Saneo JHS-A020-12KR2/B Manual De Usuario página 43

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 instructions.
h. Do not allow the bottles to overflow. (Not more than 80% of liquid charge by volume).
i. Do not exceed the maximum working 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 removed from the site quickly and that all equipment isolation valves are closed.
k. The recovered refrigerant must not be loaded into another refrigeration system unless it has been cleaned and
checked.
- Labelling
A label must be affixed to the equipment indicating that it has been taken out of service and drained of its refrigerant.
This label must be dated and signed. Ensure that there are labels on equipment indicating that it contains flammable
refrigerants.
- Recuperation
When draining a system of its refrigerant for service or shutdown operations, it is recommended good practice to
safely remove all refrigerants.