Panasonic WH-ADC0509L3E5 Operating Instructions Manual

Also see for WH-ADC0509L3E5: Installation manual Service manual

137. The following leak detectionmethods are deemed acceptablefor all refrigerant systems• No leaks shall be detected usingdetection equipment with sensitivityto detect leakage of 5g/year ofrefrigerant or better under a pressureof at least 0.25 times the maximumallowable pressure (>0.98 MPa, max3.90 MPa), for example, a universalsniffer.• Electronic leak detectors maybe used to detect flammablerefrigerants, but the sensitivity maynot be adequate, or may need re-calibration.(Detection equipment shall becalibrated in a refrigerant-free area.)• Ensure that the detector is not apotential source of ignition and issuitable for the refrigerant used.• Leak detection equipment shall beset at a percentage of the LFL of therefrigerant and shall be calibratedto the refrigerant employed and theappropriate percentage of gas (25 %maximum) is confirmed.• Leak detection fluids are alsosuitable for use with mostrefrigerants, for example, bubblemethod and fluorescent methodagents. The use of detergentscontaining chlorine shall be avoidedas the chlorine may react with therefrigerant and corrode the copperpipe-work.• If a leak is suspected, all ignitionsources shall be removed/extinguished.• If a leakage of refrigerant is foundwhich requires brazing, all of therefrigerant shall be recovered fromthe system. The precautions in #8must be followed to remove therefrigerant.8. Removal and evacuation• When breaking into the refrigerantcircuit to make repairs – or forany other purpose – conventionalprocedures shall be used. However,it is important that best practiceis followed since flammability isa consideration. The followingprocedure shall be adhered to:remove refrigerant -> purge thecircuit with inert gas -> evacuate ->purge with inert gas -> open thecircuit by cutting.Brazing must not be used.• The refrigerant charge shall berecovered into the correct recoverycylinders.• The system shall be purged withOFN to render the appliance safe.OFN = oxygen free nitrogen, type ofinert gas.• This process may need to berepeated several times.• Compressed air or oxygen shall notbe used for this task.• Purging shall be achieved bybreaking the vacuum in the systemwith OFN and continuing to fill untilthe working pressure is achieved,then venting to atmosphere, andfinally pulling down to a vacuum.• This process shall be repeated untilno refrigerant is within the system(Until the concentration of purgegas is 0.25 LFL or less by the leakdetector).0.25LFL = 0.525Vol%• When the final OFN charge is used,the system shall be vented down toatmospheric pressure to enable workto take place.• This operation is absolutely vital ifbrazing operations on the pipe workare to take place.