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®

ELECTRONIC THERMOSTAT

Owner’s Manual

MODELS

8533, 8534 & 8538

Digital Heat/Cool Thermostats

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OWNER’S MANUAL – TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Getting Familiar With The Aprilaire ® Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

• Temperature Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

• Mode Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

• Temperature Settings – Day/Night Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

• Fan Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

• Outdoor Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Setting Up The Aprilaire Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operating The Aprilaire Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Changing The Current Temperature Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Optional Feature – Locking The Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

© Research Products Corporation 2001

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IMPORTANT: READ ALL INSTRUCTIONS THOROUGHLY

Introduction

Thank you for your recent Aprilaire ® Electronic Thermostat purchase. We sincerely appreciate your business and are pleased to add your name to our growing list of customers.

With this purchase, you have invested in the highest quality equipment currently available.

Please be assured that in addition to product quality, we are committed to total product performance and complete customer satisfaction.

Now, please take a few minutes to familiarize yourself with your new Aprilaire Thermostat. In order to take advantage of all the benefits of your new thermostat, it is important that you understand how to operate it.

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Aprilaire

Digital Heat/Cool Thermostat

Temperature ˚F or ˚C.

Room temp. normally displayed. Press

Outdoor button to display outdoor temp.

(Model 8041 Remote

Outdoor Sensor required).

Set-point icon displays the active set point

(full sun = Day set point, partial moon

= Night set point).

Press to select

Heat/Cool/Auto/Off.

(Auto for Models 8534

& 8538 only)

Press for continuous fan. Press again to resume to auto fan.

Fan icon displays during continuous fan only.

Figure 1 - Display and Button Description

Mode

Fan

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Outdoor

Heat and Cool Mode icons. Both displayed during Auto Mode.

Flame flickers during heat call and Snowflake flashes during cool call.

Displays mode when changing (Heat, Cool,

Off, and Auto).

(Auto for Models 8534

& 8538 only)

Day/Night

Press to display outdoor temperature

(w/optional Model 8041

Remote Outdoor

Sensor only).

Press to change set point to either the Day or Night preset value.

Press to raise and lower set point. Press both at the same time to switch between ˚F and ˚C. Press and release to view current set point.

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Getting Familiar with the Aprilaire Thermostat

(refer to Figure 1)

The LCD (Liquid Crystal Display) normally shows: the room temperature, the current mode of operation, if the Day or Night temperature setting is being used, and if the system fan is set for continuous operation.

Temperature Display

Room temperature can be displayed in either degrees Fahrenheit or degrees Celsius. If the displayed temperature seems abnormally high or low (example: 70˚F is equal to 21˚C), press the DECREASE button and INCREASE button simultaneously to switch between ˚F and ˚C.

Mode Button

Three modes of operation are available for all the Heat/Cool thermostat models: Heat, Cool, and Off.

Additionally, with the Models 8534 and 8538, “AUtO” mode is available. The mode of operation indicates how you want your heating and cooling equipment to operate. Press the MODE button until the desired mode of operation shows on the display.

Temperature Settings - Day/Night Button

The thermostat stores four temperature settings in its memory, two for heating and two for cooling. The two temperatures for each mode are called the Day setting ” “ (a sun icon appears on the display)

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110-964B 7/12/01 9:14 AM Page 6 and the Night setting “ “ (a moon icon appears on the display). The Day setting is intended to be an occupied or comfort setting and the Night setting is intended to be an unoccupied or energy savings setting. For example the four settings stored in the memory of the thermostat might be as shown in

Table 1. Pressing the DAY/NIGHT button allows you to instantly change to a more economical setting when leaving the house or going to bed, and to a comfort setting when returning home or waking up. This thermostat is equipped

MODE DAY NIGHT with accessory inputs which can be used to automatically switch between day and night set points; contact your installing

Heat

Cool

68˚F

78˚F

60˚F

85˚F contractor for more details.

Table 1 – Typical Set Point Values

Fan Button

The system fan will operate automatically during a heating or cooling cycle. If it is desired to run the fan continuously, press the FAN button, and a Fan “ “ icon will appear on the display.

Outdoor Button

This button will be made functional when the optional Aprilaire Model 8041 Remote Outdoor Sensor has been installed. It can then be used to find out the outdoor temperature from indoors. If the Model 8041

Remote Outdoor Sensor has not been installed, two dashes “– –” will appear on the display when this button is pushed.

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Setting Up The Aprilaire Thermostat

To ensure accurate temperature control, observe the following simple guidelines:

• When the thermostat is operating, close the cover to allow proper air circulation over the temperature sensor.

• Do not place anything which can give off warm or cool air, such as candles or portable humidifiers, near the thermostat.

