Aprilaire 8553 Thermostat User Manual

10-790B 7/11/01 3:11 PM Page 1

ELECTRONIC THERMOSTAT

Owner ’s Manual

MODEL 8553

Day Programmable Thermostat

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OWNER’S MANUAL – TABLE OF CONTENTS

ENERGY STAR Program Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Setting Or Changing The Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Setting Or Changing The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Progressive Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Program Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Setting Or Changing Program Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting Or Changing Program Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

•

Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Reviewing Programmed Time Schedules And Temperature Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

To Start Running The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

For Best Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Thermostat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

•

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Time Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Equipment Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Optional Settings For Additional Thermostat Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Research Products Corporation 2001

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ENERGY STAR Program Information

About half of all energy used by households goes to heating and cooling the

home. By selecting a programmable Aprilaire Electronic Thermostat, you

have made a significant step toward conserving energy usage and costs,

while improving your indoor comfort.

In fact, the Aprilaire Electronic Thermostat Model 8553 has earned the ENERGY STAR designation of the

U.S. Environmental Protection Agency (EPA). This means that your Aprilaire Thermostat is a highly

efficient, cutting edge product that is good for the environment. It saves energy and costs less to

operate than similar products that do not qualify for the ENERGY STAR label.

ENERGY STAR products help you differentiate between standard efficiency and high efficiency products.

By using ENERGY STAR products you are helping to prevent air pollution while saving money on your

utility bills.

According to the EPA, taking advantage of the times that a home is unoccupied or the occupants

are asleep, an ENERGY STAR thermostat can reduce heating and cooling bills by as much as 30%. The

Aprilaire Thermostat has programmable capabilities that allow you full flexibility to set your heating

and cooling systems to meet your comfort and energy needs. As an ENERGY STAR partner, Research

Products has determined that this product meets the ENERGY STAR guidelines for energy efficiency.

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As part of the ENERGY STAR program, your thermostat has been programmed with the following times and

temperatures. This has been done to achieve energy efficiency and lower energy bills. If you need to

modify your program schedule, see page 7.

TIME SCHEDULE

THERMOSTAT

SYMBOL

DESIRED

TEMPERATURE

SETTING

EVENT

Mon Tue Wed Thu

Fri

Sat Sun

Morning

Heat = 70˚

Cool = 78˚

6:00 6:00 6:00 6:00 6:00 6:00 6:00

am am am am am am am

Day

Evening

Night

Heat = 62˚

Cool = 85˚

8:00 8:00 8:00 8:00 8:00 8:00 8:00

am am am am am am am

Heat = 70˚

Cool = 78˚

5:00 5:00 5:00 5:00 5:00 5:00 5:00

pm pm pm pm pm pm pm

Heat = 62˚

Cool = 82˚

10:00 10:00 10:00 10:00 10:00 10:00 10:00

pm pm pm pm pm pm pm

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IMPORTANT: READ ALL INSTRUCTIONS THOROUGHLY

Programming your Aprilaire Thermostat is done in three easy steps: setting the clock, setting the event

times, and setting your desired temperatures.

Setting Or Changing The Clock

Step 1: Press the CLOCK button and “Mo”

(or another day of the week) will flash. Use the

DECREASE or INCREASE button to

change the flashing symbol to the current day

of week.

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Step 2: Press the CLOCK button again and “12:” (hours)

and “AM” or “PM” will flash. Use the DECREASE or

INCREASE button to change the flashing symbol

to the current hour making sure the hour has the proper

AM or PM designation.

Step 3: Press the CLOCK button and “:00” (minutes) will

flash. Use the DECREASE

or INCREASE

button

to change the flashing symbol to the current minute.

Step 4: Press the CLOCK button again. The clock is now

set and the current time appears on the display.

