POCO line 5961008/00 Benutzerhandbuch Seite 73

detector using a naked flame) shall not be used.
6. Leak detection methods
The following leak detection methods are
deemed acceptable for systems containing
flammable refrigerants.
Electronic leak detectors shall be used to detect
flammable refrigerants, but the sensitivity may not
be adequate, or may need re-calibration.
(Detection equipment shall be calibrated in a
refrigerant-free area.) Ensure that the detector is
not a potential source of ignition and is suitable
for the refrigerant used. Leak detection
equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to
the refrigerant employed and the appropriate
percentage of gas (25 % maximum) is confirmed.
Leak detection fluids are suitable for use with
most refrigerants but the use of detergents
containing chlorine shall be avoided as the chlo-
rine may react with the refrigerant and corrode
the copper pipe-work.
If a leak is suspected, all naked flames shall be
removed/ extinguished.
If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered
from the system, or isolated (by means of shut off
valves) in a part of the system remote from the
leak. Oxygen free nitrogen (OFN) shall then be
purged through the system both before and
during the brazing process.
-69-