fiac TDRY 6-18 Manuel D'instructions page 52

The refrigerating compressor is the pump of the system where the gas coming from the evaporator (low
pressure side) is compressed up to the condensation pressure (high pressure side). All the compressors
used are manufactured by primary companies and are designed for applications where high compression
ratios and wide temperature changes are present.
The fully sealed construction is perfectly gas tight, so ensuring high-energy efficiency and long useful life.
The pumping unit is supported by dumping springs, in order to consistently reduce the acoustic emission
and the vibration diffusion. The electric motor is cooled down by the aspirated refrigerating gas, which goes
through the coils before reaching the compression cylinders. The internal thermal protection protects the
compressor from overheating and overcurrents. The protection is automatically restored as soon as the
nominal temperature conditions are reached.
The condenser is the element in which the gas coming from the compressor is cooled down and condensed
becoming a liquid. Mechanically, it is formed by a copper tubing circuit (with the gas flowing inside)
immersed in an aluminium blades package.
The cooling operation occurs via a high efficiency axial ventilator which, in applying pressure on the air
contained within the dryer, forces it into the blades package.
It is mandatory that the temperature of the ambient air will not exceed the nominal values. It is important TO
KEEP THE UNIT FREE FROM DUST AND OTHER IMPURITIES.
The condenser is the element 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 IMPURITIES AND OTHER
CORROSIVE SUBSTANCES.
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.
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 42-
45 °C.
5.5 REFRIGERATING COMPRESSOR
5.6 CONDENSER (Air-Cooled)
5.7 CONDENSER (Water-Cooled)
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