Aprilaire 8538 Digital Heat Cool Thermostat Owner’s Manual

Aprilaire 8538 Digital Heat Cool Thermostat

Product Information

• Models: 8533, 8534, 8538
• Type: Digital Heat/Cool Thermostat

Introduction
The Electronic Thermostat is a digital heat/cool thermostat designed for controlling the temperature in your home. It features various buttons and icons for easy operation and displays important information such as set points and outdoor temperature (with optional Model 8041 Remote Outdoor Sensor). Please read all instructions thoroughly before using the thermostat.

Display and Button Description
The thermostat has a display that shows different icons and buttons for controlling the settings. Here are the descriptions of the icons and buttons:

• Set-point icon: Displays the active set point (full sun = Day set point, partial moon = Night set point).
• Mode button: Press to select Heat/Cool/Auto/Off. (Auto for Models 8534 & 8538 only)
• Fan button: Press for continuous fan. Press again to resume auto fan.
• Fan icon: Displays during continuous fan only.
• Heat and Cool Mode icons: Both are displayed during Auto Mode. Flame flickers during heat call and Snowflake flashes during cool call.
• Outdoor Day/Night button: Displays mode when changing (Heat, Cool, Off, and Auto). (Auto for Models 8534 & 8538 only)
• Outdoor button: Press to display outdoor temperature (with optional Model 8041 Remote Outdoor Sensor only).

Getting Familiar with the Aprilaire Thermostat
The Aprilaire Thermostat has two main settings: Day and Night. The Day setting is intended for occupied or comfortable settings, while the Night setting is intended for unoccupied or energy-saving settings. You can instantly change to a more economical setting by pressing the DAY/NIGHT button when leaving the house or going to bed, and switch back to a comfort setting when returning home or waking up. The thermostat also has accessory inputs for automatically switching between day and night set points, but you need to contact your installing contractor for more details.

Usage Instructions

Setting Up the Aprilaire Thermostat

1. Press the DAY/NIGHT button until the icon (Day setting) appears on the display.
2. Use the DECREASE button and INCREASE button to adjust the Day setting temperature.
3. Press the DAY/NIGHT button until the icon (Night setting) appears on the display.
4. Use the DECREASE button and INCREASE button to adjust the Night setting temperature.

Adjusting the Cool Temperature Settings
The thermostat has two cool temperature settings: Day and Night.

Follow these steps to adjust the settings:

1. Press the DAY/NIGHT button until the icon (Day setting) appears on the display. A sun icon will be displayed.
2. Use the DECREASE button and INCREASE button to adjust the Day setting temperature.
3. Press the DAY/NIGHT button until the icon (Night setting) appears on the display. A partial moon icon will be displayed.
4. Use the DECREASE button and INCREASE button to adjust the Night setting temperature.

FAQ

Q: How can I display the outdoor temperature?
A: Press the Outdoor button to display the outdoor temperature. Please note that this feature requires the optional Model 8041 Remote Outdoor Sensor to be installed.

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.

Aprilaire
Digital Heat/Cool Thermostat

Getting Familiar with the Aprilaire Thermostat

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 (for 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 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) and the Night setting “ “ (a moon icon appears on the display). The Day setting is intended to be an occupied or comfortable 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 comfortable setting when returning home or waking up. This thermostat is equipped with accessory inputs that can be used to automatically switch between day and night set points; contact your installing contractor for more details.

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.

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 that 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.
   • Press the MODE button repeatedly until HEAt appears on the display.
   • Press the DAY/NIGHT button until the “ “ icon (Day setting) appears on the display.
   • Use the DECREASE button and INCREASE button to adjust the setting.
   • Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.
   • 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.
   • Press the MODE button repeatedly until COOL appears on the display.
   • Press the DAY/NIGHT button until the “ “ icon (Day setting) appears on the display.
   • Use the DECREASE button and INCREASE button to adjust the settings.
   • Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.
   • Use the DECREASE button and INCREASE button to adjust the setting.

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.

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.

Changing The Current Temperature Setting

1. Press and release either the DECREASE button or the 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.

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 to a maximum of ±6°F (±3° for Model 8533) for 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.

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.

Limited Warranty

Your Research Products Corporation Aprilaire® Thermostat unit is expressly warranted for two (2) years from the 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 that is found to be defective within two years 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.

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.

• Fresh Air Exchanger
  Only TheFreshest Homes Have April Air™ Your best value for a constant, controlled supply of fresh air with energy recovery.

• Zone Control System
  Custom Comfort Throughout Your Home® The most reliable way to achieve temperature control in every area of your home.

• Electronic Thermostat
  Energy Efficiency Never Looked So Good™ Ultra-thin, easy-to-use programmable or digital controls featuring pinpoint accuracy.

RESEARCH PRODUCTS CORPORATION
P.O. BOX 1467 • MADISON, WI 53701-1467.

References

• AprilAire Home
• Manual-Hub.com – Free PDF manuals!

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>