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Technical description
8.5
Refrigerating compressor
The employed refrigerating compressors are constructed by leading manufacturers. The hermetically sealed
construction is absolutely gastight. The integrated safeguard protects the compressor against overheating and excess
current. The protection is automatically reset as soon as the nominal conditions are reached again.
8.6
Condenser (air-cooled)
The condenser is the component in which the gas coming from the compressor is cooled down, condensed and
liquefied. Under no circumstances must the temperature of the ambient air exceed the nominal values. It is also
important that the condenser unit is kept free from dust and other impurities.
8.7
Condenser (water-cooled)
The condenser is the component in which the gas coming from the compressor is cooled-down, condensed and
liquefied.
The water inlet temperature must not exceed the nominal values. Likewise, a correct flow must be ensured. The water
entering the condenser must be free from impurities.
8.8
Cooling-water regulating valve
The cooling-water controller serves to keep the condensation pressure or the condensation temperature constant
during water cooling. When the dryer is switched off, the valve automatically blocks the cooling-water flow.
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.
Water valve setting :
8.9
Filter dryer
Despite controlled vacuuming, traces of moisture can accumulate in the refrigeration cycle. The filter dryer serves to
absorb this moisture and to bond it.
8.10 Thermostatic expansion valve
The purpose of this valve is to regulate the refrigerant flow across the dryer relative to the heat load. It's operation is to
maintain a constant condition in the evaporator, regardless of load variations, to provide the correct dew point and
prevent liquid refrigerant returning to the compressor.
8.11 Aluminium heat exchanger
The heat exchanger module consists of an air/air heat exchanger, an air/refrigerant heat exchanger, and of a high-
performance separator. The compressed air flows top-down through the heat exchanger. The large cross-sections of
the flow passages cause low flow rates and low compressed-air losses. In the air/air heat exchanger, the heat
exchange is effected in a reverse current. This guarantees maximum heat transfer. The heat transfer in the
air/refrigerant heat exchanger also takes place in a reverse current. This allows full evaporation of the refrigerant. The
high-performance separator ensures almost complete separation of the condensate. Maintenance of the high-
performance separator is not required.
16
R134.a pressure 10 barg (± 0.5 bar)
R407C pressure 16 barg (± 0.5 bar)
DRYPOINT® RA 1300-4400 eco
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Troubleshooting
