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8
IMPORTANT SAFETY INSTRUCTIONS
12. Charging procedures
In addition to conventional charging
procedures, the following requirements
shall
be
followed.
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
Cylinders shall be kept in an appropriate
position according to the instructions.
Ensure that the refrigeration system is
earthed prior to charging the system with
refrigerant.
Label
charging is complete (if not already).
Extreme care shall be taken not to overfill
the
refrigeration
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.
13. 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
refrigerant
cylinders;
protective equipment is available and
being
used
correctly;
process is supervised at all times by a
competent person; Recovery equipment
and cylinders conform to the appropriate
standards.
d) Pump
down
possible.
Ensure
contained
in
the
system
system.
Prior
required,
for
handling
All
personal
The
recovery
refrigerant
system,
e) If a vacuum is not possible, make a
manifold so that refrigerant can be
removed from various parts of the
system.
that
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.
them.
h) Do not overfill cylinders. (No more than
80% volume liquid charge).
i) Do not exceed the maximum working
pressure
temporarily.
when
j) When the cylinders have been filled
correctly and the process completed,
make sure that the cylinders and the
to
equipment
promptly and all isolation valves on the
equipment are closed off.
k) Recovered
charged into another refrigeration system
unless it has been cleaned and checked.
14. 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.
15. Recovery
When
system,
decommissioning, it is recommended
good practice that all refrigerants are
removed
refrigerant into cylinders, ensure that only
appropriate
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,
if
cooled before recovery occurs.
of
the
cylinder,
are
removed
refrigerant
shall
removing
refrigerant
either
for
safely.
When
refrigerant
even
from
site
not
be
from
a
servicing
or
transferring
recovery
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