Technical description
DRYPOINT RA 200 – 2500 NA
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5.5.
Refrigerating compressor
The refrigerating compressor is the pump in the system, gas coming from the evaporator (low pressure side) is
compressed up to the condensation pressure (high pressure side). The compressors utilized are manufactured by
leading manufacturers and are designed for applications where high compression ratios and wide temperature
changes are present.
The hermetically sealed construction is perfectly gas tight, ensuring high-energy efficiency and long, useful life.
Dumping springs support the pumping unit in order to reduce the acoustic emission and the vibration diffusion. The
aspirated refrigerating gas, flowing through the coils before reaching the compression cylinders cools the electric
motor. The thermal protection protects the compressor from over heating and over currents. The protection is
automatically restored as soon as the nominal temperature conditions are reached.
5.6.
Condenser (Air-Cooled)
The condenser is the component in which the gas coming from the compressor is cooled down and condensed
becoming a liquid. Mechanically, a serpentine copper tubing circuit (with the gas flowing inside) is encapsulated in an
aluminum fin package.
The cooling operation occurs via a high efficiency fan, creating airflow within the dryer, moving air through the fin
package. It’s mandatory that the ambient air temperature does not exceed the nominal values. It is also important to
keep the condenser unit free from dust and other impurities.
5.7.
Condenser (Water-Cooled)
The condenser is the component in which the gas coming from the compressor is cooled down and condensed
becoming a liquid. Basically it is a water/refrigerating gas exchanger where the cooling water lowers the temperature of
the refrigerating gas.
The temperature of the inlet water must not exceed the nominal values. It must also guarantee an adequate flow and
that the water entering the exchanger is free from dust and other impurities.
5.8.
Condenser water regulating valve (Water-Cooled)
The condenser water regulating valve is used to keep the condensing pressure/temperature constant when the Water-
Cooled is being used. Thanks to the capillary tube, the valve detects the pressure in the condenser and consequently
adjusts the water flow. When the dryer stops the valve automatically closes the cooling water flow.
CAUTION!
The condenser water regulating valve is an operating control device.
The closure of the water circuit from the pressure condenser water regulating valve cannot be used as a
safety closure during service operations on the system.
ADJUSTMENT
The condenser water regulating valve is adjusted during the testing phase to a pre-set value that covers 90%
of the applications. However, sometimes the extreme operating conditions of the dryer may require a more
accurate calibration.
During start-up, a qualified technician should check the condensing pressure/temperature and if necessary
adjust the valve by using the screws on the valve itself.
To increase the condensing temperature, turn the adjusting screws counter-clockwise; to lower it turn the
screws clock-wise. Adjust the valve in order to guarantee a condensing temperature of 108-113 °F (42-4 5 °C).
Summary of Contents for DRYPOINT RA 1000/AC NA
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Page 39: ...List of attachments DRYPOINT RA 200 2500 NA 39 7 2 4 Exploded view DRYPOINT RA 600 1250 NA ...
Page 40: ...List of attachments 40 DRYPOINT RA 200 2500 NA 7 2 5 Exploded view DRYPOINT RA1500 2500 NA ...
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