Refrigerating Compressor; Condenser Unit - Gardner Denver RHS20 SCFM Manual

5.4 REFRIGERATING COMPRESSOR

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 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.

5.5 CONDENSER UNIT

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's mandatory that the temperature of the ambient air will not
exceed the nominal values. It is also important TO KEEP THE UNIT FREE FORM DUST AND OTHER IMPURITIES.
5.6 DEHYDRATION FILTER
Traces of humidity and slag which could accumulate inside the chilling plant, or sludge which could occur after long use of
the dryer, could limit the lubrication of the compressor and clog the expansion valves or the capillary tube.
The function of the dehydration filter, located before the capillary tubing, is to stop the impurities, avoiding their circulation
within the system.
5.7 CAPILLARY TUBING
It consists of a piece of reduced cross section copper tubing located between the capacitor and the evaporator to form a
throttling against the flow of the refrigerating fluid. This throttling creates a pressure drop, which is a function of the
temperature to be reached within the evaporator: the smaller the capillary tube outlet pressure, the lower the evaporation
temperature.
The length and diameter of the capillary tubing is accurately sized with the performance to be reached by the dryer; no
maintenance or adjustment is necessary.
5.8 EVAPORATOR
Also called an air-freon exchanger. The liquid formed in the condenser is evaporated in this part of the circuit. In the
evaporation phase the refrigerator tends to absorb the heat from the compressed air present in the other side of the
exchanger. The evaporator is immersed in the cabinet base of the dryer and insulated with non-CFC expanded insulating
foam. The part is entirely constructed in copper and the cooler goes in the opposite direction to the air, thus contributing to
limited pressure loss and to provide efficient thermal exchange.
5.9 LIQUID SEPARATOR (20-25 SCFM dryers only)
It prevents the return of liquid refrigerant to the compressor separating droplets not evaporated from the gas flow.
14