Hisense AHW-100HCDS1 Installation Manual page 15

● Charging procedures
- 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 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.
- 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.
- Electrical power must be available before the task is
commenced.
- Become familiar with the equipment and its operation.
- Isolate system electrically.
- Before attempting the procedure, ensure that:
(1) mechanical handling equipment is available, if
required, for handling refrigerant cylinders;
(2) all personal protective equipment is available and
being used correctly;
(3) the recovery process is supervised at all times by a
competent person;
(4) recovery equipment and cylinders conform to the
appropriate standards.
- 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.
● Labeling
- Equipment shall be labeled stating that it has been
decommissioned 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 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 are available. All cylinders to be
used are designated for the recovered refrigerant and
labeled 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 all
appropriate refrigerants.
- 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. Before using the recovery machine, check
that it is in satisfactory working order, has been
properly maintained and that any associated electrical
components are sealed to prevent ignition in the event
of a refrigerant release.
- 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 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 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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GENERAL INFORMATION