Aprilaire 8553 - Manual (Page 18)

TEMPERATURE CONTROL
• Reading the Actual Room Temperature: The Model 8553 normally displays the room temperature,
not the set-point temperature.
• Check the Set-Point Temperature: Press and release the DECREASE button or INCREASE
button. The thermostat will display the programmed set-point temperature and a thermometer for
5 seconds before automatically returning to the actual room temperature display.
• Temporarily Override the Set Temperature: Press and hold the DECREASE button or
INCREASE button to change the room set-point temperature in 1 degree increments.
The new set-point temperature will be held for 3 hours, then the thermostat will automatically
return to the program.
• Hold a New Temperature Set Point: Press and hold the DECREASE button or INCREASE
button to change the room set-point temperature in 1 degree steps. The new set-point temperature
can be maintained indefinitely by pressing and releasing the HOLD button. The word “HOLD” will
be displayed. The thermostat will maintain this new set-point temperature until the RESUME button
is pressed returning the thermostat to the original program. This procedure is typically used during
extended vacant periods (vacations, business trips, etc.), to hold an economical set point until
you return. – 16 –
110-790B 7/11/01 3:11 PM Page 18