Honeywell Trol-A-Temp T8090T User manual

69-0432-1
ZoneThermostat
Heating/CoolingThermostat and
Subbase orWallplate
ModelT8090T
OWNER’SMANUAL

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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.
M3375

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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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Features ofYour
Thermostat 1FLIP-UP COVER. Lift it up to set clock for
energy savings and normal temperature
periods.
2THERMOSTAT COVER.
3THERMOMETER. Provides accurate room
temperature reading.
4CLOCK. This clock provides a 24-hour
slotted dial to hold the programming pins.
5CLOCK HANDS. Turn minute hand clock-
wise to match the correct AM or PM
time to the time indicator.
6TIME INDICATOR. Arrow head indicates
time for 24-hour dial.
7PROGRAM INDEX WHEEL. Controls high
and low temperature at specific time of
day as set by program pins.
8TEMPERATURE SETTING LEVERS. Left
(blue mark) controls the low temperature;
right (red mark) controls the high tempera-
ture.
2
1
3
M8693

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9PROGRAM 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 tempera-
ture control by switching the heating or
cooling system on and off.
58
97611 12 13
10 14
M8691
4

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15 WALLPLATE
Provides mounting base and wiring con-
nections for control of zones other than
zone 1 in heating or heating-cooling
systems.
16 SUBBASE
Provides mounting base, wiring connec-
tions and manual switching for control of
zone 1 in heating or heating-cooling
systems.
M2421
15
M8690
W
Y
R
G
16

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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.
■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.
Fig. 1—Setting high and low
temperature setting levers.
8
9
10
12
11
1
2
3
4
5
6
7
8
9
10
12
11
1
2
3
4
5
6
7
50 60 70 80
12
6
3
9
50 60 70 80
by Honeywell
HIGH
TEMPERATURE
SETTING
LEVER
(RED MARK)
LOW TEMPERATURE
SETTING LEVER
(BLUE MARK)
M641A

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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.

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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-
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
(dark) band of the program dial.
EXAMPLE: For 11 PM, the time indicator arrow
will point directly to the darkband. For 11 AM,
the arrow will point to them light band on the
dial.
TIME
INDICATOR
ARROW
MINUTE
HAND
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.