110-790B 7/11/01 3:11 PM Page 1

®

ELECTRONIC THERMOSTAT

Owner’s Manual

MODEL 8553

7 Day Programmable Thermostat

110-790B 7/11/01 3:11 PM Page 2

OWNER’S MANUAL – TABLE OF CONTENTS

E

NERGY

S

TAR

® 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

110-790B 7/11/01 3:11 PM Page 3

E

NERGY

S

TAR

®

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 E

NERGY

S

TAR 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 E

NERGY

S

TAR label.

E

NERGY

S

TAR products help you differentiate between standard efficiency and high efficiency products.

By using E

NERGY

S

TAR 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 E

NERGY

S

TAR 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 E

NERGY

S

TAR partner, Research

Products has determined that this product meets the E

NERGY

S

TAR guidelines for energy efficiency.

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As part of the E

NERGY

S

TAR 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.

EVENT

Morning

Day

Evening

Night

TIME SCHEDULE

THERMOSTAT DESIRED

SYMBOL TEMPERATURE Mon

SETTING

Tue Wed Thu Fri Sat Sun

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

8:00 8:00 8:00 8:00 8:00 8:00 8:00 am am am am am am am

Heat = 62˚

Cool = 85˚

Heat = 70˚

Cool = 78˚

Heat = 62˚

Cool = 82˚

5:00 pm

10:00 pm

5:00 pm

5:00 pm

5:00 pm

10:00 10:00 10:00 pm pm pm

5:00 pm

10:00 pm

5:00 pm

5:00 pm

10:00 10:00 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

INCREASE

button to change the flashing symbol or 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 to change the flashing symbol to the current minute.

button

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

6 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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EVENT

Morning

Day

Evening

Night

PROGRAM SCHEDULE

TIME SCHEDULE

THERMOSTAT DESIRED

SYMBOL TEMPERATURE Mon Tue Wed Thu Fri Sat Sun

SETTING

Heat =

Cool =

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 button or

INCREASE button to set the desired Morning

“ “ event temperature.

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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.

3. 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

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

5 seconds before automatically returning to the actual room temperature display.

• 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 “ “ 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

2 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 carefully followed: a) Turn off power to the thermostat.

b) Completely open the thermostat cover.

The cover will snap into this position.

c) Carefully insert a mediumsized flathead screwdriver into the latch access slot

(see Figure 1).

CAUTION:

Figure 1

TO PREVENT DAMAGE, AVOID CONTACT

WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHT-

HAND CORNER OF THERMOSTAT CIRCUIT BOARD.

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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

– 26 – 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.

110-790B 7/11/01 3:11 PM Page 29

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 nonabrasive 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.

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110-790B 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 ®

The world’s first computer-equipped, completely automatic humidifier.

High Efficiency Air Cleaner

Nobody Makes Clean Air Easier ®

The economical, trouble-free, high efficiency air cleaner for your home.

Zone Control System

Custom Comfort Throughout Your Home

®

The most reliable way to achieve temperature control in every area of your home.

Fresh Air Exchanger

Only The Freshest Homes Have April Air ™

Your best value for a constant, controlled supply of fresh air with energy-recovery.

Electronic Thermostat

Energy Efficiency Never Looked So Good

™

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