IM2023
49
7. Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking
into the system or conducting any hot work. A degree of ventilation shall continue
during the period that the work is carried out. The ventilation should safely disperse
any released refrigerant and preferably expel it externally into the atmosphere.
8. Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and
to the correct specification. At all times the manufacturer’s maintenance and service
guidelines shall be followed. If in doubt consult the manufacturer’s technical
department for assistance.
The following checks shall be applied to installations using flammable refrigerants:
– The charge size is in accordance with the room size within which the refrigerant
containing parts are installed;
– The ventilation machinery and outlets are operating adequately and are not
obstructed;
– If an indirect refrigerating circuit is being used, the secondary circuit shall be checked
for the presence of refrigerant;
– Marking to the equipment continues to be visible and legible. Markings and signs that
are illegible shall be corrected;
– refrigeration pipe or components are installed in a position where they are unlikely to
be exposed to any substance which may corrode refrigerant containing components,
unless the components are constructed of materials which are inherently resistant to
being corroded or are suitably protected against being so corroded.
9. Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks
and component inspection procedures. If a fault exists that could compromise safety,
then no electrical supply shall be connected to the circuit until it is satisfactorily dealt
with. If the fault cannot be corrected immediately but it is necessary to continue
operation, an adequate temporary solution shall be used. This shall be reported to the
owner of the equipment so all parties are advised.
Initial safety checks shall include:
-those capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking;
-that there no live electrical components and wiring are exposed while charging,
recovering or purging the system;
-that there is continuity of earth bonding
10. Maintenance of sealed components
It is important to ensure that all power sources are disconnected from the operating
equipment during the maintenance of sealed components, before removing the sealing
covers, etc.
In case of necessity to provide power to the equipment during maintenance, it is
important to provide a permanent leak detection system at the most critical point in
order to warn of a potentially dangerous situation.
Pay particular attention to ensure the impossibility to change/damage/deform the
housing when working with electrical components in such a way as to affect the
protection level, namely: damage to cables, excessive number of connections, non-
compliance of terminals with the original specification, damage to seals, improper
installation of oil seals, etc.
Make sure that the device is installed in a secure manner.
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