Panasonic S-36PN1E5 Installation Instructions Manual

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Panasonic S-36PN1E5 Installation Instructions Manual Manual pdf 22 page image

225. HOW TO PROCESS TUBING Caution Before Connecting Tubes TightlyThe liquid tubing side is connected by a flare nut, and the gastubing side is connected by brazing.(1) Apply a sealing cap or water-proof tape to prevent dust orwater from entering the tubes before they are used.(2) Be sure to apply refrigerant lubricant (ether oil) to the inside ofthe fl are nut before making piping connections. This is effectivefor reducing gas leaks. (Fig. 5-4)5-1. Connecting the Refrigerant TubingUse of the Flaring MethodApply refrigerant lubricant.Many of conventional split system air conditioners employ thefl aring method to connect refrigerant tubes that run between indoorand outdoor units. In this method, the copper tubes are fl ared ateach end and connected with fl are nuts.Fig. 5-4Flaring Procedure with a Flare Tool(1) Cut the copper tube to the required length with a tube cutter.It is recommended to cut approx. 30 – 50 cm longer than thetubing length you estimate.(3) For proper connection, align the union tube and fl are tubestraight with each other, then screw on the flare nut lightly atfi rst to obtain a smooth match. (Fig. 5-5)(2) Remove burrs at each end of the copper tubing with a tubereamer or fi le. This process is important and should bedone carefully to make a good flare. Be sure to keep anycontaminants (moisture, dirt, metal filings, etc.) from enteringthe tubing. (Figs. 5-1 and 5-2)Union Flare nut Fig. 5-5DeburringBefore After CoppertubingReamer Adjust the shape of the liquid tube using a tube bender at theinstallation site and connect it to the liquid tubing side valveusing a fl are.Cautions During Brazing Replace air inside the tube with nitrogen gas to preventcopper oxide lm from forming during the brazingprocess. (Oxygen, carbon dioxide and Freon are notacceptable.)Fig. 5-1 Fig. 5-2 Do not allow the tubing to get too hot during brazing.The nitrogen gas inside the tubing may overheat, causingrefrigerant system valves to become damaged. Thereforeallow the tubing to cool when brazing.NOTEWhen reaming, hold the tube end downward and be sure that nocopper scraps fall into the tube. (Fig. 5-2)(3) Remove the fl are nut from the unit and be sure to mount it onthe copper tube. Use a reducing valve for the nitrogen cylinder. Do not use agents intended to prevent the formationof oxide lm. These agents adversely affect therefrigerant and refrigerant oil, and may cause damage ormalfunctions.(4) Make a fl are at the end of the copper tube with a fl are tool.(Fig. 5-3)Flare nutCoppertubingFlare tool5-2. Connecting Tubing Between Indoor and OutdoorUnits(1) Tightly connect the indoor-side refrigerant tubing extendedfrom the wall with the outdoor-side tubing.Indoor Unit Tubing Connection ( 1, 2... n-1)Fig. 5-3 Indoor unit type 60 71 100 125 140NOTE Gas tubing (mm) ø15.88Liquid tubing (mm) ø9.52A good fl are should have the following characteristics:(2) To fasten the fl are nuts, apply specifi ed torque. inside surface is glossy and smooth When removing the fl are nuts from the tubing connections, orwhen tightening them after connecting the tubing, be sure touse 2 adjustable wrenches or spanners. (Fig. 5-6)If the fl are nuts are over-tightened, the fl are may be damaged,which could result in refrigerant leakage and cause injury orasphyxiation to room occupants. edge is smooth tapered sides are of uniform lengthTorque wrenchFig.5-6SpannerIndoor unitOutdoor unit