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6 • • • • Leak detection equipment should be set at a percentage of the LFL of the refrigerant and should be calibrated to the refrigerant employed and the appropriate percentage of gas (25% maximum) is confirmed. Leak detection fluids are suitable for use with hydrocarbon refrigerants but the use of detergents containing chlorine should be avoided as the chlorine may react with the refrigerant and corrode the copper pipework. Oil additives such as those used in fluorescent leak detection systems will operate with hydrocarbons. If a leak is suspected from a hydrocarbon refrigerant system all naked flames should be removed or extinguished. Breaking into a system and removal of refrigerant When breaking into the refrigerant circuit to make repairs - or for any other purpose – conventional procedures are used. However, it is important that best practice is followed since flammability is now a consideration. The following procedure shall be adhered to: • remove the refrigerant • purge the circuit with inert gas • evacuate • purge again with inert gas • open the circuit by cutting or brazing. The refrigerant charge should be recovered into the correct recovery cylinders. The system is then to be “flushed” with OFN to render the unit safe; this process may need to be repeated several times. Do not use compressed air or oxygen for this task. Flushing is achieved by breaking the vacuum in the system with OFN and continuing to fill until the working pressure is achieved, then venting to the atmosphere, and finally pulling down to a vacuum. This process is repeated until the technician is satisfied that no hydrocarbons are within the system. When the final OFN charge is used, the system can be vented down to atmospheric pressure to enable work to take place. This operation is absolutely vital if brazing operations on the pipe work are to take place. Ensure that the outlet for the vacuum pump is not close to any ignition sources and ventilation is available. If a the means of shut off valves) in a part of the system remote from the leak. Oxygen Free Nitrogen (OFN) should then be purged through the system both before and during the brazing process. leakage of refrigerant is found which requires brazing, all of refrigerant shall be recovered from the system, or isolated (by 135 Safe Refrigerant HandlingPDF Image | Manual for Refrigeration Servicing Technicians
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