Aprilaire 8551 TIME CONTROL

•Change Between °C and °F : The thermostat has the capability of displaying either Celsius
or Fahrenheit temperatures. If the displayed temperature seems abnormally high or low
(ie: 70˚F = 21˚C) you may need to switch to ˚C or ˚F by simultaneously pressing the
DECREASE button and the INCREASE button.
•Checking the Outdoor Temperature: If your thermostat was installed with the optional
Aprilaire®Outdoor Temperature Sensor, simply press the OUTDOORbutton and the
thermostat will display the outdoor temperature for 3 seconds before automatically returning
to the actual room temperature display.
TIME CONTROL
•Change From 12- to 24-Hour Clock:Press and release the CLOCK button, then press the MODE
button. To return to a standard clock, repeat the process.
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