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Ensure no following objects under the indoor unit:
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○ Microwaves, ovens and other hot objects.
○ Computers and other high electrostatic appliances.
○ Sockets that plug frequently.
Installation, maintenance, service, repairing, removing and disposal operations, shall only be
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performed by the qualified personnel or recommended by the manufacturer.
Every working procedure that affects safety means shall only be carried out by competent persons.
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Examples for such working procedures are:
○ breaking into the refrigerating circuit;
○ opening of sealed components;
○ opening of ventilated enclosures.
Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping for the
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transport and installation.
Protection devices, piping and fittings shall be protected as far as possible against adverse
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environmental effects, for example the danger of water collecting and freezing in relief pipes or the
accumulation of dirt and debris.
When installing or repairing the air conditioner and the connecting line is not long enough, the entire
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connecting line shall be replaced with the connecting line of the original specification; extension is not
allowed.
Refrigerating systems shall be so installed as to minimize the likelihood of hydraulic shock damaging
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the system.
The appliance shall be stored and installed so as to prevent mechanical damage from occurring.
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Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or
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vapour being present while the work is being performed.
All maintenance staff and others working in the local area shall be instructed on the nature of work
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being carried out. Work in confined spaces shall be avoided.
The area shall be checked with an appropriate refrigerant leak sensor prior to and during work, to
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ensure the non-existence of potentially toxic or flammable atmospheres. Ensure that the leak detection
equipment being used is suitable for use with all applicable refrigerants, i.e. nonsparking, adequately
sealed or intrinsically safe.
If any hot work is to be conducted on the refrigerating equipment or any associated parts, appropriate
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fire extinguishing equipment shall be available to hand. Have a dry powder or CO
adjacent to the charging area.
No person carrying out work in relation to a refrigerating system which involves exposing any pipe work
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shall use any sources of ignition in such a manner that it can lead to the risk of fire or explosion. All
possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site
of installation, repairing, removing and disposal, during which 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 flammable hazards or ignition risks. "No Smoking" signs shall be displayed.
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system
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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.
Anti-static precautions is necessary for installing and maintenance, for example, wear pure cotton
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clothes and gloves.
If R32 refrigerant leakage occurs during the installation, operators shall immediately detect the
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concentration in indoor environment until it reaches a safe level. If the leakage affects the performance
of the machine, please immediately stop the operation, and the air conditioner must be vacuumed
firstly and be returned to the maintenance station for processing.
Where electrical components are being changed, they shall be fit for the purpose and to the correct
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-vi-
fire extinguisher
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