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COMPUSTAT CONTROLLER BUTTONS
• ON/OFF
Pressing this button will start or stop the unit. It toggles the unit between on and off.
• EXCHANGER SET
Press this button to adjust the exchanger temperature control set point. The
refrigeration system will cycle on 1.5°F above the set point and cycle off 1.5°F
below the set point.
• DRAIN OPEN
This button controls the length of time, in seconds, the drain will stay open.
• % SAVINGS
Press this button to review how much time the compressor has been running while
the unit has been energized in the DRYER ON condition. This may be reset by
holding down the button for ten seconds.
• When the refrigeration system is running, the suction pressure will pull down
between 50 and 60 psig, depending on load and ambient conditions. After the
thermal mass fluid has been cooled and the refrigeration system is cycled off,
the system pressure will equalize with a gauge reading typically between 80
and 150 psig - depending on ambient temperature.
All water cooled units come with a high pressure cut out (HPCO) switch. This
switch is set to open at 320 psig and close at 270 psig.
To compensate for variation in water temperature, it may be necessary to adjust the
water regulating valve to maintain a 250 psig discharge pressure. Adjustment can
be done by rotating the adjusting screw counterclockwise for an increase in
discharge pressure. For conditions where low water temperature and/or high water
pressure are expected it is advisable to install a water pressure regulator ahead of
the condenser.
2) Outlet air pressure gauge monitors the exiting compressed air pressure. During
normal operation, the outlet air pressure should be within 3 psig of the compressed
air entering the dryer.
3) Inlet air temperature gauge monitors the compressed air temperature entering the dryer.
During normal dryer operation, the temperature reading should be 100°F or lower.
