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Instruction book
1.4 Air dryer on GA Full-feature (Fig. 1.6)
1.4.1 Compressed air circuit
Compressed air enters heat exchanger (5) and is cooled by the
outgoing, dried air. Moisture in the incoming air starts to
condense. The air then flows through heat exchanger (6) where
the refrigerant evaporates and withdraws heat from the air. This
cools the air to close to the evaporating temperature of the
refrigerant. More water in the air condenses. The cold air then
flows through condensate trap (MTa) which separates
condensate from air. The condensate is automatically drained
through outlet (Daa). The cold, dried air then flows through
heat exchanger (5), where it is warmed up by the incoming air.
1.4.2 Refrigerant circuit
Compressor (M1) delivers high-pressure refrigerant gas which
flows via liquid separator (7) through condenser (9) where most
of the refrigerant condenses. The liquid flows to expansion
valve (11) where it expands to evaporating pressure. The
refrigerant enters evaporator (6) where it withdraws heat from
compressed air by further evaporation. The refrigerant gas is
sucked in by compressor (M1).
Footnotes chapter 1
1) The valve starts opening at 60 degrees celsius and is fully open at
75 degrees celsius for 13 bar and 175 psi compressors.
2) See User manual for Elektronikon regulator, section “Timer
submenu”.
3) Air-cooled compressors only.
4) Water-cooled compressors only.
5) For high-temperature versions only (consult Atlas Copco).
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