Aprilaire 8555 owner manual 110-793B 7/11/01 329 PM

110-793B 7/11/01 3:29 PM Page 25

thermostat panel, not on the display). If your heating/cooling system has the required controls for automatically determining when to change the air filter, this feature is beneficial. Consult your contractor for further information.

No. 8 – Free LED 2 with LCD Wrench Symbol. When moved to the ON position, this switch turns on a Wrench icon on the display screen when a 24-volt signal is sent to LED 2 (top right edge of the thermostat panel, not on the display). This feature is beneficial if your heating/cooling system has the required controls for automatically signaling when a particular problem exists. Consult your contractor for further information.

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