Hisense Hi-Therma Serie Manuel D'installation page 14

GENERAL INFORMATION
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.
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 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 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, 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.
3