Great Plains DICKEY-john AI-120 - Manual (Page 10)

Zeroing the Split-Air Pressure
Next make sure that Channel 2
is a black box , as shown here,
by touching it.
Sec. 6A
Select the Summary Button
Once you have blackened in Ch. 2 box
you may now touch the area shown
here.
This will take you to the Channel
Setup screen.
Zeroing the pressure in the split air is
recommended throughout the day due
to barometric pressure changes.
This is done by touching the area
shown here. Fan must be off to enable
pressure reset.
2012-12 10 401-909M