Specifications

Refrigeration Circuit
Refrigerantiscompressedbythecompressortoa
gas with high temperature and high pressure, which
then travels to the condenser (air or water cooled)
to condense the gas into a liquid. Liquid travels to
the evaporator (refrigerant-to-air part of the heat
exchanger)andbacktothecompressorsuction
side.Theprocessthenrepeats.Athermalexpansion
hot gas by-pass valve is used on the non-cycling
dryers as a freeze protector in low load conditions
(200scfmratedmodels[1HP]andup).
Compressed Air Circuit
The compressed air dryer circuit uses a patented
air-to-airheatexchanger,whichactsasaprecooler/
reheater(scfmratedmodels75andup).Hot,
saturated, compressed air first enters the air-to-air
heatexchanger,whereitispre-cooledbyoutgoing
airfromtheair-to-refrigerantheatexchanger.
Thisenergysavingheatexchangerprovides
several advantages, such as a reduction of the heat
load imposed on the refrigerant compressor and
condenser, providing more energy to the outlet
air, and preventing condensation of moisture
on the outside of the plant distribution air line
piping.Fromtheair-to-airheatexchanger,air
will enter into the evaporator further reducing its
temperature to a desired pressure dew point. As
the air is cooled, moisture is condensed, separated,
and discharged through the condensate drain.
The cooled air then reenters the air-to-air heat
exchanger,inadirectionoppositetotheflowof
the warm, saturated incoming air. This counter
flow action assures high temperature differential
throughouttheheatexchanger,resultinginamore
effective heat transfer.
compressor
liquid
receiver
air out
air in
refrigerant
inlet
refrigerant
outlet
air cooled
condensor
suction
accumulator
Air to Refrigerant Heat Exchanger
Refrigerant Circuit
TypicalSchematicFlowDiagram(10-60and1600-2000scfmratedmodels)
7
Non-CyclingRefrigeratedAirDryer