T8190A/191108AJ, Q682
Heating or Cooling
Thermostat and Wallplate
or Heating/Cooling
Thermostat and Subbase
D.F. Rev. 9-94 ©Honeywell Inc. 1994 Form Number 69-0643—1
M3375
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.
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.
not
M3375
place
Recycling Notice
This control contains mercury in a sealed
tube. Do
of its useful life.
contains mercury in a sealed tube, do
your old control in the trash.
authority for instructions regarding recycling and
the proper disposal of this control, or of an old
control containing mercury in a sealed tube.
2 69-0643—1
not
place control in the trash at the end
If this control is replacing a control that
Contact your local waste management
Table of Contents
Page
Features of Your Thermostat ............................................................................................................ 4
Setting the Temperature .................................................................................................................. 7
Inserting Timer Batteries ................................................................................................................... 8
Setting the Timer ............................................................................................................................... 9
Programming................................................................................................................................... 10
Setting Subbase Switches .............................................................................................................. 13
Troubleshooting .............................................................................................................................. 14
Servicing the Thermostat ................................................................................................................ 22
Cycle Rate Adjustment ............................................................................................................... 22
Thermometer Adjustment ........................................................................................................... 23
Warranty.......................................................................................................................................... 27
3 69-0643—1
Features Of Your
Thermostat
1
1 FLIP-UP COVER. Lift it up to set clock for
energy saving and normal temperature
periods.
2 THERMOSTAT COVER. Lift up and remove
4
2
to adjust heat anticipator.
3 THERMOMETER. Provides accurate room
temperature reading.
4 TEMPERATURE SETTING LEVERS. Left
(blue mark) controls the low temperature,
right (red mark) controls the high temperature.
5 TIMER. This timer provides a 24-hour
slotted dial to hold the programming pins.
6 TIMER SETTING KNOB. Turn clockwise
to match the correct AM or PM time to
the time indicator.
M7349
3
7 TIME INDICATOR. Arrow head (triangle
shape) indicates low (blue) temperature
setting or high (red) temperature setting in
control on program index wheel. Also
indicates time on 24-hour dial.
4 69-0643—1
8 PROGRAM INDEX WHEEL. Controls high
and low temperature at specific time of day
as set by program pins.
9 PROGRAM PINS. Must be inserted into 24-
hour timer dial slots to control program
index wheel.
10 PIN SLOTS. Located on 24-hour dial at 10-
minute intervals for program pin insertion.
11 PROGRAM DIAL. 24-hour dial with light
band to indicate daytime and dark band to
indicator nighttime.
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 ELE-
MENT (2). Provide automatic temperature
control by switching the heating or cooling
system on or off.
10
5
9
6
11
8
12
7
14
13
M7350
5 69-0643—1
15 WALLPLATE (Included with thermostat.)
Provides mounting base and wiring
connections for heating-only or cooling-only
thermostat.
16 SUBBASE (Optional, 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.
15
M2421
O
B
R
W
G
16
FAN
Y
AUTO OFF
HEATON
COOL
M 719
6 69-0643—1
Setting the Temperature
For Heating:
■ Set the left lever (blue mark) to the energy
saving temperature you want when you are
sleeping or your home is unoccupied.
■ Set the right lever (red mark) to the tempera-
ture 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 setpoint.
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
saving temperature you want when you are
sleeping or your home is unoccupied.
LOW TEMPERATURE
SETTING LEVER
50
50
607080
60 70 80
HIGH
TEMPERATURE
SETTING
LEVER
M8586
Fig. 1—Setting high and low temperature
setting levers.
7 69-0643—1
Inserting Timer Batteries
Power is supplied to the timer 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 timer if power is interrupted
when using a 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. Properly dispose of old
batteries.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
M8585
Fig. 2—Inserting timer batteries.
8 69-0643—1
Setting the Timer
■ Lift thermostat flip-up cover and you’ll find the
24-hour program dial, slotted in 10-minute
increments. Adjust the timer to the current
time by carefully turning the knob clockwise
. DO NOT reverse the knob.
■ When time is correctly set, the time indicator
arrow (triangle shape) will point to the correct
time and corresponding daytime (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.
the knob carefully in a clockwise direction 23
hours. Do NOT reverse the knob, or damage to
timer mechanism may occur.
PROGRAM DIAL
PROGRAM
PIN (6)
TIMER
SETTING
KNOB
TIME
INDICATOR
ARROW
Daylight Saving Time
When Daylight Saving Time starts, move the
knob carefully in a clockwise direction one
hour. When Daylight Saving Time ends, move
M 821
TIME INDICATOR ARROW
Fig. 3—Setting the timer.
9 69-0643—1
Programming
You can program your thermostat to automatically lower and raise the temperature one or
more times every 24 hours, depending on the
number of program pins used.
