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Refrigerant piping & refrigerant charge
13.4.2 System Installation (examples)
Height Difference Between Indoor Units and Distributor
It is recommended to install all indoor units at the same height.
When the height difference between the indoor units due to build-
ing construction is necessary, this should be less than the value
indicated in the table. Install the branch pipe at the same height of
indoor units or lower, but never higher.
Indoor unit
Indoor
Height Difference between two
unit
indoors smaller than H
Smaller than 3 m
≤
Premium
Standard
Installing Distributor
1 Install the Distributor supplied by HITACHI on request.
A tee can not be installed instead of a branch pipe.
2 Installing the distributor
Fix the branch pipe horizontally to the pillar, wall or ceiling. Pip-
ing must not be fixed rigidly to the wall as thermal expansion and
contraction can cause pipe fracture.
31
PMML0251A rev.2 - 02/2013
Branch pipe
≤
O.U. (HP)
H (m)
3
3
4-10
10
3-10
3
Horizontal
To Indoor
Vertical
Unit
To Outdoor unit
Fixing the branch pipe to
the surface of pillar or wall
(pictures as example)
N O T E
Fix the piping from outside of insulation or inserting absorber be-
tween the pipe and a fixing metal.
3 Correct position of distributor (available also for quad instal-
lation)
•
This is the correct position:
G r e a t e r
than 0.5 m
Main pipe
Refrigerant direction
•
This is wrong position.
Refrigerant direction
Main pipe
Branch pipe
Branch pipe
(pictures as example)
To Indoor unit
Horizontal
Horizontal
Fixing the branch pipe to
ceiling or beam
Up
Branch pipe
Refrigerant di-
rection
Main pipe
Down
Branch pipe
Refrigerant di-
rection
Main pipe
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