Panasonic S-26PU2U6 Installation Instructions Manual

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Panasonic S-26PU2U6 Installation Instructions Manual Manual pdf 16 page image

165. HOW TO PROCESS TUBINGThe liquid tubing side is connected by a flare nut, and thegas tubing side is connected by brazing.5-1. Connecting the Refrigerant TubingUse of the Flaring MethodMany of conventional split system air conditioners employthe flaring method to connect refrigerant tubes which runbetween indoor and outdoor units. In this method, thecopper tubes are flared at each end and connected withflare nuts.Flaring Procedure with a Flare Tool(1) Cut the copper tube to the required length with a tubecutter. It is recommended to cut approx. 1 – 2 ft. (30 -50 cm) longer than the tubing length you estimate.(2) Remove burrs at the end of the copper tube with a tubereamer or a similar tool. This process is important andshould be done carefully to make a good flare. (Fig. 5-1)NOTEWhen reaming, hold the tube end downward and be surethat no copper scraps fall into the tube. (Fig. 5-2)(3) Remove the flare nut from the unit and be sure to mountit on the copper tube.(4) Make a flare at the end of the copper tube with a flaretool. (Fig. 5-3)NOTEA good flare should have the following characteristics:● inside surface is glossy and smooth● edge is smooth● tapered sides are of uniform lengthCaution Before Connecting Tubes Tightly(1) Apply a sealing cap or water-proof tape to prevent dustor water from entering the tubes before they are used.(2) Be sure to apply refrigerant lubricant to the matchingsurfaces of the flare and union before connecting themtogether. This is effective for reducing gas leaks. (Fig.5-4)(3) For proper connection, align the union tube and flaretube straight with each other, then screw in the flare nutlightly at first to obtain a smooth match. (Fig. 5-5)● Adjust the shape of the liquid tube using a tube bender atthe installation site and connect it to the liquid tubing sidevalve using a flare.AfterBeforeDeburringCoppertubingReamerFig. 5-1Fig. 5-2Fig. 5-3Fig. 5-4Fig. 5-5Flare nutCoppertubingFlare toolApply refrigerantlubricant.Flare nutUnion