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Setting Or Changing The Program

Programming your Aprilaire Electronic Thermostat involves selecting the temperature you want in your

home and selecting the time you want it to be that temperature. Your Aprilaire Thermostat will allow a

maximum of 4 time schedules per day. Each time schedule is known as an “event .” The Morning event

is typically when you wake up and is the first event of the day. The Day event is typically set when you

leave for work. The Evening event is typically set when you come home from work and the Night event

is set when you go to bed. Each event will have 2 temperatures, 1 heating temperature and 1 cooling

temperature. The cooling temperature must be at least 2 degrees higher than the heating temperature.

Your Aprilaire Thermostat allows a different program for each day of the week. Complete the chart on

page 7 with your desired temperatures and time schedules before beginning programming.

Progressive Recovery

Your Aprilaire Thermostat is equipped with a programming feature called “Progressive Recovery.”

This feature assures that your house will economically achieve the desired comfort temperature at

the programmed time when returning from an economy or setback temperature. For example, if you

like a wake-up temperature of 68°F at 6:00 AM from a setback of 65°F it is not necessary to set the

morning program for 5:00 AM. The thermostat will automatically start warming your house in advance

so your comfort temperature is reached on time.The progressive recovery feature must be activated

in order to work.

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To activate the progressive recovery

mode simultaneously press the

PROGRAM and FAN buttons. A small

thermostat icon, “

“, will appear

under the clock. Once in this mode

proceed with programming your

thermostat remembering to use exact

times for each event time change.

NOTE: If not using Progressive Recovery, it will take some time for your heating or cooling system to reach the

desired temperature when returning from a setback. Therefore, it is suggested you set your program time before the

actual time you want your home to reach the desired temperature. For example, if you get up at 7:00 AM and have a

degree setback, set your Morning event at 6:00 AM to be sure the desired temperature is reached by 7:00 AM.

NOTE: This thermostat can be programmed with either 2 events per day (day and night) or 4 events per day (morning,

day, evening, and night). Before programming the thermostat, decide which setting is best for your personal schedule.

The thermostat is factory preset for 4 events per day. To change to two events per day, refer to page 20 “Optional

Settings for Additional Thermostat Features ,” or contact your contractor for assistance.

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PROGRAM SCHEDULE

TIME SCHEDULE

THERMOSTAT

SYMBOL

DESIRED

TEMPERATURE

SETTING

EVENT

Mon Tue Wed Thu Fri

Sat Sun

Morning

Heat =

Cool =

Day

Evening

Night

Heat =

Cool =

Heat =

Cool =

Heat =

Cool =

NOTE: While programming you must press a button at least every 2 minutes or the thermostat will revert back to the

operational mode. If this happens, simply repeatedly press or press and hold the PROGRAM button until you get back

to where you left off. The information you have already entered has been retained.

NOTE: If consecutive events have the same temperature, you can skip an event by simultaneously pressing the

PROGRAM and MODE buttons. Press and release the PROGRAM button to advance to the next event.

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Setting Or Changing

Program Times

Step 1: Press and release the PROGRAM button.

“

Mo” or the current day of the week will flash and the

Morning “ “ event symbol will appear on the

display. Press the DECREASE button or INCREASE

button to access the day of the week you wish to

start programming or to change the existing program.

Step 2: Press and release the PROGRAM button.

The hours and “AM” or “PM” will flash. Press the

DECREASE

button or INCREASE

button to

“

set the start time hours for the Morning “

event for Monday (or any other day as set in step 1).

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Step 3: Press and release the PROGRAM button.

The minutes will flash on the display. Press the

DECREASE button or INCREASE button to

set the select time minutes for the Morning “

“

event (program times are set in ten-minute increments).

Step 4: Press and release the program button. The Day

“

” event symbol, flashing hours, and “AM” or “PM”

will appear on the display. Repeat steps 2 and 3 for the

Day “ ”, Evening “ ”, and Night “ ”.

