Hitachi AirCore 700 Operation Installation Maintenance Manual page 13

(c) the recovery process is supervised at all times by a competent person;
(d) recovery equipment and cylinders conform to the appropriate standards.
○ Pump down refrigerant system, if possible.
○ If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts
of the system.
○ Make sure that the cylinder is situated on the scales before recovery takes place.
○ Start the recovery machine and operate in accordance with instructions.
○ Do not overfill cylinders (no more than 80% volume liquid charge).
○ Do not exceed the maximum working pressure of the cylinder, even temporarily.
○ When the cylinders have been filled correctly and the process completed, make sure that the
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.
•
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.
•
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.
•
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.
•
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.
•
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.
•
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.
•
Disposal of equipment shall follow the national regulations.
•
The storage of the appliance should be in accordance with the applicable regulations or instructions,
whichever is more stringent.
•
The maximum number of pieces of equipment permitted to be stored together notes by each product
package information and standard follows ISO 780-2015.
•
After completing the installation work, check that the refrigerant gas does not leak throughout the
system.
•
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.
•
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.
•
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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1. Safety Summary