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CHARGING PROCEDURES
CAUTION
• In addition to conventional charging procedures, the following requirements shall
be followed.
•
Ensure that contamination of different refrigerants does not occur when using
charging equipment.
•
Hoses or lines shall be as short as possible to minimize the amount of refrigerant
contained in them.
•
Cylinders shall be kept upright.
•
Ensure that the refrigeration system is earthed prior to charging the system with
refrigerant.
•
Label the system when charging is complete (if not already).
•
Extreme care shall be taken not to overfill the refrigeration system.
• Prior to recharging the system, it shall be pressure-tested with the appropriate
purging gas.
• The system shall be leak-tested on completion of charging but prior to
commissioning.
• A follow up leak test shall be carried out prior to leaving the site.
• Electrostatic charge may accumulate and create a hazardous condition when
charging or discharging the refrigerant.
To avoid fire or explosion, dissipate static electricity during transfer by grounding
and bonding containers and equipment before charging / discharging.
DECOMMISSIONING
CAUTION
• Before carrying out this procedure, it is essential that the technician is completely
familiar with the equipment and all its details.
• It is recommended good practice that all refrigerants are recovered safely.
• Prior to the task being carried out, an oil and refrigerant sample shall be taken in
case analysis is required prior to re-use of recovered refrigerant.
• It is essential that electrical power is available before the task is commenced.
a)
Become familiar with the equipment and its operation.
b)
Isolate system electrically.
c)
Before attempting the procedure ensure that:
•
Mechanical handling equipment is available, if required, for handling
refrigerant cylinders.
•
All personal protective equipment is available and being used correctly.
•
The recovery process is supervised at all times by a competent person.
•
Recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed
from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with instructions.
h) Do not overfill cylinders. (No more than 80% volume liquid charge).
00_330344_2WAY_Eng.indb 9 2020/12/21 11:26:34
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) 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.
k) Recovered refrigerant shall not be charged into another refrigerating system
unless it has been cleaned and checked.
• Electrostatic charge may accumulate and create a hazardous condition when
charging or discharging the refrigerant.
To avoid fire or explosion, dissipate static electricity during transfer by grounding
and bonding containers and equipment before charging / discharging.
• Equipment shall be labelled stating that it has been de-commissioned and emptied
of refrigerant.
• The label shall be dated and signed.
• Ensure that there are labels on the equipment stating the equipment contains
flammable refrigerant.
RECOVERY
CAUTION
• When removing refrigerant from a system, either for servicing or decommissioning,
it is recommended good practice 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 are
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
all appropriate refrigerants including, when applicable, flammable refrigerants.
• 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.
• Before using the recovery machine, check that it is in satisfactory working order,
has been properly maintained and that any associated electrical components are
sealed to prevent ignition in the event of a refrigerant release.
Consult manufacturer if in doubt.
• The recovered refrigerant shall be returned to the refrigerant supplier 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.
00_330344_2WAY_Eng.indb 10 2020/12/21 11:26:34
SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 10SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 10 2021/05/07 10:08:292021/05/07 10:08:29
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