Publicidad
Idiomas disponibles
Idiomas disponibles
inert gas; open the circuit by cutting or soldering. The refrigerant charge must be recovered in
the correct recovery bottles.
The system must be "flushed" with OFN to make the unit safe. It may be necessary to repeat this
process several times. Compressed air or oxygen should not be used for this task. Draining
should be accomplished by breaking the vacuum in the system with OFN and continuing to fill
until operating pressure is reached, then releasing into atmosphere and ultimately pulling
vacuum. This process should be repeated until there is no more refrigerant in the system. When
the last OFN charge is used, the system must be vented to atmospheric pressure to allow work to
be performed. This operation is absolutely vital for brazing work to be carried out on the piping.
8. CHARGING PROCEDURES
In addition to conventional charging procedures, the following requirements must be
observed.
• Make sure that the various refrigerants are not contaminated when using charging equipment.
Pipes or conduits should be as short as possible to minimize the amount of refrigerant they
contain.
• The bottles must be kept upright.
• Make sure the refrigeration system is grounded before charging it with refrigerant.
• Label the system when charging is complete (if not already done).
• Care should be taken not to overfill the refrigeration system.
Before recharging the system, it should be pressure tested with OFN. The system should be
leak tested at the end of charging but before commissioning. A leak test must be carried out
before leaving the site.
9. DECOMMISSIONING
Before performing this procedure, it is essential that the technician is familiar with the equipment
and all of its details. It is recommended, in accordance with good practice, to recover all
refrigerants safely. Before performing the task, an oil and coolant sample should be taken in case
an analysis is required prior to
reuse the recovered refrigerant. It is essential that the power supply is available before the start
of the task.
a) Familiarize yourself with the equipment and its operation.
b) Electrically isolate the system.
c) Before starting the procedure, make sure that: mechanical handling equipment is available, if
necessary, for handling the refrigerant cylinders; all personal protective equipment is available
and used correctly; the recovery process is continuously supervised by a competent person;
recovery equipment and cylinders meet appropriate standards.
d) Pump the refrigerant system, if possible.
e) If vacuum is not possible, create a manifold so that refrigerant can be drained from different
parts of the system.
f) Make sure the bottle is placed on the scale before recovery.
g) Start the recovery machine, then operate according to the manufacturer's instructions.
h) Do not overfill the bottles (no more than 80% of the volume in liquid charge).
i) Do not exceed the maximum operating pressure of the cylinder, even
temporarily.
j) When the cylinders have been properly filled and the process is complete, ensure that the
cylinders and equipment are properly removed from the site and that all equipment isolation valves
are closed.
k) Recovered refrigerant should not be charged into another refrigeration system unless it has
been cleaned and checked.
EN-12
Publicidad
