Refrigerant Charging Procedures
Scrapping and Recovery
Recovery
11
The following requirements are added as the supplementation of conventional procedures:
During the use of refrigerant charging tools, cross contamination of different refrigerants shall be avoided. The total length
(including the refrigerant pipelines) shall be shortened as much as possible, to reduce the residual of refrigerant inside;
The cylinders of refrigerant shall be kept upright;
Before refrigerant charging, the refrigeration system shall be earthed;
A label must be pasted on the refrigeration system after refrigerant charging;
Excessive charging is not allowed; the refrigerant shall be charged slowly;
In case system leakage is identified, refrigerant charging is not allowed unless the leak point is repaired;
During refrigerant charging, the charging amount shall be measured with an electronic scale or a spring scale. The connecting
hose between the refrigerant cylinder and the charging equipment shall be relaxed appropriately, to avoid impact on the
measuring accuracy due to stress.
Requirements on storage site of refrigerant
The cylinder of refrigerant shall be placed in a -10~50
environment with favorable ventilation, and warning labels shall be
pasted;
The maintenance tool in contact with the refrigerant shall be stored and used separately, and the maintenance tool of
different refrigerants cannot be mixed.
Scrapping
Before scrapping, the technician shall be completely familiar with the equipment and all its features. The safe recovery of
refrigerant is recommended. In case the refrigerant recovered needs to be reused, before which the sample of refrigerant and
oil shall be analyzed.
(1) The equipment and operation shall be well known;
(2) Power supply shall be switched off;
(3) The followings shall be guaranteed before scrapping:
The mechanical equipment shall be convenient for operation on the cylinder of refrigerant (if necessary);
All personal protective equipment is available and being used correctly;
The whole course of recovery shall be guided by qualified personnel;
The recovery equipment and cylinders shall be in line with corresponding standards.
(4) The refrigeration system shall be vacuumized if possible;
(5) In case the vacuum state cannot be reached, vacuumizing shall be carried out from numerous positions, to pump the
refrigerant in each part of the system out;
(6) It shall be guaranteed that the capacity of cylinders is sufficient before recovery;
(7) The recovery equipment shall be started and operated as per the operation instructions of the manufacturer;
(8) The cylinder cannot be charged too full. (The refrigerant charged cannot exceed 80% of the capacity of cylinders)
(9) The maximum operating pressure of cylinders cannot be surpassed even only lasting for a short term;
(10) After refrigerant recovery is completed, the cylinder and equipment must be evacuated rapidly, and all the stop valves on
the equipment must be closed;
(11) Before purification and tests, the refrigerant recovered cannot be charged into another refrigeration system.
Note:
The air conditioner shall be marked (with dates and signature) after being scrapped and the refrigerant is discharged.
It shall be guaranteed that the sign on the air conditioner can reflect the flammable refrigerant charged inside.
During maintenance or scrapping, the refrigerant inside the refrigeration system needs to be cleared. It is recommended
that the refrigerant be cleared thoroughly.
The refrigerant can only be charged into a dedicated cylinder, the capacity of which shall match with the refrigerant amount
charged in the whole refrigeration system. All cylinders to be used are designated for the recovered refrigerant and labeled for
that refrigerant (Dedicated Cylinder for Refrigerant Recovery). The cylinders shall be equipped with pressure relief valves and
stop valves under favorable state. The empty cylinder shall be vacuumized before usage and be kept under normal temperature.
The recovery equipment shall always be under favorable working state, and be equipped with operation instructions, to
facilitate information search. The recovery equipment shall be applicable to the recovery of flammable refrigerant. Moreover,
weighing apparatus under available state with measurement certificates shall be equipped. In addition, removable attachment
joints free from leakage shall be used as the hose, and shall always be under favorable state. Whether the recovery equipment
is under favorable state and is properly maintained and whether all the electrical components are sealed shall be checked
before usage, to avoid fire or explosion in case of refrigerant leakage. If you have any question, please consult the manufacturer.
The refrigerant recovered shall be delivered back to the manufacturer in appropriate cylinders, with transporting instructions
being attached. Mixing of refrigerant in recovery equipment (especially the cylinders) is not allowed.
During transporting, the space in which the flammable refrigerant air conditioners are loaded cannot be sealed. Anti-
static measures shall be taken for the transporting vehicles. Meanwhile, during the transporting, loading and unloading of air
conditioners, necessary protective measures shall be taken, to protect the air conditioner from being damaged.
During removal of the compressor or clearing of the compressor oil, it shall be guaranteed that the compressor is
vacuumized to a proper level, to ensure no residual flammable refrigerant is left inside the lubricating oil. The vacuumizing
shall be completed before the compressor is delivered back to the manufacturer. The vacuumizing can only be accelerated by
heating the compressor housing through electrical heating. Safety shall be guaranteed when the oil is discharged from the
system.disassembled with a pipe cutter, and the disassembly must be carried out around a ventilation opening
