a) When the dryer is switched on, it delivers the coolant to the system under high pressure and
temperature and the compressor operates continuously without fail.
b) The hot coolant is cooled down by fan in the condenser to make it liquid. And fan operation
is controlled by the pressure switch or heat sensor mounted at the condenser outlet.
c) The liquefied gas is stored in the liquid tank. And the coolant stored in liquid Is sprayed from
the liquid tank to the heat exchanger by means of expansion valve or capillary piping. This
expansion valve and capillary piping are protected by the particle-retaining filter coupled
with the dryer filter and body.
d) The coolant thus sprayed takes over the heat of the air passing through the heat exchanger
to cool it. While the compressed air is cooled down, the coolant in liquid form is converted
back to the gas phase and suctioned by the compressor. This closed circuit gas cycle
continues constantly.
e) In order to keep constant the pressure and temperature of the coolant in the heat
exchanger, hot gas is delivered from the hot gas delivery line of the compressor to the hot
gas return by means of a by-pass valve. And in case of some dryers, the pressure of the heat
exchanger is controlled by the expansion valves (regulator).
COMPRESSED AIR CIRCUIT
When the compressed air passes through the initial cooling circuit in the heat exchanger, it is mixed
with the compressed air cooled down to +3oC to perform initial cooling process. After passed the
initial cooling circuit, the air is cooled down to the intended temperature of 3oC at the section where
gas-air comparison is made. The compressed air cooled down Is discharged at the water separator by
the time-regulated drain valve.
