Midea MP72SQWBA2RCM Owner's Manual page 8

WARNINGS (for using R32 refrigerant only)
6)No ignition sources
No person carrying out work in relation to a refrigeration system which involves
exposing any pipe work that contains or has contained ammable refrigerant shall use
any sources of ignition in such a manner that it may lead to the risk of re or explosion.
All possible ingition sources, including cigarette smoking, should be kept su ciently far
away from the site of installation, repairing, removing and disposal, during which
ammble refrigerant can possibly be released to the surrounding space. Prior to work
taking place, the area around the equipment is to be surveyed to make sure that there
are no ammable hazards or ignition risks. No Smoking signs shall be displayed.
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 chaged, they shall be t for the purpose and
to the correct speci cation. At all times the manufactures'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 ammable refrigerants:
The charge size is in accordance with the room size within which the refrigerant
containing parts are installed;
Theventilation 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:
That 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.
• Repairs to sealed components
1)During repairs to sealed components, all electrical supplies shall be disconnected
from the equipment being worked upon prior to any removal of sealed covers, etc.
If it isabsolutely necessary to have an electrical supply to equipment during
servicing, then a permanently operating form of leak detection shall be located at
the most critical point to warn of a potentially hazardous situation.
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