Argo APHPDHW200 Use And Installation Manual page 47

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.
Decommissioning
Before carrying out this procedure, it is essential that
the technician is completely familiar with the equipment
and all its details. 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 starting.
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 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 refrigeration 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,
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
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 weighting scales shall
available and in good working order. Hoses shall
be complete with leak-free disconnect couplings and
in good condition. Before
machine, check that it is in satisfactory working
order, has been properly maintained and that any
associated electrical components
prevent ignition in the event of a refrigerant release.
Consult 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 cylinders.
If compressors or compressor oils are to
removed, ensure that they have been evacuated to
an acceptable level to make certain 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.
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