Hitachi RASC UTOPIA RCI-2.0FSN1E Installations- Und Betriebshandbuch Seite 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:
•
-H
Maximum piping length according to the unit:
•
Mark
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
RASC-5
Twin
RASC-10
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H(m)
30
20
10
0
-10
-20
0 10
Single system
L
L
H
Maximum Piping Length
Unit
Actual piping length Equivalent piping length
≤ 50 m
≤ 30 m
Maximum Piping Length
Unit Pipe
Actual piping length
≤ 10 m
A and B
≤ 10 m
A - B
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RASC-10
RASC-5
H(m)
30
20
10
0
-10
-20
20 30 40 50
0 10
L(m)
Twin system
-H
A
A

NOTE:
- For Twin system: L=C+(the longest
distance from indoor unit to branch pipe).
≤ 70 m
≤ 45 m
Equivalent piping length
≤ 8 m
≤ 8 m
20
30
L(m)
C
B
B
C
H
PMGB0126A rev.2 - 11/2006
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