1-9511-13. HOW TO PROCESS TUBINGThe liquid tubing side is connected by a flare nut, and the gas tubing side is connected by brazing.1. Connecting the Refrigerant TubingUse of the Flaring MethodMany of conventional split system air conditioners employ the flaring method to connect refrigerant tubes that runbetween indoor and outdoor units.In this method, the copper tubes are flared 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 cmlonger than the tubing length you estimate.(2) Remove burrs at each end of the copper tubing with atube reamer 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. (Figs. 1- 33 and 1- 34)When reaming, hold the tube end downward and be sure thatno copper scraps fall into the tube. (Fig. 1- 34)(3) Remove the flare nut from the unit and be sure to mount iton the copper tube.AfterBeforeDeburringCoppertubingReamerFig. 1- 33Fig. 1- 34Fig. 1- 35NOTENOTE(4) Make a flare at the end of the copper tube with a flare tool.(Fig. 1- 35)A good flare should have the following characteristics:inside surface is glossy and smoothedge is smoothtapered sides are of uniform lengthFlare size: A (mm)A Copper tubing(Outer dia.) A 0–0.4ø6.35ø9.52ø12.7ø15.88ø19.059.113.216.619.724.0Flare nutCoppertubingFlare toolAMP Air Conditioningwww.ampair.co.uk | sales@ampair.co.uk
