Honeywell T8112D, T8112A User Manual
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved
Electronic Programmable
Thermostat
Owner’s Manual
69-0862—4
Table of Contents
Programming Your Thermostat ........................................................................ 3
Program Schedule........................................................................................... 5
Set Current Time/Day...................................................................................... 6
Heating Program ............................................................................................. 6
Cooling Program.............................................................................................. 7
Operating Your Thermostat................................................................................ 7
Using Programming Features.......................................................................... 7
Setting Fan Switch........................................................................................... 8
Setting System Switch..................................................................................... 9
Maintaining Your Thermostat............................................................................ 9
Installing Batteries ........................................................................................... 9
Troubleshooting Guide...................................................................................... 12
Limited One-Year Warranty ............................................................................... 17
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Programming Your Thermostat
When batteries are installed, your thermostat
can be programmed in your hand before it is
installed or after it is mounted on the wall. For
instructions on installing or replacing the
batteries, refer to Maintaining Your Thermostat
section.
Refer to the Program Schedule section to
program your time and temperature settings for
various times of the day.
Four time periods are available during
workdays: WAKE, LEAVE, RETURN, and
SLEEP. During weekends, only the WAKE and
SLEEP time periods are available. View these
periods individually on the display when you
press the Set Schedule key.
WAKE is the time the thermostat turns on the
heating/cooling equipment after an energy
saving period. When deciding what time to
set for your WAKE period, include extra lead
time, depending on the outside temperature
and your furnace response time, to give the
furnace a head start to heat the house
before you get up. (This will be a higher temperature during heating season, and a lower
temperature during cooling season.)
LEAVE is the time period you can set for an
energy-saving temperature while you are
away at work or school. (This will be a lower
temperature during heating season, and a
higher temperature during cooling season.)
RETURN is the time the thermostat turns on the
heating/cooling equipment after an energy
saving period. When deciding what time to
set for your RETURN period, include extra
lead time, depending on the outside temper-
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ature and your furnace response time, to
give the furnace a head start to heat the
house before you arrive home.
SLEEP is the time period you can set for an
energy-saving temperature while you are
sleeping. (For more comfortable sleeping,
some people choose not to raise the cool
temperature during the night.)
it. For example, a house that is occupied during
weekdays would only require programs for
WAKE and SLEEP.
When pressing the keys, use the ball of your
finger or a soft pencil eraser.
NOTE: Use of sharp fingernails or pencil
points can damage the keypad.
You will set one schedule for weekdays and
another for weekends because your
requirements will probably be different for each.
Fill in the times and temperatures you desire for
weekdays and weekends. If you decide not to
program the thermostat, it automatically
controls heating at 68°F (20°C) and cooling at
78°F (20°C), 24 hours a day. Also, you do not
need to enter a time and temperature program
for all periods if your schedule does not require
If you make an error at any time during
programming, just press the Run Program key,
and continue again at the last step.
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Program Schedule
Heating Program Schedule
Weekdays Start Time Heating Temperature
a
WAKE
LEAVE
RETURN
a
SLEEP
Weekends
a
WAKE
SLEEP
a
WAKE and RETURN start times should include extra lead time, based on outside temperature and furnace
response time, to give your furnace a head start to heat the house.
b
The temperatures cannot be set higher than 88°F (26°C) or lower than 45°F (7°C).
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b
Cooling Temperature
b
NOTE: If you decide not to program the thermostat, it will automatically control heating at 68°F
(20°C), and cooling at 78°F (26°C), 24 hours a day. This guide can be used for programming your new thermostat.
IMPORTANT
Batteries are required for operation
and programming. When inserting
batteries, set the System switch to Off.
Remove the battery door (on the
thermostat left side) using a coin at the
bottom. See Maintaining Your Thermostat section.
Set Current Time/Day
To set time, press and release Set Clock/Day
key once. Press Time keys until current time
shows.
To set the day, press and release the Set
Clock/Day key again. Press Time keys until
current day shows. Press Run Program key.
Heating Program
With the System switch set to Heat, press and
release the Set Schedule key once. WAKE,
Mon-Fri, and SET appear on the display.
Use Time keys to program WAKE time and
Temp keys to program WAKE temperature for
Mon-Fri. Repeat sequence for LEAVE,
RETURN, and SLEEP.
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