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The refrigerant charge must be collected in correct recovery bottles. The system must be
drained with oxygen-free nitrogen to make the element safe. This process may have to be
repeated several times. Do not use compressed air or oxygen for this task.
Drainage must be achieved by cutting the vacuum in the system with oxygen-free nitrogen
and continuing to fill until the operating pressure is reached, then venting into the
atmosphere and finally creating the vacuum. This process must be repeated until there is
no refrigerant left in the system. When the final oxygen-free nitrogen charge is used, the
system must be returned to atmospheric pressure to allow operations to proceed. This
operation is absolutely vital if brazing operations are to take place on the pipes.
Make sure that the outlet of the exhaust pump is not close to an ignition source and that
there is ventilation.
- Loading procedures
In addition to conventional loading procedures, the following requirements must be met.
Ensure that no contamination of different refrigerants occurs during the use of the loading
equipment. The pipes or ducts should be as short as possible to minimise the amount of
refrigerant they contain.
The bottles must be kept in an upright position.
Ensure that the refrigeration system is grounded before charging the system with the
refrigerant.
Label the system when loading is complete (if not already done).
Be careful not to allow the refrigeration system to overflow.
Before recharging the system, its pressure must be tested with oxygen-free nitrogen. The
system shall be leak tested at the end of loading but before commissioning. A leak test
must be performed before leaving the site.
- Decommissioning of the appliance
Before performing this procedure, it is essential that the technician is fully familiar with the
equipment in all its details. A good recommended practice is to recover all refrigerants
safely. Before performing this task, an oil and refrigerant sample must be taken in case an
analysis is required before the recovered refrigerant is re-used. It is essential to have
electrical power before starting this task.
a. Become familiar with the equipment and its operation.
b. Electrically isolate the system.
c. Before starting the procedure, ensure that the following is in place:
mechanical handling equipment is available, if necessary, to handle refrigerant bottles;
all personal protective equipment is available and is used correctly;
the recovery process is supervised at all times by a competent person;
the recovery equipment and cylinders meet appropriate standards.
d. Pump the refrigerant system, if possible.
e. If a vacuum is not possible, a collector is made to collect the refrigerant from different
parts of the system.
f. Ensure that the cylinder is located on the scale before recovery begins.
g. Start the recovery machine and operate it in accordance with the manufacturer's
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