Step 5: Press and release the PROGRAM button. The word “Copy” and the day just programmed will

appear on the display. If your schedule is the same for consecutive days, press the DECREASE

button or INCREASE

button to add days to the display. This prevents from having to program the

same times over and over again or continue on to step 6 to program the next day.

Step 6: Press and release the PROGRAM button to continue to the next day to be programmed.

Repeat steps 2-5 for each day.

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Setting Or Changing

Heating Temperatures

Step 1: Press and release the MODE button until the

word “Heat” and the Morning “

” event symbol

appear on the display.

Step 2: To set all program temperatures, press and

release the SET TEMP button. The Morning “

event symbol and flashing temperature will appear on

the display.

”

Step 3: Press the DECREASE

INCREASE button to set the desired Morning

“ event temperature.

button or

“

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Step 4: Repeat steps 2 and 3 for the Day “

”, Evening “

”, and Night “ ” events.

NOTE: If thermostat is set for 2 events per day, only the Day “

” and Night “ ” events can be programmed.

Setting Or Changing Cooling Temperatures

NOTE: Cooling temperatures must be set at least 2 degrees

higher than heating temperatures. (Example: If heating

temperature is set at 70˚F, cooling temperature must be set to at

least 72˚F or higher.) If not set at least 2 degrees higher, the

thermostat will automatically lower the previously programmed

heating temperature to maintain the 2 degree separation.

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Step 1: Press and release the MODE button until the word

“COOL” and the “

” cooling symbol appear on display.

Step 2: To set all program temperatures, press and release

the SET TEMP button. The Morning “ ” event symbol

and flashing temperature will appear on the display.

Step 3: Press the DECREASE

button or INCREASE

button to set the desired morning event temperature.

Step 4: Repeat steps 2 and 3 for the Day “

Evening “ ”, and Night “ ” events.

”,

NOTE: If thermostat is set for 2 events per day, only the

Day “ ” and Night “ ” events can be programmed.

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Reviewing Programmed Time Schedules

And Temperature Settings

Step 1: Press and release the MODE button repeatedly to advance to the desired mode

(heating or cooling).

Step 2: Press and release the PROGRAM button to begin review. Continue pressing the PROGRAM

button to review the time schedules and temperature settings for each desired event. To review a

specific day use the DECREASE

button or INCREASE

button to access the day without

having to view previous programmed days.

To Start Running The Program

After all temperatures and start times have been programmed, press and release the RESUME button

to start running programs. If no button is pressed thermostat will resume automatically in approximately

15 seconds.

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For Best Performance

The Aprilaire Model 8553 thermostat is designed for accurate temperature control and easy

operation. The following guidelines should be followed to ensure proper operation of the thermostat:

1. When the thermostat is operating, close the cover to allow for proper air circulation over the

temperature sensor.

2. Do not place anything which can give off warm or cool air, such as candles or portable

humidifiers, near the thermostat.

. Although the thermostat is internally equipped to prevent short cycling of the furnace and air

conditioner, it is possible to inadvertently override this protection. Do not start, stop, and restart

the equipment without allowing a minimum of 2 minutes between heating or cooling cycles.

Thermostat Operation

The Model 8553 is a full-featured thermostat which allows for additional control and operations after

basic time and temperature programming is completed. In addition to the programming buttons used to

set up all event times and temperatures, additional buttons control the following functions:

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Aprilaire Model 8553

Day Programmable Thermostat

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TEMPERATURE CONTROL

•

Reading the Actual Room Temperature: The Model 8553 normally displays the room temperature,

not the set-point temperature.

•

Check the Set-Point Temperature: Press and release the DECREASE

button. The thermostat will display the programmed set-point temperature and a thermometer for

seconds before automatically returning to the actual room temperature display.

button or INCREASE

•

Temporarily Override the Set Temperature: Press and hold the DECREASE

button or

INCREASE button to change the room set-point temperature in 1 degree increments.

The new set-point temperature will be held for 3 hours, then the thermostat will automatically

return to the program.

