Honeywell Excel 5000 Open System User Manual page 7

Fanspeed
If you press the ▼ or ▲ control button briefly, you lower or
increase the fanspeed to a setting of "off", "one", "two", or
"three". If you press it for longer, you lower or increase the
fanspeed to the maximum value ("off" or "three").
Lowering
Press .
►
Press ▼.
►
The fanspeed is lowered.
Increasing
Press .
►
Press ▲.
►
The fanspeed is increased.
Setting to automatic operation
Press .
►
Press ok.
►
The fanspeed is set to 'automatic operation'.
Adjust functions
5 EN2B-0205