Handleiding
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according to the instructions.
prior to charging the system with refrigerant.
Ensure that the refrigerating system is earthed
not already).
nitrogen charge is used, the system shall be vented
down to atmospheric pressure to enable work to
take place. This operation is absolutely vital if brazing
operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not
close to any potential ignition sources and that ven-
tilation is available.
Charging procedures
In addition to conventional charging procedures, the
following requirements shall be followed.
●
Ensure that contamination of different refrigerants
b)
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Isolate system electrically.
Extreme care shall be taken not to overfill the re-
Cylinders shall be kept in an appropriate position
Label the system when charging is complete (if
a)
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.
quired prior to re-use of
recovered refrigerant. It is
essential that electrical power is available before
the task is commenced.
tion.
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c)
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Become familiar with the equipment and its opera-
The refrigerant charge shall be recovered into the
correct tecovery cylinders. For appliances
contain-
ing flammable refrigerants other than A2L refriger-
ants, the system shall be purged with oxygen-free
nitrogen to render the appliance safe for flammable
refrigerants. This process may need to be repeated
several times. Compressed air or oxygen shall not
be used for purging refrigerant systems.
For appliances containing flammable refrigerants,
other than A2L 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.
This process shall be repeated until no refrigerant
is within the system. When the final oxygen-free
quired, for handling refrigerant cylinders;
being used correctly;
–
all personal protective equipment is available and
a competent person;
appropriate standards.
Before attempting the procedure, ensure that:
mechanical handling equipment is available, if re-
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Specialist’s Manual
recovery equipment and cylinders conform to the
the recovery process is supervised at all times by
refrigerant and shall be calibrated to the refrigerant
employed, and the appropriate percentage of gas
(25% maximum) is confirmed.
frigerating system.
Prior to recharging the system, it shall be pres-
sure-tested with the appropriate purging gas. The
system shall be leak-tested on completion of charg-
ing 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 equip-
ment and all its detail. It is recommended good pr-
actice that all refrigerants are recovered safely.
Prior to the task being carried out, an oil and refri-
gerant sample shall be taken in case analysis is re-
following procedure shall be adhered to:
remove refrigerant;
purge the circuit with inert gas (optional for A2L);
evacuate (optional for A2L);
purge with inert gas (optional for A2L);
open the circuit by cutting or brazing.
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Leak detection fluids are also suitable for use with
most refrigerants but the use of detergents contain-
ing chlorine shall be avoided as the chlorine may
react with the refrigerant and corrode the copper
When breaking into the refrigerant circuit to make
repairs -
or for any other purpose - conventional pro-
cedures shall be used. However, for flammable
refrigerants it is important that best practice is
followed since flammability is a consideration. The
pipe-work.
NOTE: Examples of leak detection fluids are
- bubble method,
- fluorescent method agents.
If a leak is suspected, all naked flames shall be re-
moved/extinguished.
If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered from
the system, or isolated (by means of shut off valves)
in a part of the system remote from the leak. Re-
moval of refrigerant shall be according to clause DD.9.
Removal and evacuation
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.
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Productinformatie
| Merk | Gree |
| Model | GIC18UZ |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 5040 MB |
