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LEAKAGE CHECK OF R32 REFRIGERANT
Note: Check the leakage of the refrigerant in an environment where there is no
potential ignition source. No halogen probe (or any other detector that uses an
open fl ame) should be used.
Leak detection method:
For systems with refrigerant R32, electronic leak detection instrument is
available to detect and leak detection should not be conducted in environment
with refrigerant. Make sure the leak detector will not become a potential source
of ignition, and is applicable to the measured refrigerant. Leak detector shall be
set for the minimum ignitable fuel concentration (percentage) of the refrigerant.
Calibrate and adjust to proper gas concentration (no more than 25%) with
the used refrigerant. The fl uid used in leak detection is applicable to most
refrigerants. But do not use chloride solvents to prevent the reaction between
chlorine and refrigerants and the corrosion of copper pipeline. If you suspect a
leak, then remove all the fi re from the scene or put out the fi re.
If the location of the leak needs to be welded, then all refrigerants need to
be recovered, or, isolate all refrigerants away from the leak site (using cut-off
valve). Before and during the welding, use OFF to purify the entire system.
REMOVAL AND VACUUM PUMPING
1. Make sure there is no ignited fi re source near the outlet of the vacuum
pump and the ventilation is well.
2. Allow the maintenance and other operations of the refrigeration circuit
should be carried out according to the general procedure, but the following
best operations that the fl ammability is already taken into consideration are
the key. You should follow the following procedures:
•
Remove the refrigerant.
•
Decontaminate the pipeline by inert gases.
•
Evacuation.
•
Decontaminate the pipeline by inert gases again.
•
Cut or weld the pipeline.
3. The refrigerant should be returned to the appropriate storage tank. The
system should be blown with oxygen free nitrogen to ensure safety. This
process may need to be repeated for several times. This operation shall
not be carried out using compressed air or oxygen.
4. Through blowing process, the system is charged into the anaerobic nitrogen
to reach the working pressure under the vacuum state, then the oxygen
free nitrogen is emitted to the atmosphere, and in the end, vacuumize the
system. Repeat this process until all refrigerants in the system is cleared.
89
GB
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