AADCO 737 Series Operating Instructions Manual page 41

also be adjusted to maintain the 80-psig cut off because of the interaction of the
two knobs.
14.8 Continued
NOTE: ONCE THE SWITCH HAS RESPONDED TO THE PRESSURE
CHANGES BY TURNING THE COMPRESSOR ON OR OFF, IT IS
NECESSARY THAT THE SWITCH PERFORM ITS OPPOSITE
FUNCTION BEFORE THE EFFECT OF ANY SETTING CHANGE
CAN BE PERCEIVED. IF THE COMPRESSOR HAS TURNED OFF,
IT IS NECESSARY THAT THE PRESSURE IN THE BALLAST TANK
DECREASE AND THE COMPRESSOR CUT ON AGAIN BEFORE
THE NEXT OFF PRESSURE READING WILL BE RELEVANT.
SIMPLY ALTERING THE HIGH PRESSURE SETTING AT ONE
END OF THE PRESSURE RANGE OR THE OTHER WHILE AT
THAT PRESSURE, IS IMPRACTICABLE.
14.9 It is possible to make fairly close pressure settings for both the 60-psig and 80-
psig settings by following the directions above. However, if unable to achieve
the 20-psig range nor the 60 and 80-psig readings, replace the pressure switch
with one which has been pre-set. See Section 18.0, Parts List.
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