Hitachi HNE Serie Manual De Instalación Y Funcionamiento página 30

REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.4. PIPING AND REFRIGERANT CHARGE
11.4.1. REFRIGERANT PIPING LENGTH
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart. Keep the design
point within the dark area of the chart, wich is showing the applicable height difference according to piping length.
Chart for piping design:
•
Example in a Single and Twin systems:
•
Single system
-H
L
Maximum piping length according to the unit:
•
Mark
Unit
Actual piping length
RASC-5
L
RASC-10
L = Piping length.

NOTE:
- Install the branch pipe at the location from where the piping length to the indoor units is of equal distance. However, when
different piping lengths from the branch pipe to the indoor units, due to building construction are required, the difference
between the two pipes should be as indicate in the table.
System
Unit Pipe
RASC-5 A and B
Twin
RASC-10 A - B
All manuals and user guides at all-guides.com
RASC-5
H(m)
30
20
10
0
-10
-20
10 20 30 40 50
0
L
-H
H
Maximum Piping Length
Equivalent piping length
≤ 50 m ≤ 70 m
≤ 30 m ≤ 45 m
Maximum Piping Length
Actual piping length Equivalent piping length
≤ 10 m
≤ 10 m
RASC-10
H(m)
30
20
10
0
-10
-20
20
0 10 30
L(m)
L(m)
Twin system
C
B
A
B
A
C

NOTE:
- For Twin system: L=C+(the longest
distance from indoor unit to branch pipe).
≤ 8 m
≤ 8 m
PMGB0126A rev.2 - 11/2006
H
18