Hitachi AirCore 700 Operation Installation Maintenance Manual page 11
Single split inverter series indoor unit
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Also See for AirCore 700:
- Operation installation maintenance manual (40 pages) ,
- Installation & maintenance manual (28 pages) ,
- Installation & maintenance manual (52 pages)
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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
extinguisher 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.
•
Anti-static precautions is necessary for installing and maintenance, for example, wear pure cotton
clothes and gloves.
•
If R32 refrigerant leakage occurs during the installation, operators shall immediately detect
the 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
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, inflammable 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.
•
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 no live electrical components and wiring are exposed while charging, recovering or purging the
system.
○ that there is continuity of earth bonding.
•
Sealed electrical components shall not be repaired.
•
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check shall also take into account the effects of
-6-
1. Safety Summary
fire
2
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