Hitachi airCore 700 Operation Installation Maintenance Manual page 8

safety hazard.
•
Maintenance or repair of air conditioner using R32 refrigerant must be carried out after security check
to minimize risk of incidents.
•
Ensure no following objects under the indoor unit:
○ 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
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.
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
transport and installation.
•
Protection devices, piping and fittings shall be protected as far as possible against adverse
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
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
the system.
•
The appliance shall be stored and installed so as to prevent mechanical damage from occurring.
•
Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or
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
being carried out. Work in confined spaces shall be avoided.
•
The area shall be checked with an appropriate refrigerant detector prior to and during work, to 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
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
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
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.
-vi-
fire extinguisher
2