Honeywell T8112C User manual

® U.S. Registered Trademark

Electronic Programmable

Thermostat

Owner’s Manual

2 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

3 69-0862—4

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 tem-

perature 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-

4 69-0862—4

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.

5 69-0862—4

Program Schedule

Heating Program Schedule

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).

Weekdays Start Time Heating TemperaturebCooling Temperatureb

WAKE a

LEAVE

RETURNa

SLEEP

Weekends

WAKE a

SLEEP

6 69-0862—4

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 program-

ming 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 Ther-

mostat 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.

7 69-0862—4

Press Set Schedule key until WAKE, SA SU

and SET appear on the display. Use Time keys

to program WAKE time and Temp keys to

program WAKE temperature for Sat-Sun.

Repeat the sequence for SLEEP.

Cooling Program

WIth System switch at Cool, follow the same

instructions as for the Heating Program.

After programming, adjust the Fan and System

switches, as desired. Press and release Run

Program key to start the program.

Operating Your Thermostat

Using Programming Features

Temporarily Change temperature for current

period only—

Press Temp keys to set desired

temperature. The change cancels itself at

the next scheduled program change; to

cancel sooner, press Run Program key.

M8473

Auto On

Fan Cool Off Heat

System

USE TO

SET CURRENT

DAY AND TIME

USE TO SET

PROGRAM PERIOD

USE TO SET

TIME LATER

USE TO

SET COOLER

TEMPERATURE

USE TO SET

WARMER TEMPERATURE

LCD DISPLAY

USE TO SET

TIME EARLIER RUN

PROGRAM

KEY

HOLD

TEMP

KEY

8 69-0862—4

Hold a temperature indefinitely—Press

Hold Temp key once. Press Temp keys

until display shows desired temperature.

Press Run Program key once to return to

the program.

Check Current Temperature Setting—Press

Run Program key once. If using Temporary

Change or Hold features, pressing this key

cancels your change.

Check Programs—Press Set Schedule key

repeatedly to see each time and tempera-

ture. Press Run Program key once to return

to the program.

Cancel a program—Press Set Schedule key

until the program to cancel shows. Pressing

the two Time keys together cancels the

program.

Permanently Change a program—Repeat the

steps in the Heating Program or Cooling

Program sections, as applicable.

Return to the normal program or the starting

program—Press Run Program key once.

Setting Fan Switch

Fan switching positions are:

Auto: Normal setting for most homes. A single-

speed fan turns on automatically with the air

conditioner or furnace. A two-speed fan

usually runs on high with the air conditioner

and runs on low with the furnace.

On: Fan runs continuously. Use for improved

air circulation during special occasions or for

more efficient electronic air cleaning.

9 69-0862—4

Setting System Switch

System switching positions control thermostat

operation:

Cool: Thermostat controls air conditioning

system.

Off: Both heating and air conditioning systems

are off.

Heat: Thermostat controls heating system.

Maintaining Your Thermostat

Installing Batteries

IMPORTANT

Batteries must be installed for pro-

gramming and operation of the ther-

mostat and heating/cooling system.

1. Purchase two AA alkaline batteries; non-

alkaline batteries do not last as long and

can leak, causing damage to the thermo-

stat or wall surface.

2. Make sure the thermostat is set in the Off

position.

3. Use a coin to remove the battery door.

4. Install the fresh batteries, making sure

the positive and negative terminals are

oriented correctly.

M5783

Auto On

Fan Cool Off Heat

System

FAN SWITCH SYSTEM

SWITCH

10 69-0862—4

5. Replace the battery door.

As batteries are running low, bATLo indicator

flashes for one to two months before batteries

run out completely. Replace batteries as soon

as possible after indicator starts flashing.

After batteries are completely dead, bAtLo

indicator disappears, leaving the display

completely blank and the heating and/or cooling

system not operating.

M5781

INSTALL TWO AA ALKALINE

BATTERIES AS SHOWN

M5782

Auto On

Fan Cool Off Heat

System

FAN SWITCH SYSTEM

SWITCH

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