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1.GENERAL INFORMATION
Prior to recharging the system it shall be pressure
tested with OFN. 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.
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 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.
Recovery:
When removing refrigerant from a system, either
for servicing or decommissioning, it is recom-
mended 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 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. 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.
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