Hitachi Set Free mini-HNRQ1 Series Installation & Maintenance Manual page 27

(2) Precaution for branch pipe connection
Use the branch pipe to connect the outdoor/indoor units. Mounted the branch pipes to a pillar, a wall, or
a ceiling.
Keep the inlet pipe of the branch pipe straight, and the length of the straight pipe is no less than 0.5 meter.
Keep Horizontal
To Indoor Unit
To Outdoor Unit
Upper side
Branch
Pipe
Branch
connection
Min.
Bending
0.5m
Radius
CORRECT
To Indoor Unit
Keep
Vertical
Branch
Connection
Upper side
Branch
Pipe
Main Pipe
Branch Pipe
Branch
Connection
Main Pipe
CORRECT
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Keep Horizontal
Secure the Branch Pipe
to the surface of Pillar or Wall.
Upper side
Straight
Length
Main Pipe
Min. 0.5m
Branch
Connection
Branch Pipe
Branch Pipe
CORRECT
Secure the Branch Pipe
to Ceiling surface or Beam
Upper side
Branch Pipe
Main
Pipe
Branch
Connection
Branch Pipe
INCORRECT