. ©Honeywell Inc. 1995 Rev. 1-95 Form Number 69-0574—2
69-0574—2 28
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