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User Manual Series F-BO-AFE70
8.3
Connection of the compressed air
The Automatic Purging Unit F-BO-AFE70 is provided with a commercial push-in fitting for easily
connecting the compressed air via a hose with an outer diameter of 10mm.
The push-in fitting of the Automatic Purging Unit F-BO-AFE70 may only be connected and dis-
connected by applying a counteracting force on the pipe elbow on the input of the valve in order
to avoid excessive strain. Connection and disconnection without applying an adequate counter-
acting force can cause damage to the solenoid valve, the cover of the Purging unit and the push-
in fitting.
It is recommended that a shut-off device for the compressed air should be installed before the
compressed-air connection of the Purging unit; this makes installation, commissioning and any
maintenance jobs easier.
Only turn on the compressed-air supply after finishing all mounting, installation, connec-
tion and parameterisation work in the course of commissioning, as described starting on
page 40 in Chapter 10: „Commissioning and function test". Turning on the compressed-air
supply at an earlier time can result in severe damage or injuries, depending on the condi-
tion of the system and the environment.
The compressed-air supply must be engineered in such a way that the maximum permiss-
ible input overpressure of the Purging unit will not be exceeded, see from page 43 onwards
in Chapter 12: „Specifications".
If the used compressed-air supply can exceed the permissible pressure, a pressure regulator must be
used. This pressure regulator must be constructed in such a way that it does not limit the air flow
rate in an inadmissible way. The maximum permissible positive operating pressure as well as the
recommended air flow rate for the Purging unit that you are using can be found from page 43
onwards in Chapter 12: „Specifications".
Furthermore, the compressed-air supply must be engineered such that the compressor and the com-
pressed-air vessel as well as the supply line up to the Purging unit are sufficiently dimensioned, so
that during the Purging process the pressure that is available at the input of the Purging unit does
not decrease to an insufficient value, in which case the required air flow rate would no longer be
ensured for the duration of the Purging process.
The compressed air must always be clean and free from oil and water or other contamination. If
compressed air is used which is not sufficiently purified, these contaminations can result in mal-
functions of the Purging unit or of the aspirating smoke detector. For example, the valve piston
system of the Purging unit can ice up or the measuring device of the aspirating smoke detector
can become oily, and therefore can become useless or can even be destroyed. This can also lead
to false alarms or increased contamination of the aspirating smoke detector as a result of particles
in the compressed air, which are again drawn in by the evaluation unit of the aspirating smoke
detector after a Purging process.
I56-4252-010
D200-104-00
Chapter 8 • Mounting and connection of pneumatic components
29
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