• 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. – 7 – 110-7/12/9:14 Page 2. Select the temperature to be used by pressing the DAY/ NIGHT button until the desired previously stored temperature Use the DECREASE button and INCREASE button to change the temperature that if changed, the new set point will CHANGING THE CURRENT TEMPERATURE SETTING). 3. After approximately 5 seconds the thermostat Note: This thermostat utilizes time delays to protect the equipment does not shut off or turn on immediately when changed, it may be due to the built-in time delays (4 minutes 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. – 8 – 110-7/12/9:14 Page Changing The 1. Press and release either button to see the current temperature setting. The setting, a icon will appear (see Figures 2 and 3 on pages 5 and 6). 2. Change the temperature setting: OPTION 1 – Use the DECREASE Press and hold the DECREASE button or INCREASE memory as the Day, Cool setting. Note OPTION 2 – Use the DAY/NIGHT button. – 9 – 110-7/12/9:14 Page Optional Feature If tampering with the thermostat 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 access the DIP switches, refer to the Installation Instructions that In the locked position, only the following functions • The outdoor temperature button will display the • 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 locked. A Lock “ “ icon will appear when a button other than Outdoor is pushed if the keypad has been locked. – 10 – 110-7/12/9:14 Page In Case Of This thermostat does not If the power goes out, the period that the power is off, the the thermostat will default to the Day setting and the current mode of operation power outage. This thermostat is equipped with a continuous The thermostat will never lose the four programmed the power outage. Cleaning If the surface of the thermostat becomes dirty it can be cleaned with 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. a soft cloth and wipe the surface of the thermostat. – 11 – 110-7/12/9:14 Page Limited Warranty Your Research Products Corporation Aprilaire ® Thermostat unit is expressly installation to be free from defects Research Products Corporation’s exclusive obligation under this warranty without charge, a replacement for any thermostat which with the date of installation, no later than supplier or to Research Products Corporation, Madison, Wisconsin 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 LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR 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 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. – 12 – 110-7/12/9:14 Page Notes – 13 – 110-7/12/9:14 Page The Aprilaire ® Total Indoor Air Comfort System is an integrated group of air quality enhancement products designed to work with your heating For the best in indoor air quality, ask your heating and cooling contractor about Aprilaire products, or visit us at for your Indoor Air Solutions. Automatic Humidifier High Efficiency Air Cleaner Fresh Air Exchanger The Best Cure For Dryness ® Nobody Makes Clean Air Easier ® Only The Fres...