INVENTOR CLCO290-09 Manual De Usuario página 8

|Warnings (for using R290/R32 refrigerant only)
in order to make any repairs or for any other
purposes, conventional procedures should be
applied. However, it is strongly suggested that
safe practice is followed, and flammability
should be taken under consideration.
The following procedure should be followed
as to:
Remove refrigerant,
Purge the circuit with inert
gas, Evacuate,
Purge again with inert gas,
Open the circuit by performing a cut or brazing.
The refrigerant charge should be recovered into
the assigned and correct recovery cylinders, The
system must be flushed with OFN to render the
unit safe, This process may be repeated several
times. The use of Compressed air oxygen may
not be used for this act. Flushing may be
achieved by breaking the vacuum in the system
with OFN and continuing to fill until the working
pressure has been achieved, then venting to
atmosphere, and finally pulling down to a
vacuum. This process should be repeated until
no refrigerant is left within the system. When the
final OFN charge is used, the system shall be
vented down to atmospheric pressure to enable
any work to be performed. This operation is
absolutely crucial if brazing operations on the
pipe-work are intended to take place.
Ensure that the outlet for the vacuum pump
is not close to any ignition sources and there
is plenty of ventilation available
13. Charging procedures
In addition to conventional charging
procedures, the following requirements
should be followed.
Ensure that the contamination of different
refrigerants does not occur when using
charging equipment. Hoses or lines shall be
as short as possible to minimise t he amount
of refrigerant contained in them.
Cylinders shall be kept in an upright
position. Ensure that the refrigeration
system is earthed prior to charging the
system with any refrigerant.
Label the system when charging is complete
(if not labeled already).
Extreme care mustl be taken not to overfill
the refrigeration system. Prior to recharging
the system, it must be pressure tested with
8
OFN. The system must also be leak tested on
completion of charging but prior to
commissioning. A follow up leak test should
be carried out prior to leaving the site.
14. Decommissioning
Before carrying out this procedure, it is essential
that the technician is completely familiar with the
equipment and all its details. It is considered as
good practice that all refrigerants are recovered
safely. Prior to the task being carried out, an oil
and refrigerant sample shall be taken, in the
event that analysis is required prior to re-use of
reclaimed refrigerant. It is essential that
electrical power is available before the task is
commenced.
a)Become familiar with the equipment and
its operation.
b) Electrically isolate the system.
c)Before attempting this procedure please
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 manufacturer's 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
charged into another refrigeration system
unless it has been cleaned and checked.
15.Labelling
Equipment must be labelled stating that it
has been
shall not be
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