– 10 –
5-1. Refrigerant Piping
5-1-1. Permissible Piping Length and Head
The minimum inter-unit refrigerant piping length shall
be 2m.
Limit the number of bends in the refrigerant piping to
10 or less.
RAS-09EK
RAS-09EK
Unit B
Unit C
H
3
2
RAS-09EK
Unit D
RAS-09EK
1
h
h
H
Unit A
4
Fig. 5-2
Table 5-1
Remarks
Fig. 5-2
Model
RAS-09EK
Between units A
and B piping
head (
∆∆∆∆∆
h)
1m
Connectable
indoor unit
number
4
Permissible
piping length
15m (
1
+
2
)
15m (
3
+
4
)
Permissible
difference
pipe lengths
8m (
1
–
2
)
8m (
3
–
4
)
5-1-3. Air Purging
•
Subject the refrigerant tube of outdoor and in-
door units to air purge with a vacuum pump.
•
Do not carry out this air purge by using the refrig-
erant filled in the outdoor unit.
•
To handle valves, a 5 mm hexagon wrench is
needed.
Phosphate deoxidized copper
seamless pipes for air conditioners
RAS-09EK
9.5
6.4
Piping material
Model
Larger
Smaller
Piping
size
(mm)
5-1-4. Refrigerant Pipe Connecting Position
Accessory parts
attached in a
carton box (
φ
9.5)
Unit A
Unit B
Unit C
Unit D
Unit A (
φ
6.4)
Unit B (
φ
6.4)
Unit C (
φ
6.4)
Unit D (
φ
6.4)
Fig. 5-3
5-1-5. Additional Refrigerant Quantities
Table 5-2
Model
Addition per meter
RAV-M240A-E
No need
5-1-2. Piping Material and Sizes
Table 5-2
Permissible
piping head (H)
5m
