Technical data

Technical description
ACT 600 – 5000 21 – EN
7.5 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 refrigerant 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.
7.6 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.
7.7 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.
7.8 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.
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 : R407C pressure 232 psig (± 7.3 psi) [16 barg (± 0.5 bar)]
7.9 Filter dryer
Traces of humidity and slag can accumulate inside the refrigerant circuit. Long periods of use can also
produce sludge. This can limit the lubrication efficiency of the compressor and clog the expansion valve or
capillary tube. The function of the filter drier, located before the capillary tubing, is to eliminate any impurities
from circulating through the system.