45MUAAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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• Works shall be undertaken with appropriate tools only. If uncertain,
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.
• Charging must be performed by liquid charging method.
• Ensure that the refrigeration system is grounded prior to charging the
system with refrigerant.
• Label the system when charging is complete.
• Extreme care shall be taken to avoid overfilling 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 before 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 the following:
• 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. Ensure the 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. Never exceed the maximum working pressure of the cylinder.
j. When the cylinders have been filled correctly and the process
complete, 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 decommissioned
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-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.
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.
Table 2 — Symbols on the indoor unit or outdoor unit
WARNING
This symbol shows that this appli-
ance used a flammable refrigerant. If
the refrigerant is leaked and
exposed to an external ignition
source, there is a risk of fire.
CAUTION
This symbol shows that the opera-
tion manual should be read carefully.
CAUTION
This symbol shows that a service
personnel should be handling this
equipment with reference to the
installation manual.
CAUTION
CAUTION
This symbol shows that information
is available such as the operating
manual or installation manual.
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