Chapter 11 • Inspection
User Manual Series F-BO-AFE70
11
Inspection
Only flawless high-quality parts are used for the production of the Automatic Purging Unit
F-BO-AFE70. Nevertheless, all used parts are subject to natural aging and wear. For reasons of
safety it is therefore recommended that the Automatic Purging Unit F-BO-AFE70 should be
replaced with new units after 10 years of operation.
Under normal environmental conditions, a visual inspection and a functional check of the Auto-
matic Purging Unit F-BO-AFE70 should be carried out once a year. On this occasion, the correct
operation of the electronics as well as of the mechanics must be checked.
For this purpose it is not necessary to disassemble the Automatic Purging Unit F-BO-AFE70,
removing the cover after loosening the two screws is sufficient.
In the course of the visual inspection, all components that are accessible after removing the cover
have to be examined for damage and aging.
Check whether all screws have been securely tightened and, if necessary, tighten them.
The proper functioning of the electronics, including the transmission of faults to the fire detection
control panel is to be checked by simulating the operating conditions on the evaluation unit of the
aspirating smoke detector or on the terminals of the F-BO-AFE70.
To check the proper mechanical functioning, an acoustic check together with the check of the
measured air flow values on the aspirating smoke detector are enough:
When the Purging process is started, a shock which can be felt with the hand and which is
clearly audible without any aid must be perceptible. This indicates that the piston has opened
completely, the air flow to the aspirating smoke detector has been interrupted and the com-
pressed air is being introduced into the pipe network. The piston is in the Purging position. In
this state, the measured air flow value on the aspirating smoke detector must clearly change into
the fault range.
After completion of the Purging process, a soft shock must be audible. This indicates that the
piston is pushed back completely, up to the aluminium cover of the housing. The piston is in the
idle position again. Whether the piston has been pushed back properly can also be observed with
the air flow measurement of the aspirating smoke detector; the measured value must return to
the value before the start of the Purging process.
Since the second shock is relatively soft, a suitable sound bridge can be used between the alu-
minium housing and the ear, in order to improve the sound transmission.
If you are not sure that the piston can freely move between idle position – Purging position – idle
position, the Automatic Purging Unit F-BO-AFE70 must be replaced.
The Automatic Purging Units F-BO-AFE70 are high-precision devices that are assembled
and function-tested with special equipment and know-how. Disassembly and reassembly
without this equipment or without appropriate know-how can lead to malfunctions which
can result in risk of injuring persons and in damage to property, and therefore has to be
refrained from.
I56-4252-010
D200-104-00
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Summary of Contents for F-BO-AFE70 Series
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