■
Refrigerant pipes and components are
positioned in such a way that it is not
likely that they be subjected to substances
that can corrode components containing
refrigerant, if these components are not
made of material that is resistant against
corrosion, or not appropriately protected
against such corrosion.
Checking electrical equipment
Repair and maintenance of electrical com-
ponents must include initial safety checks
and procedures for component inspection.
In the event of a fault, which can cause a
safety risk, do not supply any power to the
circuit until the fault has been rectified. If
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
during 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 gaskets, incorrect grommets etc.
Ensure that the apparatus is secured prop-
erly.
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.
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
NIBE F470Chapter 1 | Important information6
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