Randell 40000 Series Owner's Manual page 11

Figure A - Temperature control adjustments
maximum setting you may need to adjust the pressure control.
Your units pressure control should be set at the time of installation by a qualified
installation contractor. If minor adjustments are needed at a later date, adjust control
by turning the right adjusting screw clockwise (1/4 turn at a time) to a lower number for
colder temperature and counterclockwise to a higher number for warmer temperature.
Note: Numbers are pounds of pressure not degrees F.
Note: Do not adjust the differential screw (Left screw).
The control knob allows for temperature
adjustments, with in the cabinet only. Turning the
knob clockwise will result in increased cooling.
Keep the arrow on the knob pointed within the green
arc. Turning it clockwise beyond the green can
result in freeze-up, while turning it
counterclockwise beyond the green will shut the
compressor off. If your cabinet temperature remains
to warm and your temperature control is at the
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