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Installer's Guide
This process might need to be repeated several times.
Compressed air or oxygen shall not be used for purging
refrigerant systems.
For appliances containing flammable refrigerants, refrigerants
purging shall be achieved by breaking the vacuum in the
system with oxygen-free nitrogen and continuing to fill until
the working 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.
The outlet for the vacuum pump shall not be close to any
potential ignition sources, and ventilation shall be available.
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 in an appropriate position
according to the instructions.
•
Ensure that the refrigerating 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 refrigerating
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.
See installation instructions below for further details.
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 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 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 the flammable
refrigerant. If in doubt, the manufacturer should be consulted.
In addition, 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.
4
The recovered refrigerant shall be processed according
to local legislation 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 compressor body shall not be heated by an
open flame or other ignition sources to accelerate this process.
When oil is drained from a system, it shall be carried out safely.
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 recovered refrigerant. It is essential that
electrical power is available before the task is commenced.
1.
Become familiar with the equipment and its operation.
2.
Isolate system electrically.
3.
Before attempting the procedure, ensure that:
a.
Mechanical handling equipment is available, if
required, for handling refrigerant cylinders;
b.
All personal protective equipment is available and
being used correctly;
c.
The recovery process is supervised at all times
by a competent person;
d.
Recovery equipment and cylinders conform to
the appropriate standards.
4.
Pump down refrigerant system, if possible.
5.
If a vacuum is not possible, make a manifold so that
refrigerant can be removed from various parts of the
system.
6.
Make sure that cylinder is situated on the scales before
recovery takes place.
7.
Start the recovery machine and operate in accordance
with instructions.
8.
Do not overfill cylinders (no more than 80 % volume liquid
charge).
9.
Do not exceed the maximum working pressure of the
cylinder, even temporarily.
10. 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.
11. Recovered refrigerant shall not be charged into another
refrigerating system unless it has been cleaned and
checked.
Equipment shall be labelled stating that it has been
decommissioned and emptied of refrigerant. The label shall
be dated and signed. For appliances containing flammable
refrigerant, ensure that there are labels on the equipment
stating the equipment contains flammable refrigerant.
18-AD47D1-1B-EN
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