The DPC™ controller includes a digital readout for monitoring the discharge pressure
of the refrigerant gas exiting the compressor. This reading will vary dependent upon
condenser type as indicated below:
• For air-cooled applications, condensing fans are cycled on and off by the DPC
based on the refrigerant discharge pressure. Primary fan(s) are cycled on at 235
psig and off at 195 psig. Should the discharge pressure continue to climb above
265 psig, the secondary condensing fans will cycle on. As discharge pressure is
reduced below 210 psig, the secondary fan(s) will cycle off. On 1000 and
1200HSF models, two condensing fans are utilized. The 1600HSF has three
condenser fans. For the 1600HSF, the center fan is the primary controlled fan
the outside fans are the secondary controlled fans.
• Water cooled condensers utilize a water regulating valve (Note Figure 2). The
water regulating valve comes pre-adjusted from the factory at 250 psig discharge
pressure. To compensate for water temperature variation, 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.
ADJUSTMENT SCREW
FIGURE 2
WATER REGULATING VALVE
Drawing 600562
9
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