Before setting your program
Notice the slots on the program dial (Fig. 4).
The dial is slotted for the program pins that can
be inserted at 10-minute intervals.
■ Lift thermostat flip-up cover and you will find
the 24-hour program dial. The slots on the
program dial (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 has been preprogrammed. A
red pin is inserted at 6:00 AM for high
24-HOUR PROGRAM DIAL
(GRAY AREA FOR NIGHT SETTINGS)
FLIP-UP
COVER
PROGRAM
PINS
THERMOSTAT
COVER
PROGRAM
PIN SLOT
PROGRAM INDEX WHEEL
TIME INDICATOR ARROW
PROGRAM
PIN STORAGE
M7348
Fig. 4—Program components.
10 69-0643—1
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 recom-
mend 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 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.
• On heating/cooling systems, set the
subbase switches to desired positions. See
Setting Subbase Switches section.
• On heating/cooling systems, you must
reset the pins when the seasons change.
You will also probably want to change the
lever positions.
To set 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
effect. The half-hour
furnace time to heat the house before you
awaken or arrive home.
■ Decide when you want the energy saving
period to start and insert a
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.
■ You can set both a day and a night program.
See Fig. 5 for program examples.
11 69-0643—1
red
pin. The high temperature is in
head start
blue
gives the
pin at the
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
58
68
58
68
°C
14
20
14
20
PROGRAM
PIN IN
CONTROL
BLUE
RED
BLUE
RED
Fig. 5—Programming examples.
TEMPERATURE
°C
°F
27
80
24
75
27
80
24
75
PROGRAM
PIN IN
CONTROL
RED
BLUE
RED
BLUE
M1690B
To set 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
effect. The half-hour
conditioner time to cool the house before you
awaken or arrive home.
■ Decide when you want the energy saving
period to start and insert a
notch that corresponds to this time. After the
red pin engages, the high temperature is in
effect. The air conditioner will be off until the
room temperature rises to the energy saving
setpoint.
12 69-0643—1
blue
pin. The low temperature is in
head start
gives the air
red
pin at the
Setting Subbase Switches (if applicable)
The subbase system switch controls system
operation as follows:
HEAT—Heating system is controlled by the
thermostat. Cooling system is off.
COOL—Cooling system is controlled by the
thermostat. Heating system is off.
OFF—Both the heating and cooling systems are
off. If the fan switch is at the AUTO position,
the fan is also off.
ON—In cooling-only applications, only cooling
will operate. In heating-only applications, only
heating will operate.
The subbase fan switch controls fan opera-
tion as follows:
ON—Fan operates continuously.
AUTO—Fan operates with cooling equipment as
controlled by the thermostat or with the
heating equipment as controlled by the
plenum fan switch. In electric heat, heat
pump and fan coil systems, the fan is
controlled by the thermostat in heating and
cooling.
To switch positions, use thumb or index
finger to slide the lever to the desired position.
For proper circuit operation, switch lever must
stop in detent over desired function indicator
mark.
13 69-0643—1
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 Move system switch to HEAT position.
2
or COOL position.
—Fuse or circuit breaker. If blown or tripped, replace fuse or
reset breaker.
—Furnace power switch may be Move switch to ON .
OFF.
—Pilot flame may be out. Relight pilot flame according to furnace
manufacturer 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.
—Other. Contact a qualified service technician
for assistance.
(continued)
14 69-0643—1
Troubleshooting (Continued)
Problem Check Action
Energy saving — Program dial for proper day Turn timer ahead 12 hours. Turn
temperature or night phase. knob clockwise only.
program is
12 hours.
Rooms do not — Timer program for heating Move red pin one-half hour earlier
warm up at the system may need more time on the program dial.
programmed to warm up rooms.
time.
2
Temperature — Program pins for correct time Relocate pins to desired settings.
change occurs locations.
at the wrong time.
Room temperatures — Positions of thermostat set Reset to desired temperatures.
are not correct. point levers.
— Position of subbase system Move to desired operating position.
switch (heating-cooling model).
15 69-0643—1
(continued)
Troubleshooting (Continued)
Problem Check Action
Room —Thermostat circuits. Heating mode—Move temperature
temperatures setting levers 5° F [3° C] above room
are not correct temperature. Heating system should
(continued). start.
Cooling mode—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.
Burner-on time —Anticipator setting. (See Fig. 6 Increase anticipator setting by 0.05
too short. for anticipator location.) (e.g., 0.4 to 0.45). Observe burner
operation.
Burner-on time too — Anticipator setting. (See Fig. 6 Decrease anticipator setting by 0.05
long. for anticipator location.) (e.g., 0.45 to 0.4). Observe burner
operation.
(continued)
16 69-0643—1
Troubleshooting (Continued)
Problem Check Action
No cooling. — System switch may be in OFF Move switch to COOL position.
