Hitachi airCore 700 Operation Installation Maintenance Manual page 11

cylinders and the equipment are removed from site promptly and all isolation valves on the
equipment are closed off.
○ Recovered refrigerant shall not be charged into another refrigerating system unless it has been
cleaned and checked.
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Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The
label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are
labels on the equipment stating the equipment contains flammable refrigerant.
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When removing refrigerant from a system, either for servicing or decommissioning, it is required to
follow good practice so that all refrigerants are removed safely.
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When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders
are employed. Ensure that the correct number of cylinders for holding the total system charge is
available. All cylinders to be used are designated for the recovered refrigerant and labelled for that
refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with
pressure-relief valve and associated shut-off valves in good working order. Empty recovery cylinders are
evacuated and, if possible, cooled before recovery occurs.
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The recovery equipment shall be in good working order with a set of instructions concerning the
equipment that is at hand and shall be suitable for the recovery of the flammable refrigerant. Consult
manufacturer if in doubt. In addition, a set of calibrated weighing scales shall be available and in good
working order. Hoses shall be complete with leak-free disconnect couplings and in good condition.
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The recovered refrigerant shall be processed according to local legislation in the correct recovery
cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and
especially not in cylinders.
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If compressors or compressor oils are to be removed, ensure that they have been evacuated to an
acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The
compressor body shall not be heated by an open flame or other ignition sources to accelerate this
process. Draining of oil from a system shall be carried out safely.
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Disposal of equipment shall follow the national regulations.
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The storage of the appliance should be in accordance with the applicable regulations or instructions,
whichever is more stringent.
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The maximum number of pieces of equipment permitted to be stored together notes by each product
package information and standard following ISO 780-2015.
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After completing the installation work, check that the refrigerant gas does not leak throughout the system.
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When installing the unit in a small room, take measures to keep the refrigerant concentration from
exceeding allowable safety limits. Excessive refrigerant leaks, in the event of an accident in a closed
ambient space, can lead to oxygen deficiency.
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When installing or relocating the air conditioner, do not let any other substances besides R32, such as
air, enter the refrigerant circuit. The presence of air or foreign matter in the refrigerant circuit causes an
abnormal pressure rise, which may result in equipment damage and even injury.
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Refrigerant R32 in the system must be kept clean, dry, and tight.
○ Clean and Dry -- Foreign materials (including mineral oils such as SUNISO oil or moisture) should be
prevented from getting into the system.
○ Tight -- R32 does not contain any chlorine, does not destroy the ozone layer, and does not reduce the
earth's protection again harmful ultraviolet radiation. R32 can contribute to the greenhouse effect if
it is released.
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Only use tools for R32, such as a gauge manifold, charge hose, gas leak detector, reverse flow check
valve, refrigerant charge base, vacuum gauge, or refrigerant recovery equipment.
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