Aiwa ACD-24KBTU Gebrauchsanweisung, Installationsanleitung Seite 16

The refrigerant charge shall be recovered into
the correct recovery cylinders. The system shall
be flushed with OFN to render the unit safe. This
process may need to be repeated several times.
Compressed air or oxygen shall not be used for this
task.
Flushing shall be achieved by breaking the vacuum
in the system with OFN and continuing to fill until
the working pressure is achieved, then venting
to atmosphere, and finally pulling down to a
vacuum. This process shall be repeated until no
refrigerant is within the system. When the final OFN
charge is used, the system shall be vented down
to atmospheric pressure to enable work to take
place. This operation is absolutely vital if brazing
operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not
close to any ignition sources and there is ventilation
available.
23. Decommissioning
Before carrying out this procedure, it is essential
that the technician is completely familiar with the
equipment and all its detail. 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.
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 the cylinder is situated on the
scales before recovery takes place.
g) Start the recovery machine and operate in
accordance with manufacturer's instructions.
h) Do not overfill cylinders. (No more than 80 %
volume liquid charge).
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 refrigeration system unless it has been
cleaned and checked.
16 ACD-24KBTU
24. Labeling
Equipment shall be labeled 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.
25. 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 labeled 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 recover 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 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.