SiBE811001EB
Test Operation
CONVENI-PACK
58
5.3.2 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 R-410A. 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.
Max. permissible
one-way piping length (equivalent length)
Max. difference in
height between indoor
and outdoor units
Difference in height between unit cooler and showcase
unit below outdoor unit
unit above outdoor unit
a + b + c + d1
≤
130m (d1 is d or e whichever is longer)
a2 + b2 + e1
≤
130m (e1 is d2 or e2 whichever is longer)
b + c + d1
≤
30m (d1 is d or e whichever is longer)
b2 + e1
≤
30m (e1 is d2 or e2 whichever is longer)
H1, H2
≤
35m (Note)
H1, H2
≤
10m
H3
≤
5m
H4
≤
0.5m
Max. branch piping length (actual length)
Difference in height between air-conditioner indoor units
Note: A trap is required at 5 m intervals from outdoor unit.
<Refrigerant piping length>
<Refrigerant piping size>
(Refrigeration)
Outdoor unit side
Piping size (mm)
Liquid pipe
Gas pipe
50m or less
50~130m
50m or less
50~130m
Piping between branching areas and each unit
No size after branching can exceed the size of any upstream piping.
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
6.4 × 0.8 (O type)
φ
9.5 × 0.8 (O type)
φ
15.9 × 1.0 (1/2H type)
φ
19.1 × 1.0 (1/2H type)
φ
22.2 × 1.0 (1/2H type)
φ
25.4 × 1.0 (1/2H type)
φ
25.4 × 1.0 (1/2H type)
φ
28.6 × 1.2 (1/2H type)
Total capacity of indoor units after branching
Less than 6.0 kW
6.0 kW or over and less than 9.9 kW
9.9 kW or over and less than 14.5 kW
14.5 kW or over and less than 18.5 kW
18.5 kW or over
Gas pipe size
Liquid pipe size
(Air conditioning)
Outdoor unit side
Piping size (mm)
Liquid pipe
Gas pipe
50m or less
50~130m
50m or less
50~130mm
Piping between branching areas and each unit
No size after branching can exceed the size of any upstream piping.
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
9.5 × 0.8 (O type)
φ
12.7 × 0.8 (O type)
φ
15.9 × 1.0 (1/2H type)
φ
19.1 × 1.0 (1/2H type)
φ
22.2 × 1.0 (1/2H type)
φ
25.4 × 1.0 (1/2H type)
φ
28.6 × 1.2 (1/2H type)
Total capacity of indoor units after branching
Less than 16.0 kW
16.0 kW or over and less than 22.4 kW
22.4 kW or over and less than 28.0 kW
Gas pipe size
Liquid pipe size
Piping between outdoor unit and first
branch (A, a)
Piping between outdoor unit and first
branch (A2, a2)
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.
Select the piping from the following table in accordance with the total capacity of indoor units
connected downstream.
Piping between branching areas
(B2, b2)
In case of no connection
with booster unit
Outdoor unit
Showcase
Unit
cooler
Note
When connecting the booster unit,
refer to the installation manual
provided for the booster unit.
If the size of the connection pipe of the indoor unit exceeds that of the branch pipe shown in the table
above, enlarge the size of the connection pipe near the indoor unit before connecting it.
If the size of the connection pipe of the indoor unit exceeds that of the branch pipe shown in the table
above, enlarge the size of the connection pipe near the indoor unit before connecting it.
A~G, A2~E2: Liquid piping
a~g, a2~e2: Gas piping
H1~H3: Difference in height
Air
conditioner