1
or HEAT position.
—Fuse or circuit breaker. If fuse is blown or breaker tripped,
replace or reset. If fuse blows again,
call the heating and air conditioning
dealer.
—Condenser switch position. Move to ON position.
Located outdoors and may
be turned off.
—Thermostat connections. Turn off power to cooling system.
Check for correct terminal
hookups. Repair any frayed
or broken wires. Firmly
tighten all terminal screws.
—Other. Contact a qualified service technician
for assistance.
17 69-0643—1
(continued)
Troubleshooting (Continued)
Problem Check Action
Thermostat setting — Level position of thermostat. Reinstall thermostat wallplate or
and thermometer subbase. Use a spirit level.
reading disagree. —Area around thermostat for Thermostat should be about 5 ft
drafts or radiant heat. [1.5m] above floor on an inside wall.
Contact qualified service technician for
change of location.
—Calibration of thermometer. See Thermometer Adjustment section.
Timer does not run. —Thermostat connections at the
two C terminals. If no
connections, timer needs
3
batteries in to run.
—Batteries may not have been Install as shown in Fig. 2.
installed.
—Batteries may need Replace with two new AAA alkaline
replacement. batteries as shown in Fig. 2.
—If new batteries are installed Replace thermostat.
and timer still does not run.
18 69-0643—1
(continued)
Troubleshooting (Continued)
Problem Check Action
Timer does not — Voltage across the two C Remove thermostat from the wallplate
run (continued). terminals. or subbase and measure the voltage.
Refer to Voltage at Timer Terminals
table for cause and reaction.
—Pins in program dial. If pins are Push down on pins to make sure they
not completely seated in are completely seated in program dial.
program dial, jamming with
index wheel can occur.
Timer loses time. —Power may be interrupted. Make sure power is on. Reset timer.
—High limit control. If timer Wire separate transformer to power
powered through system timer, or install backup batteries as
transformer, power to timer shown in Fig. 2.
and equipment may be off
on safety.
—Filter may be clogged. Safety Replace filter and reset timer.
limit on equipment can cut off
power to system.
(continued)
19 69-0643—1
Troubleshooting (Continued)
Problem Check Action
Timer loses time —Batteries may need Replace with two new AAA alkaline
(continued). replacement. batteries as shown in Fig. 2.
1 Not applicable on model used in heating-only system.
2 Not applicable on model used in cooling-only system.
3 If timer is not battery powered, timer may still use batteries for backup.
If this Troubleshooting section did not solve
the problem, call a qualified service technician
or the Honeywell Customer Assistance Center,
1-800-468-1502, Monday - Friday, 7:00 AM to
5:30 PM Central time for additional assistance.
20 69-0643—1
Voltage At Timer Terminals
AC Voltages at
C-C Terminals Check Action
0 Vac. — System power off. — Restore power.
— Short in timer power supply wiring. — Replace wiring.
— Limit switch contacts stuck open. — Free or replace limit switch.
— Transformer supplying power is — Replace transformer.
burned out.
Up to 15 Vac. — System transformer used to power — Use additional (separate)
15 to 30 Vac. — Spring fingers on thermostat not — Rebend spring fingers to a 45
the timer is inadequate. transformer.
— Additional (separate) transformer — Install transformer with proper
used to power the timer has secondary voltage.
inadequate voltage.
making proper contact with subbase degree angle to assure proper
terminals. contact.
— Timer has failed. — Replace thermostat.
21 69-0643—1
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.
NOTE: Most hot water systems require a setting
of 1.2A.
ANTICIPATOR
SCALEPLATE
ANTICIPATOR
SETTING LEVER
M7317
Fig. 6—Heat anticipator setting.
22 69-0643—1
Thermometer Adjustment
The thermometer was accurately calibrated at
the factory and should only need adjustment if it
has been dropped or mishandled.
If the setpoint 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 a
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 the 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
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.
THERMOMETER
SLOT
BACKSIDE OF
FLIP-UP COVER
INSERT AND TURN
SCREWDRIVER
M1810
Fig. 7—Thermometer adjustment.
23 69-0643—1
If you have questions regarding the installation and programming of your Honeywell thermostat,
please visit our web site at www.honeywell.com/yourhome or call the 24-hour automated information
line at 1-800-468-1502.
24 69-0643—1
25 69-0643—1
26 69-0643—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,
(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.
27 69-0643—1
Home and Building Control Home and Building Control Helping You Control Your World
Honeywell Inc. Honeywell Limited/Honeywell Limitée
1985 Douglas Drive No. 740 Ellesmere Road
Golden Valley, MN 55422 Scarborough, Ontario
M1P 2V9
Printed in U.S.A. www.honeywell.com/yourhome
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