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KDH4756
dehumidifier
EN
• 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 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.
14. Decommissioning
Before carrying out this procedure, it is essential that the technician
be 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 the cylinders (no more than 80 % of the 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 the cylinders and the equipment are removed
from the 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.
15. 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 there are labels on the equipment stating the equipment
contains flammable refrigerant.
16. Recovery
• When removing refrigerant from a system, either for service
or decommissioning, it is recommended good practice that all
refrigerants be removed safely.
• When transferring refrigerant into cylinders, ensure that only
appropriate refrigerant recovery cylinders are used. Ensure that
the correct numbers 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 the
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 the cylinders.
• If compressors or compressor oils are to be removed, ensure that
they have been evacuated to an acceptable level to make sure
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.
