1. Before use
8
8
13.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
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 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.
If a vacuum is not possible, make a manifold so that refrigerant can be removed from various
parts of the system.
Make sure that cylinder is situated on the scales before recovery takes place.
Start the recovery machine and operate in accordance with manufacturer’s instructions.
Do not overfill cylinders. (No more than 80
%
volume liquid charge).
Do not exceed the maximum working pressure of the cylinder, even temporarily.
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.
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 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
.
.
.
e)
f)
g)
h)
I)
j)
k)
