Beko DRYPOINT M PLUS Instructions De Montage Et De Service page 14

Instructions for installation and operation
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14 DRYPOINT DM 10-34 C-N, DM 10-41 C-N, DM 10-47 C-N, DM 20-48 C-N, DM 20-53 C-N, DM 20-60 C-N, DM 20-67 C-N,
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12
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D
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F
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A
DM 40-61 C-N, DM 40-75 C-N, DM 40-90 C-N
3.3 Function
Humid compressed air (2) enters the de-
vice through the housing head (1) and
flows downwards through the core tube
of the membrane element (5). A nanofilter
(6) installed in the outlet of the core tube
removes residual aerosols and particles
from the compressed air. Condensate is
drained off at the bottom of the device.
In the nanofilter element zone, the direc-
tion of flow is reversed so that the humid
compressed air is fed through the mem-
branes of the inner membrane element.
Downstream of the membrane element, a
partial compressed air flow (9) is continu-
ously diverted and atmospherically ex-
panded at a nozzle (3).
Through this expansion, the purge air be-
comes significantly drier, as the humidity
in the compressed air is distributed across
a multiple of the initial air volume. In the
membrane element (5), the extremely dry
purge air (10) is fed along the outside of
the membranes and distributed evenly.
As a consequence, there are now two
air flows with different moisture content
flowing in opposite directions through the
membrane element, separated only by the
membrane wall (5): humid compressed
air at the inside and dry purge air at the
outside.
As a result of the humidity difference,
moisture diffuses from the compressed air
to the purge air.
Dry compressed air (8) leaves the
DRYPOINT M PLUS compressed air
®
membrane dryer.
The humid purge air (12) is discharged
into the environment.
3.3.1 Function of purge air shut-off
A partial flow of dried compressed air
flows through a small channel in the head
(A) to the functional block (B).
The functional block (B) is equipped with
a solenoid valve (C) that is triggered ex-
ternally (e.g. by a signal from the com-
pressor). If the compressed air drying pro-
cess requires purge air, the solenoid valve
(C) must be powered.
The purge air nozzle (D), which is di-
mensioned to release a specific volume
of purge air, is installed in the functional
block (B). If the solenoid valve (C) is open,
a defined volume of purge air is depres-
surized behind the purge air nozzle (D)
and fed through a small tube (E) to the
nozzle body (F).
From the nozzle body (F), the dry purge
air flows to the back of the membrane fib-
ers to dry the compressed air.
US-EN