Panasonic CU-J50DBE8 Service Manual

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Panasonic CU-J50DBE8 Service Manual Manual pdf 85 page image

85d. R410A refrigerating machine oilConventionally, mineral oil or a synthetic oil such as alkylbenzene has been used for R22 refrigerating machine oil.Because of the poor compatibility between R410A and conventional oils like mineral oil, however, there is a tendency forthe refrigerating machine oil to collect in the refrigerating cycle. For this reason, polyester and other synthetic oils whichhave a high compatibility with R410A are used as refrigerating machine oil.Because of the high hygroscopic property of synthetic oil, more care must be taken in its handling than was necessary withconventional refrigerating machine oils. Also, these synthetic oils will degrade if mixed with mineral oil or alkylbenzene,causing clogging in capillary tubes or compressor malfunction. Do not mix them under any circumstances.11.1.2. Safety measures when installing/servicing refrigerant pipingCause the gas pressure of R410A is approximately 1.6 times as high as that of R22, a mistake in installation or servicing couldresult in a major accident. It is essential that you use R410A tools and materials, and that you observe the following precautions toensure safety.1. Do not use any refrigerant other than R410A in ACs that have been used with R410A.2. If any refrigerant gas leaks while you are working, ventilate the room. Toxic gas may be generated if refrigerant gas isexposed to a direct flame.3. When installing or transferring an AC, do not allow any air or substance other than R410A to mix into the refrigeration cycle. Ifit does, the pressure in the refrigeration cycle can become abnormally high, possibly causing an explosion and/or injury.4. After finishing the installation, check to make sure there is no refrigerant gas leaking.5. When installing or transferring an AC, follow the instructions in the installation instructions carefully. Incorrect installation canresult in an abnormal refrigeration cycle or water leakage, electric shock, fire, etc.6. Do not perform any alterations on the AC unit under any circumstances. Have all repair work done by a specialist. Incorrectrepairs can result in a water leakage, electric shock, fire, etc.11.2. Tools for installing/servicing refrigerant piping11.2.1. Necessary toolsIn order to prevent an R410A AC from mistakenly being charged with any other refrigerant, the diameter of the 3-way valve serviceport on the outdoor unit has been changed. Also, to increase its ability to withstand pressure, the opposing dimensions have beenchanged for the refrigerant pipe flaring size and flare nut. Accordingly, when installing or servicing refrigerant piping, you must haveboth the R410A and ordinary tools listed below.Table 3 Tools for installation, transferring or replacement*1) You can use the conventional (R22) flaring tool. If you need to buy a new tool, buy the R410A type.*2) Use when it is necessary to detect small gas leaks.For other installation work, you should have the usual tools, such as screwdrivers (+,-), a metal-cutting saw, an electrical drill, a holecore drill (65 or 70 dia.), a tape measure, a level, a thermometer, a clamp meter, an insulation tester, a voltmeter, etc.Table 4 Tools for serving*1) Always replace the dryer of the outdoor unit at the same time. The replacement dryer is wrapped in a vacuum pack. Replace itlast among the refrigerating cycle parts. Start brazing as soon as you have opened the vacuum pack, and begin the vacuumingoperation within 2 hours.Type of work Ordinary tools R410A toolsFlaring Flaring tool (clutch type), pipe cutter,reamerCopper pipe gauge for clearanceAdjustment, flaring tool (clutch type)*1)Bending, connecting pipes Torque wrench (nominal diameter 1/4, 3/8,1/2). Fixed spanner (opposing sides 12mm, 17 mm, 19 mm). Adjustable wrench,Spring benderAir purging Vacuum pump. Hexagonal wrench(opposing sides 4 mm)Manifold gauge, charging hose, vacuumpump adaptorGas leak inspection Gas leak inspection fluid or soapy water Electric gas leak detector for HFCrefrigerant*2)Type of work Ordinary tools R410A toolsRefrigerant charging Electronic scale for refrigerant charging.Refrigerant cylinder. Charging orifice andpacking for refrigerant cylinderBrazing (Replacing refrigerating cyclepart*1)Nitrogen blow set (be sure to use nitrogenblowing for all brazing), and brazingmachine