Disconnect the power cord,
remove the air cleaner from your heating/cooling system, and take
the unit outside. Undo the two clips holding the air cleaner together
and open like a book on a flat surface, removing the center screen.
Notice that if the collector pads have changed from a snow-white
color to a dirty gray or black, it is time to remove and discard
the two collector pads.
Brush any heavy dust accumulation
from the outside screens with a soft cloth or the old pads. Insert
two clean pads, making sure that they are well centered in the frame.
Replace the center screen, close the air cleaner, and reposition
the two clips, which hold the air cleaner together. Check that the
two pads did not shift as you closed the air cleaner leaving gaps
between the media pads and the edge of the air cleaner frame.
Replace the air cleaner in
you heating/cooling system, reconnect the power cord, and observe
that the light is "ON".