Daikin VRV-WIII Installation Manual

Contents

English 10Not recommendable but in case of emergencyYou must use a torque wrench but if you are obliged to install the unitwithout a torque wrench, you may follow the installation method men-tioned below.After the work is finished, make sure to check that there is nogas leak.When you keep on tightening the flare nut with a spanner, there is apoint where the tightening torque suddenly increases. From thatposition, further tighten the flare nut the angle shown below:9-4 Connecting the refrigerant pipingConnect piping to outside unit by using accessory pipes(Refer to figure 20)1. Gas side piping2. (field supply)3. Accessory pipe (2) (THICK)4. Liquid side pipe (field supply)5. Flare nut (Included in the unit)6. Accessory pipe (1) (THIN) and (3)is not used.7. Piping on HP/LP gas side (field supply)8. Piping on suction gas side (field supply)9. Cut off the hatched area and use it as a cover for thedrilled.10. Hatched area11. Accessory pipe (1) (THIN)12. Accessory pipe (2) and Accessory pipe (3)13. Guideline for pipe machining14. Accessory pipe (3)15. Brazing16. Accessory pipe (2) (THICK)17. Before fitting to the product, apply brazing.Precautions for installation of unitsNote• The outside unit multi connection piping kit that is sold separatelyas an option (BHFP22MA56·84, BHFP26MA56·84) is necessaryfor the multi installation of outside units.• See the installation manual attached to the kit with attention toinstallation restrictions described in “connecting the refrigerantpiping” when installing.1. To avoid the risk of oil detention in the piping the piping betweenthe outside units must be routed level or slightly upward.2. The gas piping (both discharge and suction gas pipings in case ofthe heat recovery system) after branched, install without fail a trapof 200 mm or larger using the piping included in the piping kit forconnecting the outside unit. Otherwise, the refrigerant may staywithin the piping, causing any damage to the outside unit.3. If the piping length between the outside unit connecting pipe kitor between the outside units exceeds 2 m, create a rise of200 mm or more in the gas line within a length of 2 m from the kit.Pipe size Further tightening angle Recommended arm length of toolφ9.5 60 to 90 degrees Approx. 200 mmφ12.7 30 to 60 degrees Approx. 250 mmφ15.9 30 to 60 degrees Approx. 300 mmPattern 1Pattern 2Prohibited patternto indoor unitto indoorunitto indoorunitDownwardinclinationDownwardinclinationChange to pattern 1 or pattern 2Oil remains in pipingPiping between outside units200mmor moreNo trap has been installed in the gas piping.★Oil may remain in the farthest outside unit.Change to pattern 1 or pattern 2to indoor unitProhibited patternto indoorunitto indoorunitIf 2 m or lessIf 2 m or more 2m or less2m or lessRising height:200 mm or morePiping between outside unit