Getting Familiar With The Aprilaire Thermostat; Temperature Display; Mode Button; Temperature Settings - Day/Night Button - Aprilaire 8533 Owner's Manual

110-964B 7/12/01 9:14 AM Page 5

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)
– 3 –