Hold a New Temperature Set Point: Press and hold the DECREASE

button or INCREASE

button to change the room set-point temperature in 1 degree steps. The new set-point temperature

can be maintained indefinitely by pressing and releasing the HOLD button. The word “HOLD” will

be displayed. The thermostat will maintain this new set-point temperature until the RESUME button

is pressed returning the thermostat to the original program. This procedure is typically used during

extended vacant periods (vacations, business trips, etc.), to hold an economical set point until

you return.

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•

Returning to Programmed Operation: At any time, press the RESUME button to return the

thermostat to operate as programmed.

Change Between °C and °F : The thermostat has the capability of displaying either Celsius or

Fahrenheit temperatures. If the displayed temperature seems abnormally high or low

(ie: 70˚F = 21˚C) you may need to switch to ˚C or ˚F by simultaneously pressing the

DECREASE button and the INCREASE button.

•

Checking the Outdoor Temperature: If your thermostat was installed with the optional

Aprilaire Outdoor Temperature Sensor, simply press the OUTDOOR button and the

thermostat will display the outdoor temperature for 5 seconds before automatically returning

to the actual room temperature display.

TIME CONTROL

•

Change From 12- to 24-Hour Clock: Press and release the CLOCK button, then press the MODE

button. To return to a standard clock, repeat the process.

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EQUIPMENT CONTROL

•

Turning on the Fan: At any time the system fan can run continuously by pressing the FAN button.

Note that a Fan icon, “ “, appears in the lower part of the display indicating that the fan is

continuously operating. To return the fan to the normal operating mode, press the FAN button again

which will remove the icon from the display. In the normal operating mode the fan will only run when

the furnace/air conditioner is operating. Continuous fan operation is beneficial if your system is

equipped with a high efficiency air cleaner or a humidifier, or to circulate air in the home.

•

Selecting Cooling Mode: Press the MODE button until the word "COOL" appears on the display.

In this mode the air conditioner will maintain temperature according to the programming previously

completed unless an override temperature has been entered. Note that a Snowflake icon, “

“,

is on the display, which flashes when the air conditioner is running.

Selecting Heating Mode: Press the MODE button until the word "HEAT" appears on the display.

In this mode the furnace will maintain temperature according to the programming previously

completed unless an override temperature has been entered. Note that a Flame icon, “ ,“ is on

the display, which flickers when the furnace is running.

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•

Automatic Heating and Cooling: This mode can be useful during times of the year and in climates

when it is cool at night requiring heating but warm in the afternoon requiring cooling. Press and

release the MODE button until the word "AUTO" appears on the display. In this mode the furnace/air

conditioner will maintain temperature according to the programming previously completed unless

an override temperature has been entered. The furnace/air conditioner will operate in either the

heating or cooling mode depending on which programmed set point is closest to the room

temperature. Note that both the Snowflake “

“ and Flame “ “ icons are on the display. The

Snowflake will flash or the Flame will flicker depending on which mode the furnace/air conditioner

is operating in.

•

Turning the System Off: Press the MODE button until the word "OFF" appears on the display. In this

mode the furnace/air conditioner will not operate regardless of the temperature. The thermostat can

still be programmed, the optional outdoor temperature sensor will work and the fan will turn on if

the FAN button is pressed. To avoid frozen water pipes, DO NOT use the OFF mode for long periods

of time during sub-freezing temperatures.

NOTE: After selecting a new mode, the thermostat initiates a delay of up to 4 minutes to protect the heating and

cooling equipment.

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Optional Settings For Additional Thermostat Features

The Model 8553 thermostat is equipped with 5 DIP switches located inside the thermostat on the printed

circuit board. These switches are preset by the factory to typical home heating and cooling system

requirements. The installing contractor also reviewed the settings during installation to be sure the

thermostat will operate properly with your heating and cooling system.

