Honeywell T8090T User Manual
Zone Thermostat
Heating/Cooling Thermostat and
Subbase or W allplate
Model T8090T
OWNER’S MANUAL
69-0432-1
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 independent control of each zone provides additional energy savings.
Recycling Notice
This control contains mercury in a sealed tube. Do
M3375
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.
2 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
3 69-0432—1
Features of Your
Thermostat
1
1 FLIP-UP COVER. Lift it up to set clock for
energy savings and normal temperature
periods.
2 THERMOSTAT COVER.
2
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 to match the correct AM or PM
time to the time indicator.
6 TIME INDICATOR. Arrow head indicates
time for 24-hour dial.
7 PROGRAM INDEX WHEEL. Controls high
M8693
3
and low temperature at specific time of
day as set by program pins.
8 TEMPERATURE SETTING LEVERS. Left
(blue mark) controls the low temperature;
right (red mark) controls the high temperature.
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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
set at 0.1A for proper system operation.
14 MERCURY BULB AND BIMETAL
ELEMENT(2). Provide automatic temperature control by switching the heating or
cooling system on and off.
5
4
9
7
10
6
11
8
13
12
14
M8691
5 69-0432—1
15 WALLPLATE
Provides mounting base and wiring connections for control of zones other than
zone 1 in heating or heating-cooling
systems.
16 SUBBASE
Provides mounting base, wiring connections and manual switching for control of
zone 1 in heating or heating-cooling
systems.
15
M2421
W
G
16
Y
R
M8690
6 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.
■ Set the right lever (red mark) to the temp-
erature 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
savings temperature you want when you are
sleeping or the associated zone is unoccu-
pied.
LOW TEMPERATURE
SETTING LEVER
(BLUE MARK)
12
8
7
9
6
0
1
5
4
11
2
3
1
1
9
2
2
3
1
1
3
2
11
4
10
5
6
9
7
8
6
50
607080
50
60 70 80
by Honeywell
HIGH
TEMPERATURE
SETTING
LEVER
(RED MARK)
M641A
Fig. 1—Setting high and low
temperature setting levers.
7 69-0432—1
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.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
M7188
Fig. 2—Inserting clock batteries.
8 69-0432—1
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