Honeywell T8112D, T8112A User Manual

Electronic Programmable

Thermostat

Owner’s Manual

® U.S. Registered Trademark

© 2004 Honeywell International Inc.

All Rights Reserved

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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.)

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

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.

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 Temperatureb	Cooling Temperatureb
WAKE a
LEAVE
RETURNa
SLEEP
Weekends
WAKE a
SLEEP

aWAKE 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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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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