The DIP switches can however be changed to customize the thermostat ’s operation to your particular

needs. This should only be done after consulting with your contractor.

The Model 8553 DIP switches control the following functions:

No. 1 – 4 or 2 Events Per Day. The switch is factory preset for 4 events per day; Morning, Day, Evening,

and Night. If it is more convenient you can select a 2-event day, Morning and Night, by moving this

switch to the ON position.

No. 2 – Smart Fan. The thermostat is factory preset with the Smart Fan option off. This allows the system

fan to operate normally with the heating and cooling equipment. If the Smart Fan option is turned on

by placing the DIP switch in the ON position when the Fan button on the thermostat is pushed

(indicated by the fan icon on the display), the system fan will run continuously during the Morning,

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Day, and Evening events. During the Night event, the fan will automatically revert to cycling on

and off with the heating and cooling equipment.

No. 3 – 4 Minute / 2 Minute Minimum Equipment On/Off Times. This switch is factory preset at

minutes. This switch provides short cycle protection for the furnace/air conditioner. If you feel

that the furnace/air conditioner turns on and off too many times per hour, ask your contractor

about changing the switch to a 4 minute minimum on time. Keep in mind, however, that this may

increase the overall temperature variation in the house due to longer run and off times. Do not

change the position of the switch without first consulting with your contractor.

No. 4 – Keypad Lock. If tampering with the thermostat is expected and unwanted, the keypad can be

locked by moving this switch from the factory-preset OFF position to ON. This should not be done

until all programming is finalized. In the locked position only the following functions can be done:

•

The outdoor temperature button will display the outdoor temperature.

The DECREASE button or INCREASE button will temporarily change the set point

a maximum of ±6°F (±3°C) for a period of 3 hours, before the thermostat

automatically returns to the original program.

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If the thermostat does not respond when a button is pushed it may be because the keypad has been

locked. A Lock icon “

“ will appear when a button other than OUTDOOR is pushed if the keypad

has been locked.

No. 5 – Fan with Heat Call. This switch was set by the installing contractor to operate the thermostat

properly with your equipment. Do not change the position of this switch without consulting with the

installing contractor.

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To change the DIP switch settings, the thermostat must be

removed from the base which is attached to the wall.

The power to the thermostat must be turned off

before disassembling or the thermostat can be

permanently damaged. If you do not know

where the switch is that

controls the power to your

thermostat, do not attempt to

access the DIP switches. The

following procedure must be

Figure 1

carefully followed:

a) Turn off power to

the thermostat.

b) Completely open the

thermostat cover.

The cover will snap

into this position.

CAUTION: TO PREVENT DAMAGE, AVOID CONTACT

WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHT-

HAND CORNER OF THERMOSTAT CIRCUIT BOARD.

c) Carefully insert a medium-

sized flathead screwdriver

into the latch access slot

(see Figure 1).

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Figure 2

Figure 3

d) Gently push in and pry up on the handle of the

screwdriver until the lock tab disengages from the

catch tab (you should feel or hear a click –

see Figure 2).

e) After the latch releases, grip the thermostat panel at

the bottom corners and swing it up and away from

the base to completely separate (see Figure 3).

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Once the thermostat panel has been opened and removed from the base, turn the thermostat over

and locate the DIP switches found on the circuit board according to the following drawing:

Be careful to change only the intended DIP switches per

the explanation given at the beginning of this section.

After the DIP switches have

been set to the desired

position, carefully

reassemble the

thermostat.

a) Place the cover

on the base by lining up

the 2 round pegs on the

bottom of the cover with

the half circle cutouts

on the top of the base.

Note that the bottom of the

cover when fully open slides

in behind the top of the base.

Swing the cover fully open.

The cover will stay in place.

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Figure 4

b) Align the hinge tabs on the base and

thermostat panel. Swing the panel to the

base and snap in place at bottom of

thermostat panel (see Figure 4).

c) Turn the thermostat power back on.

