GRE HPGI50 Manuel D'instructions page 8

purge with an inert gas (optional for A2L);
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open the circuit by cutting or soldering.
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The refrigerant charge must be recovered in suitable recovery cylinders. For appliances containing flammable
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refrigerants other than A2L refrigerants, the system must be bled with nitrogen devoid of oxygen to make the
appliance suitable for receiving flammable refrigerants. You may need to repeat this process several times.
Compressed air or oxygen must not be used to purge cooling systems.
Loading procedures
Check that the vacuum pump outlet is not located in the vicinity of any potential ignition source and that
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ventilation is provided.
In addition to conventional charging procedures, the following requirements apply.
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Check that there is no possibility of cross-contamination between the different refrigerants when using charging
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equipment. Hoses or lines must be as short as possible to reduce the quantity of refrigerant contained therein.
Cylinders must be kept in an appropriate position, in accordance with the instructions.
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Check that the cooling system is grounded before charging the system with refrigerant.
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Label the system once charging is complete (if this is not already the case).
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Pay close attention to not overfilling the cooling system.
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Before recharging the system, carry out a pressure test using a suitable purge gas. The system must be examined
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to make sure there are no leaks after the charging operation and before commissioning. A follow-up leak test
must be carried out before leaving the site.
Dismantling
Before dismantling, the technician must familiarise himself/herself with the equipment and its specifications. We
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highly recommend carefully recovering all refrigerants. Before this, oil and refrigerant samples must be taken if
analyses are to be carried out before any other use of the recovered refrigerant. Check for the presence of a
power supply before starting work.
1. Familiarise yourself with the equipment and how it operates.
2. Electrically isolate the system.
3. Before starting work, check the following points:
mechanical handling equipment is available if needed to handle the refrigerant cylinders;
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all personal protective equipment is available and used correctly;
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the recovery process is followed at all times by a cognizant person;
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the recovery cylinders and equipment comply with the relevant standards.
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4. Drain the cooling system where possible.
5. If a vacuum cannot be created, install a manifold in order to be able to remove the refrigerant from various
locations within the system.
6. Make sure that the cylinder is located on the scales before starting recovery operations.
7. Start the recovery unit and operate as per its instructions.
8. Do not overfill the cylinders (no more than 80% of the volume must be filled with liquid).
9. Do not exceed the maximum working pressure of the cylinder, even temporarily.
10. When the cylinders have been filled correctly and the process is complete, check that the cylinders and the
equipment are quickly removed from the site and that the alternative shut-off valves on the equipment are
closed.
11. The recovered refrigerant must not be charged in another cooling system, unless it has been cleaned and
inspected.
TROUBLESHOOTING
All brazing must be carried out by qualified brazers.
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Replacement pipes must always be made of copper in compliance with standard NF EN 12735-1.
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Leak detection; pressure test:
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 never use oxygen or dry air, risk of fire or explosion,
 use dry nitrogen or the mixture of nitrogen and refrigerant indicated on the information plate,
 the test pressure for both the high and low pressure circuits must not exceed 42 bar in cases where
the appliance is equipped with the optional pressure gauge.
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