6-8.General Safety Precautions For Using R32 Refrigerant; 6-8-1.Recovery; 6-8-2.Decommissioning; 6-8-3.Labelling - Toshiba HWT-601XWHM3W-ETR Service Manual

6-8. General safety precautions for using R32 refrigerant
6-8-1. Recovery
• 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 mildly 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 recovery machine check that it is
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 mildly
flammable refrigerant does not remain within the
lubricant.
• The evacuation process shall be carried out prior to
returning the compressor to the suppliers.
• Only electric heating to the compressor body shall be
employed to accelerate this process.
• When oil is drained from a system, it shall be carried
out safely.
6-8-2. Decommissioning
• Before carrying out this procedure, it is essential that
the technician is completely familiar with the
equipment and all its details. Only a qualified installer
(*1) or qualified service person (*1) is allowed to do
this work.
• 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 reclaimed refrigerant.
• It is essential that electrical power is available before
the task is commenced.
NOTE
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 the 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
manufacturers instructions.
h) Do not overfill cylinders (No more than 80% volume liquid
change).
i) Do not exceed the maximum working pressure of the cylinder,
even temporarily.
j) When the cylinders have been filled correctly and the process
complete, make sure that the cylinders and the equipment are
removed from site promptly and all isolation valves on
equipment are closed off.
k) Recovered refrigerant shall not be changed into another
refrigerant system unless it has been cleaned and checked.
(*1) Refer to the "Definition of qualified installer or qualified service
person".
6-8-3. Labelling
• Equipment shall be labelled stating that it has been
de-commissioned and emptied of refrigerant.
• The label shall be dated and signed.
• Ensure that are labels on the equipment stating the
equipment contains mildly flammable refrigerant.
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