Aprilaire 8551 - Manual (Page 15)

EQUIPMENT CONTROL
• Turning on the Fan: At any time the system fan can run continuously by pressing the FAN button.
The Fan icon, “ “, will appear in the lower part of the display indicating that the fan is
operating continuously. To return the fan to the normal operating mode, press the FAN button again
which will remove the icon from the display. In the normal operating mode the fan will only run when
the air conditioning is operating. Continuous fan operation is beneficial if your system is equipped with
a high efficiency air cleaner, or to circulate air in the home when the air conditioning is not needed.
• Selecting Cooling Mode: Press the MODE button until the word "COOL" appears on the display.
In this mode the air conditioning system will maintain temperature according to the programming
previously completed unless an override temperature has been entered. Note that a Snowflake icon,
“ “, is on the display, which flashes when the air conditioning is running.
• Turning the System Off: Press the MODE button until the word "OFF" appears on the display. In this
mode, the air conditioning system will not operate regardless of the temperature. The thermostat can
still be programmed, the optional outdoor temperature sensor will work, and the fan will turn on if the
FAN button is pressed.
NOTE: After selecting a new mode, the thermostat initiates a delay of up to 4 minutes to protect the cooling equipment.
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