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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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