Hitachi Highly WHP09100VUKPA8LT6, Installation Manual

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H E A T P U M P W A T E R H E A T E R C O M P R E S S O R C R I T E R I A PAGE：15/30
（27）The fuse or/and breaker should be equipped in the main circuit.
(28) The thickness of the refrigerating system using tube
the tube thickness as followed
external diameter(mm)
6.35 9.52 12.7 15.88 19.05 22.2 25.4 31.75 38.1 44.45
Thickness（ mm）
0.8 0.8 0.8 1 1 1 1 1.1 1.4 1.5