Panasonic K2 Series Installation Instruction

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Panasonic K2 Series Installation Instruction Manual pdf 18 page image

185. 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 a tubereamer or a similar tool. This process is important andshould be done carefully to make a good flare. Be sure tokeep any contaminants (moisture, dirt, metal filings, etc.)from entering the tubing.AfterBeforeDeburringCoppertubingReamerNOTEWhen reaming, hold the tube end downward and be sure thatno copper scraps fall into the tube.(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.Flare nutCoppertubingFlare toolNOTEA good flare should have the following characteristics:l inside surface is glossy and smoothl edge is smoothl 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.Apply refrigerant lubricant.(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.Flare nutUnionl 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 andOutdoor UnitsNOTEWhen connecting to the mini VRF 8HP, 10HP (outdoor unit),select the main tube by using the following values. For details,refer to the installation instructions of the outdoor unit.Indoor unit 45 56 73 106Type K2 0.152 0.188(1) Tightly connect the indoor-side refrigerant tubing extendedfrom the wall with the outdoor-side tubing.(2) To fasten the flare nuts, apply specified torque.Indoor Unit Tubing Connection ( 1, 2... n-1)Indoor unit type 45 56 73 106Gas tubing (mm) ø12.7 ø15.88Liquid tubing (mm) ø6.35 ø9.52l When removing the flare nuts from the tubing connections,or when tightening them after connecting the tubing, be sureto use a torque wrench and a spanner.If the flare nuts are over-tightened, the flare may be damaged,which could result in refrigerant leakage and cause injury orasphyxiation to room occupants.Outdoor unitTorque wrenchSpannerIndoor unit