Leak Testing - Nibe S2125 Sicherheitsinformationen

the fault cannot be rectified immediately,
and operation must continue, an adequate
temporary solution must be implemented.
This must be reported to the equipment
owner, so that all parties have been in-
formed.
The following checks must be carried out
at the initial safety checks.
That the capacitors are discharged. Dis-
•
charging must be done safely, to prevent
the risk of sparking.
That no powered electrical components
•
or live cables are exposed when filling or
collecting refrigerant or when the system
is flushed.
That the system is continually earthed.
•
REPAIRING SEALED COMPONENTS
When repairing sealed components, all
electrical supply must be disconnected
from the equipment that is being repaired
before any sealed covers or similar are re-
moved. If it is absolutely necessary to have
an electricity supply to the equipment dur-
ing the service, continuously activated leak
tracing must be performed at the most
critical points in order to warn of any dan-
gerous situations.
Pay particular attention to the following so
that the sheath is not changed in a way that
affects the protection level when working
with electrical components. This means
damage to cables, unnecessary amounts
of connections, terminals that do not follow
the original specifications, damaged gas-
kets, incorrect grommets etc.
Ensure that the apparatus is secured
properly.
Check that seals or sealing materials have
not deteriorated to a degree that they can
no longer prevent combustible gases from
entering. Replacement parts must meet the
manufacturer's specifications.
24
NOTE
Use of silicone seals can hamper the
efficiency of certain types of leak-
tracing equipment. Components
with built in safety do not need to
be isolated before starting work.
WIRING
Check that cabling will not be subject to
wear, corrosion, excessive pressure, vibra-
tion, sharp edges or any other adverse en-
vironmental effects. The check shall also
take into account the effects of aging or
continual vibration from sources such as
compressors or fans.

LEAK TESTING

The following leak detection methods are
deemed acceptable for systems containing
flammable refrigerants.
Electronic leak tracers must be used to de-
tect combustible refrigerant; but the leak
tracer may not be sufficiently sensitive or
may need to be recalibrated (the leak tra-
cing equipment must be calibrated in an
area completely free from refrigerant). The
leak tracer must not be a potential source
of ignition and must be suitable for the rel-
evant refrigerant. The leak tracing equip-
ment must be set and calibrated for the
relevant refrigerant, to ensure that the gas
concentration is a maximum of 25% of the
lowest combustible concentration (Lower
Flammability Limit, LFL) of the relevant re-
frigerant.
Leak detection fluids are suitable for use
with most refrigerants but the use of deter-
gents containing chlorine shall be avoided
as the chlorine may react with the refriger-
ant and corrode the copper pipe-work.
If a leak is suspected, all naked flames shall
be removed/extinguished.
If a leak that requires brazing is detected,
all refrigerant must be removed from the
system and stored in a separate container.
Alternatively, the refrigerant can be stored
separated from the brazing area in a part
of the system at a safe distance from the
S2125 | GB