Hitachi AirCore 700 Operation Installation Maintenance Manual page 10

1. Safety Summary
required.
•
Field-made refrigerant joints indoors shall be tightness tested. The test method shall have a
sensitivity of 5 grams per year of refrigerant or better under a pressure of at least 0,25 times the
maximum allowable pressure. No leak shall be detected; Mechanical connections shall be accessible
for maintenance purposes.
•
The joints shall not be reused, unless after re-flaring the pipe.
•
Joints made in the installation between parts of the refrigerating system, with outdoor part charged,
shall be made in accordance with the following.
○ A brazed, welded, or mechanical connection shall be made before opening the valves to permit
refrigerant to flow between the refrigerating system parts. A vacuum valve shall be provided to
evacuate the interconnecting pipe and/or any uncharged refrigerating system part.
○ Mechanical connectors used indoors shall comply with ISO 14903. When mechanical connectors are
reused indoors, sealing parts shall be renewed. When flared joints are reused indoors, the flare part
shall be re-fabricated.
○ Refrigerant tubing shall be protected or enclosed to avoid damage.
•
That after completion of field piping for split systems, the field pipework shall be pressure tested
with an inert gas and then vacuum tested prior to refrigerant charging, according to the following
requirements:
○ The minimum test pressure for the low side of the system shall be the low side design pressure and
the minimum test pressure for the high side of the system shall be the high side design pressure,
unless the high side of the system, cannot be isolated from the low side of the system in which case
the entire system shall be pressure tested to the low side design pressure.
•
The appliance shall be stored in a well-ventilated area where the room size corresponds to the room
area as specified.
•
The appliances are designed for use at altitudes less than 2000m, may cause serious harm to the
human body or surrounding things if used at altitudes 2000m and above.
•
Keep any required ventilation openings clear of obstruction, don't block air inlet or air outlet,
Otherwise, the cooling or heating capacity will be weakened, even cause system stop operating or
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
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