Aprilaire 8552 owner manual

Models: 8552

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completed unless an override temperature has been entered. Note that a Flame icon, “ “ is on the display, which flickers when the furnace is running.

Automatic Heating and Cooling: This mode can be useful during times of the year and in climates when it is cool at night requiring heating but warm in the afternoon requiring cooling. Press and release the MODE button until the word "AUTO" appears on the display. In this mode the cooling and heating system will maintain temperature according to the programming previously completed unless an override temperature has been entered. The heating and cooling systems will not operate

at the same time. Either will turn on depending on which programmed set point is closest to the

room temperature. Note that both the Snowflake, ““, and Flame, “ “, icons are on the display. The Snowflake will flash or the Flame will flicker depending on which equipment is running.

Turning the System Off: Press the MODE button until the word "OFF" appears on the display. In this mode neither heating or air conditioning will operate regardless of the temperature. The thermostat can still be programmed, the optional outdoor temperature sensor will work and the furnace fan will turn on if the FAN button is pressed. To avoid frozen water pipes, DO NOT use the OFF mode for long periods of time during sub-freezing temperatures.

NOTE: After selecting a new mode, the thermostat initiates a delay of up to 4 minutes to protect the heating and cooling equipment.

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Aprilaire 8552 owner manual