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satisfactorily dealt with. If the fault cannot be corrected immediately but it is
necessary to continue operation, an adequate temporary solution shall be used.
This shall be reported to the owner of the equipment so all parties are advised.
Initial safety checks shall include:
•
That capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking.
•
That no live electrical components and wiring are exposed while charging,
recovering or purging the system.
•
Keep continuity of earthing.
Inspection of cable
Check the cable for wear, corrosion, overvoltage, vibration and check if there are
sharp edges and other adverse effects in the surrounding environment. During
the inspection, the impact of aging or the continuous vibration of the compressor
and the fan on it should be taken into consideration.
Leakage check of R290 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 flame) should be used.
For systems with refrigerant R290, 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 fluid 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 fire from the scene or put out the fire.
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 OFN to purify the entire system.
Removal and vacuum pumping
1.
Make sure there is no ignited fire 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
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