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Instruction book Oil-free Air Division
1 LEADING PARTICULARS
Note: Fig. 2 shows the air and refrigerant flow diagram of
FD560 and FD700. The flow diagram of FD850 up to FD1600
looks similar, but these dryers are provided with two condensate
separators and two liquid separators. The description below is
valid for all dryers described in this book.
1.1 General description
The FD air dryers remove moisture from compressed air by
cooling the air to near freezing point. This causes water and
oil to condense. The condensate is automatically drained. The
air is warmed up before leaving the dryer.
On air-cooled dryers, the condenser has a cooling fan controlled
by a condenser pressure switch. Water-cooled dryers have an
automatic regulating valve in the water outlet of the condenser.
FD560 up to -950 are air-cooled, while FD560 W up to -1600
W are water-cooled dryers. The suffix W is not mentioned
further in the book where the descriptions are valid for both
air- and water-cooled dryers.
1.2 Air circuit (Fig. 2)
Compressed air enters air/air heat exchanger (16) and is pre-
cooled by the outgoing, cold, dried air. Water and oil in the
incoming air start to condense. The air then flows through air/
refrigerant heat exchanger/evaporator (15) 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 and oil in the air condense. The cold air then flows
through separator(s) (3) where all the condensate is separated
from the air. The condensate collects in condensate trap (4)
and is automatically drained. From separator(s) (3) the cold
dried air flows through air/air heat exchanger (16), where it
Fig. 1. General view of FD560
50149F
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