Panasonic CS-PE9DKE Service Manual

Panasonic CS-PE9DKE Service Manual Manual pdf 52 page image

d. R410A refrigerating machine oilConventionally, mineral oil or a synthetic oil such as alkylbenzene has been used for R22 refrigerating machineoil. Because of the poor compatibility between R410A and conventional oils like mineral oil, however, there is atendency for the refrigerating machine oil to collect in the refrigerating cycle. For this reason, polyester andother synthetic oils which have 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 wasnecessary with conventional refrigerating machine oils. Also, these synthetic oils will degrade if mixed withmineral oil or alkylbenzene, causing clogging in capillary tubes or compressor malfunction. Do not mix themunder any circumstances.10.1.2 Safety Measure When Installing / Receiving Refrigerant PipingCause the gas pressure of R410A is approximately 1.6 times as high as that of R22, a mistake in installation orservicing could result in a major accident. It is essential that you use R410a tools and materials, and that youobserve the following precautions to ensure safety.Do not use any refrigerant other than R410A in Acs that have been used with R410A.If any refrigerant gas leaks while you are working, ventilate the room. Toxic gas may be generated if refrigerantgas is exposed to a direct flame.When installing or transferring an AC, do not allow any air or substance other than R410A to mix into therefrigeration cycle. If it does, the pressure in the refrigeration cycle can become abnormally high, possiblycausing an explosion and/or injury.After finishing the installation, check to make sure there is no refrigerant gas leaking.When installing or transferring an AC, follow the instructions in the installation instructions carefully. Incorrectinstallation can result in an abnormal refrigeration cycle or water leakage, electric shock, fire, etc.Do not perform any alterations on the AC unit under any circumstances. Have all repair work done by a specialist.Incorrect repairs can result in an water leakage, electric shock, fire, etc.10.2. TOOL FOR INSTALLING / SERVICING REFRIGERANT PIPING10.2.1 Necessary ToolsIn order to prevent an R410A AC from mistakenly being charged with any other refrigerant, the diameter of the 3-wayvalve service port on the outdoor unit has been changed. Also, to increase its ability to withstand pressure, theopposing dimensions have been changed for the refrigerant pipe flaring size and flare nut. Accordingly, wheninstalling or servicing refrigerant piping, you must have both the R410A and ordinary tools listed below.1.2.3.4.5.6.Type of workFlaringBending, connecting pipesAir purgingGas leak inspectionTable 3 Tools for installation, transferring or replacementOrdinary tools R410A toolsFlaring tool (clutch type), pipe cutter, reamerTorque wrench (nominal diameter 1/4,3/8,1/2) Fixed spanner (opposing sides 12mm, 17 mm, 19 mm) Adjustable wrench,Spring benderVacuum pump Hexagonal wrench(opposing sides 4 mm)Gas leak inspection fluid or soapy waterCopper pipe gauge for clearanceAdjustment, flaring tool (clutch type)*1)Manifold gauge, charging hose, vacuumpump adaptorElectric gas leak detector for HFCrefrigerant*2)*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, anelectrical drill, a hole core drill (65 or 70 dia.), a tape measure, a level, a thermometer, a clamp meter, an insulationtester, a voltmeter, etc.Table 4 Tool for servingType of work Ordinary tools R410A toolsRefrigerant chargingBrazing (Replacing refrigeratingcycle part*1)Nitrogen blow set (be sure to use nitrogenblowing for all brazing), and brazing), andbrazing machineElectronic scale for refrigerant chargingRefrigerant cylinder Charging orifice andpacking for refrigerant cylinder*1) Always replace the dryer of the outdoor unit at the same time. The replacement dryer is wrapped in a vacuumpack. Replace it last among the refrigerating cycle parts. Start brazing as soon as you have opened the vacuum pack,and begin the vacuuming52CS-PE9DKE / CU-PE9DKE / CS-PE12DKE / CU-PE12DKE