Hitachi RASC UTOPIA RCI-2.0FSN1E Installations- Und Betriebshandbuch Seite 31

REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.4.2. REFRIGERANT PIPING SELECTION
Select the piping connection sizes according to the following
•
procedures:
Between Outdoor Unit and branch pipe:
-
Select the same pipe connection size as the pipe size of the
Outdoor Unit
Between branch pipe and Indoor Unit:
-
Select the same pipe connection size as the pipe size of the
Indoor Unit
Gas piping
Unit
size
RASC-5 15.88 (5/8")
RASC-10 25.4 (1")
For RASC-10 units, use a reducer pipe in the following
•
installations:
Installation
Distributor
type
Single -
Twin TE-56N
Triple TRE-810N
Quad QE-810N
11.4.3. Twin, TRIPLE AND QUAD System Installation
Height Difference Between Indoor Units and Distributor
•
Install all indoor units at the same height. When the
height difference between the indoor units due to building
construction is necessary, this should be less than 0,5
meters. Install the branch pipe at the same height of indoor
units or lower, but never higher.
Sample: Twin system
Indoor units
Installing Distributor
•
1. Install the Distributor supplied by HITACHI on request
A tee can not be installed instead of a branch pipe.
Sample: Twin System
Downloaded from www.Manualslib.com
Distributor
Liquid piping
size
Twin Triple Quad
9.53 (3/8") TE-56N -
12.7 (1/2") TE-10N TRE-810N QE-810N
Pipe
Remarks
Dimensions
Type
a b
Gas Ø 25.4 Ø 22.2 (*)
b
Liquid Ø 12.7 Ø 9.53 (*)
Liquid Ø 9.53 Ø 6.35 indoor 2.0HP
(*) Single installations with
Liquid Ø 12.7 Ø 9.53 -
RPI-10HP manufactured
from Feb'07, the reducer is
Liquid Ø 12.7 Ø 9.53 -
not required.
Height difference between two
indoors. Smaller than 0.5m
Smaller than
0.5mm
manuals search engine
2. Installing the Distributor.
Fix the branch pipe horizontally to the pillar, wall or ceiling.
Piping must not be fixed rigidly to the wall as thermal
expansion and contraction can cause pipe fracture.
Sample: Twin System
Horizontal
To indoor
unit
-
To outdoor unit

NOTE:
a
- Fix the piping from outside of insulation or inserting
absorber between the pipe and a fixing metal.
3. Correct position of twin distributor
This is the correct position of twin Branch Pipe:
•
Greater
than 0.5m
This is wrong position.
•
Branch pipe
Branch
pipe
4. Correct position of Triple and Quad Distributor.
Install the header horizontally
•
Sample: Triple Branch pipe
Liquid piping
To indoor
unit
Fixing the branch pipie Fixing the branch pipe
to the surface of pillar
or wall
Up
Refrigerant
direction
Main Pipe
Refrigerant direction
Down
Up
Main Pipe
Main Pipe
Refrigerant
direction
Branch
Branch
pipe
Down
Gas piping
PMGB0126A rev.2 - 11/2006
Horizontal
Horizontal
to ceiling or beam
Branch
pipe
Main Pipe
pipe
19