Hussmann LBN Installation And Service Instructions Manual page 17

If it becomes necessary to check
or reset the setting, the cabinet
must be warm such as after a
defrost cycle or from an initial
warm cabinet condition.
Put a suction compound gauge
on the compressor suction valve,
start the compressor. If the
pressure needs to be reduced
turn the adjustment screw
clockwise or, counterclockwise
to raise the pressure.
DO NOT SET THE VALVE
BASED ON THE NAMEPLATE
AMPERAGE RATING AS THE
PRESSURE SETTING WILL
BE TOO HIGH AND THE
COMPRESSOR WILL NOT
START PROPERLY.
17