Hitachi AirCore 700 Installation & Maintenance Manual page 9

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The maximum number of pieces of equipment or the configuration of the equipment permitted to be
transported together will be determined by the applicable local transport regulations.
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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.
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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.
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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.
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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 CO2 fire extinguisher
adjacent to the charging area.
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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.
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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.
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Anti-static precautions is necessary for installing and maintenance, for example, wear pure cotton
clothes and gloves.
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If R32 refrigerant leakage occurs during the installation, operators shall immediately detect the
concentration in outdoor 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.
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Where electrical components are being changed, they shall be fit for the purpose and to the correct
specification. At all times the maintenance and service guidelines of this manual shall be followed. If in
doubt, consult the manufacturer's technical department for assistance. The following checks shall be
applied to installations using R32:
○ The refrigerant charge is in accordance with the room size within which the refrigerant containing
parts are installed;
○ The ventilation machinery and inlets and outlets are operating adequately and are not obstructed;
and shall keep away from heat source, flammable or explosive conditions;
○ Marking to the equipment continues to be visible and legible. Markings and signs that are illegible
shall be corrected;
○ Refrigerating pipe or components are installed in a position where they are unlikely to be exposed
to any substance which can 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.
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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
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1. Safety Summary