Installation Guide
Table Of Contents
18
Determination of diameter of branch pipe of the IDU
The IDU is equipped with branch pipes h~p. Refer to the following table for the selection of the branch
pipe size. Unit: mm
IDU capacity
When the length of the branch pipe ≤ 10
m or distance from the IDU
from nearest
branch pipe <20 m (outer diameter x
minimum wall thickness)
When the length of the branch pipe > 10 m or
distance from the IDU from nearest branch
pipe > 20
m (outer diameter x minimum wall
thickness)
A (x100W) Gas side Liquid side Gas side Liquid side
A < 71 φ12.7x0.8 φ6.35x0.8 φ15.9x1.0 φ9.5x0.8
A > 71 Piping according to the normal pipe diameter
Note: In order to ensure the best use effect of the IDU, control the length of the branch pipe within 10 m
(shall not exceed 30 m), otherwise the indoor heat exchange effect will be affected.