Honeywell T8090T Thermostat User Manual

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Zone Thermostat  
Heating/CoolingThermostat and  
Subbase or Wallplate  
Model T8090T  
OWNER’SMANUAL  
6
9-0432-1  
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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  
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.  
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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  
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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  
2
3
1
2
4
5
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.  
6
7
M8693  
3
8
TEMPERATURE SETTING LEVERS. Left  
(
blue mark) controls the low temperature;  
right (red mark) controls the high tempera-  
ture.  
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9
PROGRAM PINS. Must be inserted into  
4-hour clock dial slots to control program  
5
4
10  
8
14  
2
index wheel.  
PIN SLOTS. Located on 24-hour dial at  
10  
10-minute intervals for program pin  
insertion.  
1
1
1
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.  
2
1
3
4
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.  
9
7
6
11  
12  
13  
M8691  
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1
5
6
WALLPLATE  
Provides mounting base and wiring con-  
nections for control of zones other than  
zone 1 in heating or heating-cooling  
systems.  
1
SUBBASE  
Provides mounting base, wiring connec-  
tions and manual switching for control of  
zone 1 in heating or heating-cooling  
systems.  
15  
M2421  
W
G
Y
R
16  
M8690  
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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.  
50  
60 70  
80  
12  
NOTE: You may override the time program by  
setting both the red and blue levers to the  
same temperature setpoint.  
50  
60 70 80  
by Honeywell  
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3
For Cooling:  
6
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.  
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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.  
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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.  
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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.  
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2
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.  
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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.  
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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  
°
F
°C  
14  
CONTROL  
°F  
°C  
CONTROL  
BEGINS  
0:00 PM  
58  
BLUE  
80  
27  
RED  
BLUE  
RED  
NIGHT  
ENERGY  
1
SAVING ENDS  
PERIOD 6:00 AM  
6
8
20  
14  
20  
RED  
BLUE  
RED  
75  
80  
75  
24  
27  
24  
You can set both a day and a night  
program. See Fig. 5 for program  
examples.  
DAY  
BEGINS  
58  
ENERGY 7:30 AM  
SAVING  
PERIOD  
ENDS  
68  
BLUE  
M626A  
4:00 PM  
Fig. 5—Programming examples.  
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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.  
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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.  
1
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)  
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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.  
1
air flow at register.  
Damper may be operating improperly.  
Contact a qualified service technician  
for assistance.  
(
continued)  
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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)  
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Troubleshooting (continued)  
PROBLEM  
CHECK  
ACTION  
No cooling.  
2
—system switch. May be in OFF or Move switch to COOL position.  
HEAT position.  
1
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)  
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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.  
1
2
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.  
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Voltage at Clock Terminals  
AC VOLTAGE AT  
C-R TERMINALS  
POSSIBLE CAUSE  
CHECK  
ACTION  
1. Restore power.  
0
Vac  
1. System power is Off.  
2.  
3.  
4.  
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.  
2.  
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.  
2.  
Clock has failed.  
2. Replace the thermostat.  
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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.  
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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.  
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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-  
®
8
28-8367. Before you call, please have the following information available: Make and model of  
your furnace, old thermostat and air conditioner.  
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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  
1
740 Ellesmere Road  
Scarborough, Ontario  
M1P 2V9  
D.F. ©Honeywell Inc. 1995 Printed in Mexico  
Rev. 1-95 Form Number 69-0432—1  

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