SiENBE28-901
Test Operation
Air Cooled Refrigeration Condensing Unit
59
5.1.2 Selection of Piping Material
Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such
as sulphur, oxide, dust, chips, oil and fat, and water.
It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m.
Use the following type of refrigerant piping.
Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer
diameter of 15.9 mm and C1220T-1/2H for a minimum outer diameter of 19.1 mm)
Refrigerant piping size and wall thickness: Decide the size and thickness from the following table.
(This product uses R410A. The withstand pressure of O type may be insufficient if it is
used for piping with a minimum diameter of 19.1 mm. Therefore, be sure to use 1/2 H type
with a minimum thickness of 1.0 mm.
If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of
1.2 mm will be required. In that case, be sure to perform the blazing of each joint.)
Be sure to perform piping work within the range specified in the following table.
¢
Refrigerant piping length
²
Max. permissible
one-way piping length
(equivalent length)
LRMEQ5~20AY1
a + b + c + d
≤
130m (d is d1 or d2 or e, f whichever is longer)
LRLEQ5~20AY1
a + b + c + d
≤
70m (d is d1 or d2 whichever is longer)
Max. branch piping length (actual length)
b + c + d
≤
30m (d is d1 or d2 whichever is longer)
Max. difference in
height between indoor
and outdoor units
unit below outdoor unit
H
≤
35m (Note)
unit above outdoor unit
H
≤
10m
Difference in height between indoor units
H1
≤
5m
Note: A trap is required at 5 m intervals from outdoor unit.
¢
Refrigerant piping size
²
(MT (Medium Temperature)) LRMEQ5~20AY1
(Unit : mm)
Outdoor unit side
Piping size
Liquid pipe
Gas pipe
50m or less
50~130m
50m or less
50~130m
5A · 6A type
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
19.1 × 1.0 (1/2H type)
φ
22.2 × 1.0 (1/2H type)
8A · 10A · 12A type
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
25.4 × 1.0 (1/2H type)
φ
28.6 × 1.0 (1/2H type)
15A · 20A type
φ
12.7 × 0.8 (O type)
φ
15.9 × 1.0 (O type)
φ
31.8 × 1.1 (1/2H type)
φ
34.9 × 1.1 (1/2H type)
Piping between branching areas
(B, b, C, c)
Select the piping from the following table in accordance with the total capacity of indoor units
connected downstream.
No size after branching can exceed the size of any upstream piping.
Piping between branching areas and each unit
Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit.
(LT (Low Temperature)) LRLEQ5~20AY1
(Unit : mm)
Outdoor unit side
Piping size
Liquid pipe
Gas pipe
50m or less
50~70m
25m or less
25~70mm
5A · 6A type
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
19.1 × 1.0 (1/2H type)
φ
22.2 × 1.0 (1/2H type)
8A · 10A · 12A type
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
25.4 × 1.0 (1/2H type)
φ
28.6 × 1.0 (1/2H type)
15A · 20A type
φ
12.7 × 0.8 (O type)
φ
15.9 × 1.0 (O type)
φ
31.8 × 1.1 (1/2H type)
φ
34.9 × 1.1 (1/2H type)
Piping between branching areas
(B, b, C, c)
Select the piping from the following table in accordance with the total capacity of indoor units
connected downstream.
No size after branching can exceed the size of any upstream piping.
Piping between branching areas and each unit
Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit.
H
Outdoor unit
Liquid piping
Gas piping
A
B
C
D2
F
E
D1
Showcase
H1
Unit
cooler
f
e
d1
a
b
c
d2
Total capacity of indoor units after branching
Gas pipe size
Liquid pipe size
Less than 6.0 kW
φ
12.7 × 0.8 (O type)
φ
6.4 × 0.8 (O type)
6.0 kW or over and less than 9.9 kW
φ
15.9 × 1.0 (O type)
φ
9.5 × 0.8 (O type)
9.9 kW or over and less than 14.5 kW
φ
19.1 × 1.0 (1/2H type)
14.5 kW or over and less than 18.5 kW
φ
22.2 × 1.0 (1/2H type)
18.5 kW or over and less than 25.0 kW
φ
25.4 × 1.0 (1/2H type)
25.0 kW or over and less than 31.0 kW
φ
28.6 × 1.0 (1/2H type)
φ
12.7 × 0.8 (O type)
31.0 kW or over
φ
31.8 × 1.1 (1/2H type)
Total capacity of indoor units after branching
Gas pipe size
Liquid pipe size
Less than 2.3 kW
φ
12.7 × 0.8 (O type)
φ
6.4 × 0.8 (O type)
2.3 kW or over and less than 4.4 kW
φ
15.9 × 1.0 (O type)
φ
9.5 × 0.8 (O type)
4.4 kW or over and less than 6.4 kW
φ
19.1 × 1.0 (1/2H type)
6.4 kW or over and less than 7.8 kW
φ
22.2 × 1.0 (1/2H type)
7.8 kW or over and less than 10.8 kW
φ
25.4 × 1.0 (1/2H type)
10.8 kW or over and less than 13.4 kW
φ
28.6 × 1.0 (1/2H type)
φ
12.7 × 0.8 (O type)
13.4 kW or over
φ
31.8 × 1.1 (1/2H type)
