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presence of a flammable atmosphere. The test appliance must be correctly evaluated.
Replace the components only with the parts specified by the manufacturer. Other
components may cause the ignition of the refrigerant in the atmosphere due to a
leakage.
12) Cables
Check that the cables will not be subjected to wear, corrosion, excessive pressure,
vibrations, sharp edges or other adverse effects on the environment. Verification
should also take into account the effects of the deterioration over time or of the
continuous vibrations from sources such as compressors or fans.
13) Detection of flammable refrigerants
14) Removal and disposal
15) Filling procedures
All manuals and user guides at all-guides.com
Potential sources of ignition should not be used under any circumstances
when searching or detecting refrigerant leakage. Do not use a halogen flash light
(or any other detector using an open flame).
When intervening in the circuit of the refrigerant for repairs - or for any other
purpose - conventional procedures will be used. However, in the case
of refrigerants, it is important to observe the best practices as there is a high risk
of fire. Observe the following procedure:
•
Remove the refrigerant;
•
Purge the circuit with inert gas;
•
Drain;
•
Purge again with inert gas;
•
Open the circuit by cutting or brazing.
The quantity of refrigerant is recovered in the corresponding recovery cylinders.
For the units containing refrigerants, the system must be purged with OFN to
protect the unit. This process may be repeated several times. Do not use
compressed air or oxygen for this procedure. Washing is performed by
forced introduction of OFN (oxygen-free nitrogen) into the system until the
working pressure is reached, followed by venting into the atmosphere
and finally aspiration. This process is repeated until the refrigerant is
evacuated from the system. When the final quantity of OFN is used, the system
must be ventilated at atmospheric pressure to allow works to be carried
out. This operation is absolutely vital if the brazing operations on the pipes
are to be carried out. Ensure that the socket of the vacuum pump is not close to
the open flame sources and that there is ventilation available.
In addition to conventional filling procedures, the following requirements
must be observed:
-
When filling equipment is used ensure that different refrigerants are not
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