Panasonic CU-2E15PBE - Cu-2 E18 Pbe

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9.2 CU-2E18PBE
9.2.1 Check Points
9.2.2 The Shapes of the 3-Way Valve Caps of the Outdoor Unit Have Been Changed
 Accompanying the changes in the shapes of the 3-way valve caps, the tightening method has also been changed.
 Firmly tighten the 3-way valve caps by hand, and then tighten them up by another 30 degrees or so (one-twelfth
of a full turn) using a spanner or adjustable spanner.