Section II - Description
Quincy Compressor
13
Compressed air circuit
Compressed air enters heat exchanger (1) and is cooled by the outgoing, cold, dried air.
Water in the incoming air starts to condense. The air then flows through heat exchanger/
evaporator (2) where the refrigerant evaporates, causing the air to be cooled further to
close to the evaporating temperature of the refrigerant. More
water in the air condenses. The cold air then flows through separator (3) where all the
condensate is separated from the air.
The cold, dried air flows through heat exchanger (1) where it is warmed up by the
incoming air.
The condensate is automatically drained by the electronic condensate drain (9).
Refrigerant circuit
Compressor (4) delivers hot, high-pressure refrigerant gas which flows through condenser
(6) where most of the refrigerant condenses.
The liquid flows through liquid refrigerant dryer/filter (7) to capillary tube (8). The
refrigerant leaves the capillary tube at evaporating pressure.
The refrigerant enters evaporator (2) where it withdraws heat from the compressed air by
further evaporation at constant pressure. The heated refrigerant leaves the evaporator
and is sucked in by the compressor.
The condenser (6) pressure must be kept as constant as possible to obtain stable
operation. Fan control switch (P) therefore stops and starts the condenser cooling fan. If,
under partial or no load, the evaporator (2) pressure drops to approximately 2.25 bar(e)
(32.63 psig), the hot gas bypass valve (5) opens and hot, high-pressure gas is fed to the
evaporator circuit to prevent the evaporator pressure from dropping any further.
Automatic drain
The dryers are equipped with an electronic condensate drain (EWD). The condensate
from the condensate trap accumulates in a collector. When the condensate reaches a
certain level, it is discharged through the drain outlet (1).
The condensate can also be drained by pressing the test button (2).
The drain filter can be cleaned by opening the manual drain valve (3), see section
Preventive maintenance schedule.
