Hitachi RAS-8HNCE User Manual

22
Refrigerant piping & refrigerant charge
PMML0317A rev.1 - 11/2013
Line branch system (Only allowed for IVX series)
A
B
D
c
(mm)
Multi Kit
Model A
Multi Kit
Model B
Outdoor
Unit HP
Pipe Size (C, D) (L4)
IVX Series
Gas Liquid
3 / 4 / 5 / 6 Ø15.88 Ø9.52 E-102SN(2/3) E-102SN(2/3)
8 Ø25.40 Ø9.52
(1)
E-162SN(2/3) E-102SN(2/3)
10 /12 Ø25.40 Ø12.70 E-162SN(2/3) E-102SN(2/3)
(1) In case that pipe length exceeds 70m in 8 HP, please use a
Ø12.7 pipe as a liquid pipe.
Indoor Unit capacity
Pipe Size (L3)
Gas Liquid
≤ 1.5 HP Ø12.70 Ø6.35
from 1.8 to 2.0 HP Ø15.88 Ø6.35
≥ 2.3 HP Ø15.88 Ø9.52
Connections including Indoor Units 8 and 10 HP are not possible
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 gure
ื
10m (IVX-P)
3m (IVX-C)
ืืืื
20m
ืืืื
30m
IU1
IU4
IU3
IU2
OU1
OU1
ื
3m
ื
3m
ื
3m
ื
3m
ื
3m
ื
3m
(ื
6m)
O.U higher
O.U lower
10m (IVX-P)
3m (IVX-C)
ื
ื
ืื
ืื
ืื
ืื
ืื
ืื
High difference O.U/IU
O.U higher ≤30m
O.U lower ≤20m

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 xed rigidly to the wall as thermal expansion and
contraction can cause pipe fracture.
Horizontal
To Indoor
Unit
To Outdoor unit
Vertical
To Indoor unit
Fixing the branch pipe to
the surface of pillar or wall
Horizontal
Horizontal
Fixing the branch pipe to
ceiling or beam
(pictures as example)
N O T E
Fix the piping from outside of insulation or inserting absorber be-
tween the pipe and a xing 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
Up
Branch pipe
Main pipe
Refrigerant di-
rection
Down
• This is wrong position.
Main pipe
Refrigerant direction
Branch pipe
Branch pipe
Refrigerant di-
rection
Branch pipe
Main pipe
(pictures as example)

Hitachi RAS-8HNCE Specifications

General

Brand	Hitachi
Model	RAS-8HNCE
Category	Air Conditioner
Language	English