CAUTION: TO PREVENT

DAMAGE, AVOID CONTACT WITH BLUE

TEMPERATURE SENSOR ON BOTTOM

RIGHT-HAND CORNER OF THERMOSTAT

CIRCUIT BOARD.

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In Case Of Power Failure

The Model 8553 thermostat does not require a battery. If the power goes out the letters “AC” appear

on the display indicating power is not being supplied to the thermostat. “AC” will remain on the

display for up to approximately 1 hour after the power goes out. During the period that the power is

off, the heating/cooling system will not operate.

This thermostat is equipped with a continuous memory feature which does not require any battery.

The thermostat will never lose what has been programmed regardless of the length of the power

outage. If the thermostat has been set to “Hold” a particular temperature and the power fails, the

thermostat will maintain the hold temperature when the power is restored.

After a period of 1 hour without power the clock will need to be reset. The clock will default to

12:00 AM. Refer to the Programming Instructions to reset the clock.

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Cleaning

If the surface of the thermostat becomes dirty it can be cleaned with plain water or many non-

abrasive household cleaners, such as glass cleaner. When using any cleaner be careful not to get

any into the interior of the thermostat. Do not spray any cleaner directly onto the thermostat. Spray

the cleaner onto a soft cloth and wipe the surface of the thermostat.

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Limited Warranty

Your Research Products Corporation Aprilaire Thermostat unit is expressly warranted for two (2) years from date of

installation to be free from defects in materials and workmanship.

Research Products Corporation ’s exclusive obligation under this warranty shall be to supply, without charge, a

replacement for any thermostat which is found to be defective within a two (2) year period and which is returned, together

with the date of installation, no later than thirty (30) days after said two (2) year period by you to either your original

supplier or to Research Products Corporation, Madison, Wisconsin 53701.

THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL

NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO

DEFECTS IN THE THERMOSTAT ITSELF.

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL

BE LIMITED IN DURATION TO THE AFORESAID TWO YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S

LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES,

RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS

EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS

THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED

WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED

WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.

Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or

consequential damages, so the above exclusion or limitations may not apply to you.

This warranty gives you specific legal rights and you may also have other rights which vary from state

to state.

–

29 –

10-790B 7/11/01 3:11 PM Page 32

The Aprilaire Total Indoor Air Comfort System is an integrated group of air quality enhancement

products designed to work with your heating and cooling system to make your home more comfortable.

For the best in indoor air quality, ask your heating and cooling contractor about these fine

Aprilaire products, or visit us at www.aprilaire.com for your Indoor Air Solutions.

Automatic Humidifier

The Best Cure For Dryness

High Efficiency Air Cleaner

Nobody Makes Clean Air Easier

Fresh Air Exchanger

™

Only The Freshest Homes Have April Air

The world ’s first computer-equipped,

completely automatic humidifier.

The economical, trouble-free, high

efficiency air cleaner for your home. supply of fresh air with energy-recovery.

Your best value for a constant, controlled

Zone Control System

Custom Comfort Throughout Your Home

Electronic Thermostat

Energy Efficiency Never Looked So Good

™

The most reliable way to achieve temperature

control in every area of your home.

Ultra-thin, easy-to-use programmable or digital

controls featuring pinpoint accuracy.

P.O. BOX 1467 • MADISON, WI 53701-1467

™

Products For Better Indoor Air Quality

B2202117 REV. 04/01

110-790B

Carrier 49004DP21 Thermostat User Manual

Honeywell CT41A Thermostat User Manual

Honeywell V8943CN Thermostat User Manual

Honeywell RTH8580WF1007W1 Thermostat User Manual

Honeywell Q674A E Thermostat User Manual

Honeywell T6570 Thermostat User Manual

Bryant T2SNAC01 Thermostat User Manual

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Honeywell TH8321U1006 Thermostat User Manual

Lennox 2P1109 Thermostat User Manual