Panasonic S-22MM1E5A Installation Instructions Manual

Panasonic S-22MM1E5A Installation Instructions Manual Manual pdf 16 page image

165. HOW TO PROCESS TUBING5-1. Connecting the Refrigerant TubingUse of the Flaring MethodMany of conventional split system air conditioners employ theflaring method to connect refrigerant tubes that run betweenindoor and outdoor units. In this method, the copper tubes areflared at each end and connected with flare 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. 30 – 50 cm longerthan the tubing length you estimate.(2) Remove burrs at each end of the copper tubing with atube reamer or file. This process is important and shouldbe done carefully to make a good flare. Be sure to keepany contaminants (moisture, dirt, metal filings, etc.) fromentering the tubing. (Figs. 5-1 and 5-2)AfterBeforeDeburringCoppertubingReamerFig. 5-1 Fig. 5-2NOTEWhen reaming, hold the tube end downward and be sure thatno copper scraps fall into the tube. (Fig. 5-2)(3) Remove the flare nut from the unit and be sure to mount iton the copper tube.(4) Make a flare at the end of the copper tube with a flare tool.(Fig. 5-3)Flare nutCopper tubingFlare toolFig. 5-3NOTEA 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 dust orwater from entering the tubes before they are used.(2) Be sure to apply refrigerant lubricant (ether oil) to theinside of the flare nut before making piping connections.This is effective for reducing gas leaks. (Fig. 5-4)Apply refrigerant lubricant.Fig. 5-4(3) For proper connection, align the union tube and flare tubestraight with each other, then screw on the flare nut lightlyat first to obtain a smooth match. (Fig. 5-5)Flare nutUnionFig. 5-5● Adjust the shape of the liquid tube using a tube bender at theinstallation site and connect it to the liquid tubing side valveusing a flare.5-2. 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 ConnectionIndoor unit type 15 22 28 36 45 56Gas tubing (mm) ø12.7Liquid tubing (mm) ø6.35(2) To fasten the flare nuts, apply specified torque.● When removing the flare nuts from the tubing connections,or when tightening them after connecting the tubing, be sureto use 2 adjustable wrenches or spanners. (Fig. 5-6)If the flare nuts are over-tightened, the flare may bedamaged, which could result in refrigerant leakage andcause injury or asphyxiation to room occupants.Outdoor unitTorque wrenchSpannerIndoor unitFig. 5-6AMP Air Conditioningwww.ampair.co.uk | sales@ampair.co.uk