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Technical description
11.5 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.
11.6 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.
11.7 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.
11.8 Cooling-water regulating valve
The cooling-water regulating valve 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 :
11.9 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.
11.10 Capillary tube
The capillary tube is a copper tube with a reduced diameter which is located between the condenser and the
evaporator, serving as a restrictor to reduce the pressure of the refrigerant. The pressure reduction serves to reach an
optimum temperature inside of the evaporator. The lower the outlet pressure at the capillary tube, the lower the
evaporation temperature.
The length and the inner diameter of the capillary tube are exactly dimensioned to ensure the performance of the
dryer. Settings or maintenance works are not required.
11.11 Air-to-air heat exchanger
The purpose of this exchanger is to drop the heat of the incoming compressed air onto the outgoing cold air. The
benefits of this solution are essentially two: the incoming air is already partially cooled so the refrigerating circuit can
be sized as to assure a limited thermal heat, with a 40÷50% energy saving. Secondly no cold air is allowed into the
compressed air line, thus preventing the system's pipes sweating.
11.12 Air-to-refrigerant heat exchanger
Also called evaporator. The liquid formed in the condenser is evaporated in this part of the circuit. In the evaporation
phase the refrigerant tends to absorb the heat from the compressed air present in the other side of the exchanger.
Refrigerant and air are in counter flow, thus contributing to limit pressure drop and to provide efficient thermal
exchange.
30
R134.a pressure 10 barg (± 0.5 bar)
R407C pressure 16 barg (± 0.5 bar)
DRYPOINT® RS 25-1010 HP50
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