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6.6 CONTROLS
The ZEKS HeatSink™ dryer incorporates automatic controls for proper operation.
The standard microprocessor is the Compustat Controller.
NOTE:
For dryers equipped with the optional DPC Plus Controller, refer to the DPC
Supplement that accompanies this Technical Manual for specific instruction on
operating the HeatSink™ dryer with the DPC Plus Controller.
The thermal mass fluid temperature is maintained by the microprocessor that
monitors the temperature and cycles the refrigeration system in response to varying
air flow and temperature. Upon an increase in the temperature of the thermal mass
fluid, the compressor is cycled on. When the fluid is cooled to its control set point,
the compressor is cycled off. The thermal mass fluid functions as a thermal storage
mass in the HeatSink™ dryer.
A low pressure cut out (LPCO) switch is provided for all HSG series dryers. This
switch is factory set to open at 30 psig. If the refrigerant suction pressure draws
below 30 psig, the LPCO opens to shut off the refrigerant compressor. Once the
switch has opened, it will prevent the compressor from running until the suction
pressure rises above 60 psig and the LPCO has been manually reset.
When the optional gauge package is included, inlet air temperature, outlet air
pressure, refrigerant suction and discharge pressure gauges are supplied.
1) Refrigerant discharge gauge monitors the pressure of the refrigerant gas exiting the
compressor. This reading will vary dependent upon condenser type as indicated below:
• Air Cooled condensers with ambient temperatures between 80°F and 100°F: the
refrigerant discharge gauge should read between 275 - 350 psig.
• Water cooled condensers utilize a water regulating valve (See Figure 2):
the water regulating valve comes pre-adjusted from the factory at 250 psig
discharge pressure.
ADJUSTMENT SCREW
FIGURE 2
WATER REGULATING VALVE
Drawing 600562
