37MARAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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15. Charging procedures
In addition to conventional charging procedures, the following
requirements shall be followed:
• Works shall be undertaken with appropriate tools only (In case of
uncertainty, please consult the manufacturer of the tools for use with
flammable refrigerants)
• Ensure that contamination of different refrigerants does not occur
when using charging equipment. Hoses or lines shall be as short as
possible to minimize 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 oxygen
free nitrogen (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
.
16. 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.
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
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.
17. Labeling
Equipment shall be labeled stating that it has been de-commissioned and
emptied of refrigerant. The label shall be dated and signed. For appliances
containing FLAMMABLE REFRIGERANTS, ensure that there are labels
on the equipment stating the equipment contains FLAMMABLE
REFRIGERANT.
18. 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
labeled for that refrigerant (i. e. special cylinders for the recovery of
refrigerant). Cylinders shall be complete with pressure-relief valve and
associated shut-o 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.
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.
19. Transportation, marking and storage for units
a. Transport of equipment containing flammable refrigerants
Compliance with the transport regulations
b. Marking of equipment using signs/Compliance with local
regulations
c. Disposal of equipment using flammable refrigerants/
Compliance with national regulations
d. Storage of equipment/appliances/The storage of equipment
should be in accordance with the manufacturer’s instructions.
e. Storage of packed (unsold) equipment/Storage package
protection should be constructed such that mechanical damage
to the equipment inside the package will not cause a leak of the
refrigerant charge. The maximum number of pieces of
equipment permitted to be stored together will be determined
by local regulations.
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