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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.
10. LABELING
Equipment should be labeled with a label indicating that it has been removed from service and
emptied of refrigerant. The label must be dated and signed. Make sure the equipment has
labels indicating that the equipment contains flammable refrigerant.
11. RECOVERY
When emptying refrigerant from a system, whether for repair work or decommissioning, it is
recommended that all refrigerants be drained safely. When transferring refrigerant into
cylinders, be sure to use only suitable refrigerant recovery cylinders.
Make sure that the correct number of cylinders to hold the total system charge are
available. All cylinders to be used are designated for the recovered refrigerant and labeled
for that refrigerant (i.e. special cylinders for the recovery of refrigerant).
Cylinders must be fitted with a pressure relief valve and associated shut-off valves in good
working order. Empty recovery bottles are disposed of and, if possible, cooled before recovery.
Recovery equipment should be in good working order with a set of equipment instructions
available and should be suitable for the recovery of flammable refrigerants.
In addition, a set of calibrated scales must be available and in good working order. Hoses
must be complete with disconnected fittings without leaks and in good condition. Before
using the recovery machine, make sure that it is in good working order, properly
maintained, and that all associated electrical components are sealed to prevent ignition if
refrigerant is released. Consult the manufacturer if in doubt.
The recovered refrigerant should be returned to the refrigerant supplier in the appropriate
recovery cylinder, and the corresponding waste transfer ticket should be prepared. Do not
mix refrigerants in the recovery units and in particular in the bottles. If compressors or
compressor oils need to be disposed of, make sure they have been vented to an acceptable
level to ensure that flammable refrigerant does not remain in the lubricant. The evacuation
process should be done before returning the compressor to the suppliers. Only an electric
heater of the compressor body should be used to speed up this process. When oil is drained
from a system, it should be done safely.
ii)
COMPETENCE OF SERVICE STAFF
→ General
Special training, in addition to normal refrigeration equipment repair procedures, is
required when equipment containing flammable refrigerants is affected.
In many countries, this training is provided by national training organizations accredited to
teach relevant national skill standards that may be defined in legislation. The skills acquired
must be documented by a certificate.
→ Training
The training should include the following:
• Information on the explosion potential of flammable refrigerants indicating that
flammable products can be dangerous when handled carelessly.
• Information on potential ignition sources, especially those that are not obvious,
including lighters, light switches, vacuum cleaners, electric heaters.
• Information on the various security concepts:
- Lack of ventilation (see clause GG.2): The safety of the device does not depend on
ventilation of the housing. Switching off the device or opening the housing has no
significant effect on safety. However, it is possible for leaking refrigerant to accumulate
inside the housing and a flammable atmosphere will be evolved when opening the housing.
− Ventilated housing (see Clause GG.4): The safety of the device depends on the
ventilation of the housing. Switching off the device or opening the case has a significant
impact on safety. Precautions should be taken to ensure sufficient ventilation
beforehand.
− Ventilated room (see clause GG.5): The safety of the appliance depends on the ventilation
of the room. Switching off the device or opening the housing has no significant effect on
safety. Room ventilation should not be stopped during repair procedures.
• Information on the concept of sealed components and housings in accordance with IEC
60079-15: 2010.
→ Information on the correct procedures for carrying out the work:
a) Commissioning
• Make sure that the floor area is sufficient for the refrigerant charge or that the ventilation
duct is correctly mounted.
EN-11
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