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render the appliance safe for flammable
refrigerants. This process might need to
be repeated several times. Compressed
air or oxygen shall not be used for
purging
refrigerant
appliances
containing
refrigerants, refrigerants purging shall be
achieved by breaking the vacuum in the
system with oxygen-free nitrogen and
continuing
to
pressure is achieved, then venting to
atmosphere, and finally pulling down to a
vacuum (optional for A2L). This process
shall be repeated until no refrigerant is
within the system (optional for A2L).
When the final oxygen-free nitrogen
charge is used, the system shall be vented
down to atmospheric pressure to enable
work to take place. Ensure that the outlet
for the vacuum pump is not close to any
potential
ignition
ventilation is available.
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.
IMPORTANT SAFETY INSTRUCTIONS
systems.
flammable
fill
until
the
working
sources
and
Ensure
contained
in
them.
the
system
when
system.
Prior
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
For
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,
refrigerant
protective equipment is available and
being
used
process is supervised at all times by a
competent person; Recovery equipment
and cylinders conform to the appropriate
standards.
d) Pump
down
that
possible.
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.
h) Do not overfill cylinders. (No more than
80% volume liquid charge).
i) Do not exceed the maximum working
pressure
temporarily.
j) When the cylinders have been filled
correctly and the process completed,
make sure that the cylinders and the
equipment
to
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.
if
required,
for
cylinders;
All
correctly;
The
refrigerant
system,
of
the
cylinder,
are
removed
from
refrigerant
shall
9
handling
personal
recovery
if
even
site
not
be
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