LG Multi F Manuel D'installation Et D'utilisation page 7

Charging procedures
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 minimise the amount of refrigerant contained in
them.
- Cylinders shall be kept in an appropriate position according to the
instruction.
- Ensure that the refrigerating 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 refrigerating
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.
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
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).
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.
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.
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 is 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 the flammable refrigerant.
If in doubt, the manufacturer should be consulted. 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.
The recovered refrigerant shall be processed according to local
legislation 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 compressor 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 compressor body shall not be heated by an open flame or
other ignition sources to accelerate this process.
When oil is drained from a system, it shall be carried out safely.
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