NewAir NAC14KWHH2 Manuel De L'utilisateur page 21

• Particular attention shall be paid to the following to ensure that by working
on electrical components, the casing is not altered in such a way that the
level of protection is affected.
• This shall include damage to cables, excessive number of connections,
terminals not made to original specification, damage to seals, incorrect
fitting of glands, etc. Ensure that apparatus is mounted securely. Ensure that
seals or sealing materials have not degraded such that they no longer serve
the purpose of preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer's
specifications.
REPAIR TO INTRINSICALLY SAFE COMPONENTS
• Do not apply any permanent inductive or capacitance loads to the circuit
without ensuring that this will not exceed the permissible voltage and
current permitted for the equipment in use.
• Intrinsically safe components are the only types that can be worked on while
live in the presence of a flammable atmosphere. The test apparatus shall be
at the correct rating. Replace components only with parts specified by the
manufacturer. Other parts may result in the ignition of refrigerant in the
atmosphere from a leak.
CABLING
• Check that cabling will not be subject to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse environmental effects. The
check shall also take into account the effects of aging or continual vibration
from sources such as compressors or fans.
DETECTION OF FLAMMABLE REFRIGERANTS
• Under no circumstances shall potential sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.
REMOVAL AND EVACUATION
• When breaking into the refrigerant circuit to make repairs – or for any other
purpose – conventional procedures shall be used. However, for flammable
refrigerants it is important that best practice be followed, since flammability
is a consideration. The following procedure shall be adhered to:
o
remove refrigerant;
o
purge the circuit with inert gas;
o
evacuate;
o
purge with inert gas;
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