Honeywell F52F Owner's Manual page 6

When the fan stops, the neon light
goes out, as does the ON LED on the
ONE-CELL MODEL SHOWN.
Solid State Performance Indicator. The
air cleaner is off until the heating or air
conditioning and fan start again.
ON WASH CHECK
If you do not want the air cleaner to
run, set the ON-OFF switch to OFF to
turn off the air cleaner. Your furnace
and air conditioner will still operate
normally, but without the added benefit
of air cleaning. Normally, this switch
should be ON at all times.
ONE-CELL MODEL SHOWN.
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