Panasonic CU-2E15LBE Service Manual

Also see for CU-2E15LBE: Operating instructions Operating instructions Operating instructions Operating instructions Operating instructions

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Panasonic CU-2E15LBE Service Manual Manual pdf 42 page image

42CUTTING AND FLARING THE PIPING1. Please cut using pipe cutter and then remove the burrs.2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.Turn the piping end down to avoid the metal powder entering the pipe.3. Please make flare after inserting the flare nut onto the copper pipes.10.2.4. Evacuation Of The EquipmentWHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in thefollowing procedure.1. Connect a charging hose with a push pin to the Low sideof a charging set and the service port of the gas side3-way valve.• Be sure to connect the end of the charging hose with thepush pin to the service port.2. Connect the center hose of the charging set to a vacuumpump.3. Turn on the power switch of the vacuum pump and makesure that the needle in the gauge moves from 0 cmHg (0MPa) to -76 cmHg (-0.1 MPa). Then evacuate the airapproximately ten minutes.4. Close the Low side valve of the charging set and turn offthe vacuum pump. Make sure that the needle in thegauge does not move after approximately five minutes.Note : BE SURE TO TAKE THIS PROCEDURE INORDER TO AVOID REFRIGERANT GASLEAKAGE.5. Disconnect the charging hose from the vacuum pumpand from the service port of the 3-way valve.6. Tighten the service port caps of gas side 3-way valve at atorque of 18 N•m with a torque wrench.7. Remove the valve caps of both of the gas side and liquidside 3-way valve. Position both of the valves to “OPEN”using a hexagonal wrench (4 mm).8. Mount valve caps onto the gas side and liquid side of the3-way valve.• Be sure to check for gas leakages.• If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step above take the following measure:- If the leak stops when the piping connections are tightened further, continue working from step .- If the leak does not stop when the connections are retightened, repair the location of leak.- Do not release refrigerant during piping work for installation and reinstallation.- Take care of the liquid refrigerant, it may cause frostbite.