Aprilaire 8554 - Manual (Page 30)

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In Case Of Power Failure
The Model 8554 thermostat does not require a battery. If the power goes out the letters “AC” appear on
the display indicating power is not being supplied to the thermostat. “AC” will remain on the display for
up to approximately 1 hour after the power goes out. During the period that the power is off, the
heating/cooling system will not operate.
This thermostat is equipped with a continuous memory feature which does not require a battery. The
thermostat will never lose what has been programmed regardless of the length of the power outage.
If the thermostat has been set to “Hold” a particular temperature, and the power fails, the thermostat
will resume that temperature when the power is restored.
After a period of 1 hour without power the clock will need to be reset. The clock will default to
12:00 AM. Refer to the Programming Instructions to reset the clock.
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.
110-792B 7/12/01 8:28 AM Page 30