Hitachi AirCore 700 Installation & Maintenance Manual page 7

Precautions for R32
This air conditioner uses R32 flammable refrigerant. Air conditioner with R32 refrigerant, if not be
treated carefully, may cause serious harm to the human body or surrounding things. Please read the
following instructions carefully before installing, using and maintaining.
•
Do not charge R32 into system other than those designated for R32.
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Do not charge R32 system with oil other than those designated for R32.
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Do not use a reclaim cylinder other than an R32 reclaim cylinder.
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Be sure to only use refrigerant piping approved for use with R32 refrigerant. The use of unapproved
piping may result in explosive rupture.
•
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.
•
Maintenance or repair of air conditioner using R32 refrigerant must be carried out after security check
to minimize risk of incidents.
•
Do not use means to accelerate the defrosting process or to clean, other than those recommended by
the manufacturer.
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The appliance shall be stored in a room without continuously operating ignition sources (for example:
open flames, an operating gas appliance or an operating electric heater).
•
The appliance shall be stored in a well-ventilated area where the room size corresponds to the room
area as specified.
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The appliance shall be stored and installed so as to prevent mechanical damage from occurring.
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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.
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There are no potential ignition sources or any equipment that generates sparks around the outdoor unit.
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Do not pierce or burn.
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Be aware that refrigerants might not contain an odour.
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The pipe-work shall be securely mounted and guarded from physical damage.
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The national gas regulations shall also be observed when field-installed refrigerant pipes are required.
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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.
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1. Safety Summary