Hitachi RPI-10FSNE - Refrigerant Piping Selection and System Installation; Pipe Sizing and Distributor Installation

19
PMGB0126A rev.2 - 11/2006
English
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
Unit
Gas piping
size
Liquid piping
size
Distributor
Twin Triple
Quad
RASC-5 15.88 (5/8”) 9.53 (3/8”) TE-56N - -
RASC-10 25.4 (1”) 12.7 (1/2”) TE-10N TRE-810N QE-810N
For RASC-10 units, use a reducer pipe in the following
installations:
Installation
type
Distributor
Pipe
Remarks
(*) Single installations with
RPI-10HP manufactured
from Feb’07, the reducer is
not required.
Type
Dimensions
a b
Single -
Gas Ø 25.4 Ø 22.2 (*)
Liquid Ø 12.7 Ø 9.53 (*)
Twin
TE-56N Liquid Ø 9.53 Ø 6.35 indoor 2.0HP
Triple
TRE-810N Liquid Ø 12.7 Ø 9.53 -
Quad QE-810N Liquid Ø 12.7 Ø 9.53 -
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
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
•
-
-
•
•
•
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
NOTE:
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:
This is wrong position.
4. Correct position of Triple and Quad Distributor.
Install the header horizontally
Sample: Triple Branch pipe
-
•
•
•
Indoor units
Smaller than
0.5mm
Height difference between two
indoors. Smaller than 0.5m
Branch pipe
Horizontal
To outdoor unit
To indoor
unit
Vertical
To indoor
unit
Fixing the branch pipie
to the surface of pillar
or wall
Horizontal
Horizontal
Fixing the branch pipe
to ceiling or beam
Up
Down
Greater
than 0.5m
Main Pipe
Refrigerant direction
Refrigerant
direction
Main Pipe
Branch
pipe
Up
Down
Main Pipe
Refrigerant
direction
Main Pipe
Branch
pipe
Branch
pipe
Branch
pipe
Gas piping
Liquid piping
a
b