ZEKS CFX NC Series, Техническое руководство

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10
Do not rotate Hot Gas By-Pass valve adjustment nut fully clockwise. Full clockwise
rotation may result in refrigerant compressor damage. Any suction pressure setting
above 90 psig is not recommended.
CAUTION
ZEKS air cooled models utilize a microprocessor-controlled fan contactor to control the
condensing temperature. This contactor controls the condensing temperature by
cycling the fan based on refrigerant discharge pressure. When the unit reaches 275
psig, the microprocessor energizes the fan contactor that will run the fan until the
discharge pressure is reduced to 195 psig. On 700NCE and 800NCE dryers, should
the discharge pressure continue to rise, a secondary fan will energize at 335 psig and
continue to operate until the discharge pressure has been reduced to 235 psig.
For water cooled models, a high pressure cut out switch is positioned near the water
regulating valve. The switch is designed to open at 320 psig and close at 270 psig.
The DPC™ controller includes a digital readout for monitoring the discharge
pressure of the refrigerant gas exiting the compressor. This reading will vary
depending 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. The water regulating
valve comes pre-adjusted from the factory at 250 psig discharge pressure.
To compensate for water tempera-
ture 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.
WEATHERPROOF PACKAGE (OPTIONAL)
Dryers equipped with the optional Weatherproof Package are designed to operate in
ambient conditions as low as 35 °F.
ADJUSTMENT SCREW
FIGURE 3
WATER REGULATING VALVE
Drawing 600562