Panasonic CS-KS30NKU Technical & Service Manual

Contents

Panasonic CS-KS30NKU Technical & Service Manual Manual pdf 53 page image

Length of tubingEvacuation timeLess than 33 ft. (10 m)More than 10 minutesMore than 33 ft. (10 m)More than 15 minutes10-6. In Case Refrigerant is LeakingCAUTION Never attempt to charge additional refrigerant when refrigerant has been leakingfrom the unit. Follow the procedure described below to locate points of leaks andcarry out repairs, then recharge the refrigerant.(1) Detecting LeaksUse the detector for R410A to locate refrigerant leakpoints.(2) Recovering refrigerantNever release the gas to the atmosphere; recover residualrefrigerant using the refrigerant recovery unit for R410A,instead.Do not reuse the recovered refrigerant because itscomposition will have been altered.(3) Welding leaking pointsConfirm again that no residual refrigerant exists in the unitbefore starting welding.Weld securely using flux and wax for R410A.Prevent oxide film from forming inside the tubes utilizingsubstitution with nitrogen (N2) in the refrigerant circuit ofthe unit. Leave ends of tubes open during welding.(4) Checking for sealingUse nitrogen gas for the pressurized gas, and never use arefrigerant other than R410A. Also do not use oxygen orany flammable gas.(5) EvacuationUse a solenoid valve-installed vacuum pump so thateven if power is cut off in the middle of evacuation of airdue to a power interruption, the valve will prevent thepump oil from flowing back.The equipment may be damaged if moisture remains inthe tubing, thus carry out the evacuation thoroughly.When using a vacuum pump with exhaust air volumemore than 0.883 cu.ft./min. and ultimate vacuum pressurerate of 50 micron Hg.Standard time for evacuation(6) RechargingRecharge unit in the same manner explained on theprevious page "(5) Recharging."(2) Recover refrigerantOK(3) Weld leaking pointsOK(4) Check for sealingOK(5) EvacuationOK(6) Recharge(1) Detect leaksOK53