1. Adjusting the Heat Temperature Settings. There are two settings, the Day setting “ “ (a sun icon appears on the display) and the Night setting “ “

(a partial moon icon appears on the display).

See Figure 2.

a.

Press the MODE button repeatedly until HEA t appears on the display.

b.

Press the DAY/NIGHT button until the “ “ icon

(Day setting) appears on the display.

c.

Use the DECREASE button and INCREASE button to adjust the setting.

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Figure 2 - Adjust Heat Settings

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Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.

e.

Use the DECREASE button and INCREASE button to adjust the setting.

2. Adjusting the Cool Temperature Settings. There are two settings, the Day setting “ “ (a sun icon appears on the display when this setting is being used) and the Night setting “ “ (a partial moon icon appears on the display when this setting is being used). See Figure 3. a.

Press the MODE button repeatedly until COOL appears on the display.

b.

Press the DAY/NIGHT button until the “ “ icon

(Day setting) appears on the display.

c.

Use the DECREASE button and INCREASE button to adjust the setting.

Figure 3 - Adjust Cool Settings d.

Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.

e.

Use the DECREASE button and INCREASE button to adjust the setting.

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Operating The Aprilaire Thermostat

1. Select the mode of operation by repeatedly pressing the MODE button until the desired mode appears on the display. The heating and cooling system may be turned off by selecting the “OFF” mode. Do not set to the “OFF” mode during periods when freezing temperatures may occur.

• COOL: In the “COOL” mode a Snowflake “ “ icon appears on the display, which flashes when the air conditioning is running.

• HEAT: In the “HEAt” mode a Flame “ “ icon appears on the display, which flickers when the furnace is running.

• AUTO (Models 8534 and 8538 only): In the “AUtO” mode, the heating and cooling system will operate in either the “HEAt” or “COOL” mode depending on which current setting the room temperature is closest to. Note that both the Snowflake “ “ and Flame “ “ icons appear on the display.

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2. Select the temperature setting to be used by pressing the DAY/NIGHT button until the desired previously stored temperature setting (Day or Night) appears on the display. Use the

DECREASE button and INCREASE button to change the temperature if desired (NOTE that if changed, the new set point will be permanently stored in memory - see CHANGING THE

CURRENT TEMPERATURE SETTING).

3. After approximately 5 seconds the thermostat will return to the normal display.

Note: This thermostat utilizes time delays to protect the heating and cooling equipment. If the equipment does not shut off or turn on immediately when the temperature setting has been changed, it may be due to the built-in time delays (4 minutes max.).

4. Press the Fan button, if it is desired, to run the fan continuously. A Fan “ “ icon will appear on the display when the fan is set to operate continuously.

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Changing The Current Temperature Setting

1. Press and release either the DECREASE button or INCREASE button to see the current

temperature setting. The setting, a Thermometer icon and a Double Arrowhead icon will appear

(see Figures 2 and 3 on pages 5 and 6).

2. Change the temperature setting:

OPTION 1 – Use the DECREASE button or INCREASE button. Press and hold the

DECREASE button or INCREASE button to change the current temperature setting.

The thermostat remembers the most recent temperature settings. For example, if the Day, Cool temperature shown in Figure 3 were changed from 78˚F to 76˚F, the 76˚F setting would remain in memory as the Day, Cool setting.

Note: The Cool temperature setting must be a minimum of 2˚F higher than the Heat temperature setting for both the Day and Night sets. The thermostat will automatically update the setting not being changed. In the example above, if the Day, Heat setting was 75˚F, the thermostat would have automatically changed the setting to 74˚F when the Cool setting was changed to 76˚F.

OPTION 2 – Use the DAY/NIGHT button. Press the DAY/NIGHT button to instantly change the temperature setting to one of the two settings stored in memory.

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Optional Feature – Locking The Keypad

If tampering with the thermostat is expected and unwanted, the keypad can be locked by changing the position of the Keypad Lock DIP switch (switch no. 2) from the factory set OFF position to ON.

The DIP switches are located inside the thermostat on the circuit board. To access the DIP switches, refer to the Installation Instructions that came with the thermostat, or consult your contractor.

In the locked position, only the following functions can be done:

• The outdoor temperature button will display the outdoor temperature.

• The thermostat will default to the Day setting.

• The DECREASE button and INCREASE button will temporarily change the Day setting a maximum of ±6°F (±3° for Model 8533) for a period of 3 hours before the thermostat automatically returns to the Day setting.

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.

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In Case Of Power Failure

This thermostat does not require a battery. If the power goes out, the display is blank. During the period that the power is off, the heating/cooling system will not operate. When the power is restored, the thermostat will default to the Day setting and the current mode of operation at the time of the power outage.

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

The thermostat will never lose the four programmed temperature settings regardless of the length of the power outage.

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.

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Notes

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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 ™

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