Instruction Manual Junior II
19
Fig. 28 Condensate drain taps
1 2 3
4.4.4. FILTER SYSTEM P21
DESCRIPTION
The air leaving the final stage is cooled in the after-cooler to
approx. 10 - 15 °C (18 - 27 °F) above ambient temperature
and then enters filter system P21 with TRIPLEX longlife car
tridge (Fig. 29).
The filter assembly consists of separator and cartridge
chamber. In the separator surrounding the cartridge
chamber liquid oil and water particles are reliably separated
from the compressed medium by a pipe nozzle.
Residual oil and water vapors are then removed by the
TRIPLEX longlife cartridge. The quality of the breathing air
produced conforms to DIN EN 12021.
CARTRIDGE SAFETY BORE
The filter system P21 is designed to prevent pressurizing in
the absence of the filter cartridge. A bore provided in the
filter bottom is sealed air-tight only if the cartridge is in place
(Fig. 30).
No pressure build-up without cartridge!
Fig. 29 Filter system P21
1
10
2
3
4
5
7
6
8
9
11
1 Filter inlet
2 Jet pipe
3 Filter head
4 Final pressure safety valve
5 Housing
6 Chamber separator
7 Cartridge
8 Filter outlet
9 Pressure maintaining valve
10 Condensate drain tap
11 Condensate outlet
Without cartridge the venting bore is not sealed, the air es
capes into the atmosphere, no pressure can be built up and
thus it is ensured, that unfiltered air is not supplied to the con
suming device.
The venting bore is also used to check the O-rings on the car
tridge pin. If air is leaking out of the venting bore even though
a cartridge is installed, the O-rings are either broken or were
damaged on installation.
Remove and check cartridge. If necessary replace cartridge
or O-rings.
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