Daikin LRMEQ8AY1 [8/127] 1 selection of piping material
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Daikin LRMEQ8AY1 [8/127] 1 selection of piping material

Daikin LRMEQ8AY1 [8/127] 1 selection of piping material
6 English
6-1 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 mini-
mum 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.
d1
e
B
d2
C
H
c
H1
D1
F
E
f
D2
A
ba
Outdoor unit
Showcase
Unit
cooler
Gas piping
Liquid piping
Max. permissible
one-way piping length
(equivalent length)
Max. difference in
height between indoor
and outdoor units
LRMEQ5~20AY1
LRLEQ5~20AY1
unit below outdoor unit
unit above outdoor unit
a + b + c + d ≤ 130m (d is d1 or d2 whichever is longer)
a + b + c + d ≤ 70m (d is d1 or d2 whichever is longer)
b + c + d ≤ 30m (d is d1 or d2 whichever is longer)
H ≤ 35m (Note)
H ≤ 10m
H1 ≤ 0.5m
Max. branch piping length (actual length)
Difference in height between indoor units
Note: A trap is required at 5 m intervals from outdoor unit.
〈Refrigerant piping length〉
〈Refrigerant piping size〉
(MT (Medium Temperature)) LRMEQ5~20AY1
(Unit : mm)
Outdoor unit side
5A · 6A type
8A · 10A · 12A type
Piping size
Liquid pipe Gas pipe
50m or less 50~130m 50m or less 50~130m
15A · 20A type
Piping between branching areas
(B, b, C, c)
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.
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.
φ12.7 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ15.9 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ12.7 × 0.8 (O type) φ6.4 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ15.9 × 1.0 (1/2H type)
φ19.1 × 1.0 (1/2H type)
φ22.2 × 1.0 (1/2H type)
φ25.4 × 1.0 (1/2H type)
φ28.6 × 1.0 (1/2H type)
φ31.8 × 1.1 (1/2H type)
φ31.8 × 1.1 (1/2H type)
φ25.4 × 1.0 (1/2H type)
φ19.1 × 1.0 (1/2H type)
φ34.9 × 1.1 (1/2H type)
φ28.6 × 1.0 (1/2H type)
φ22.2 × 1.0 (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 and less than 25.0 kW
25.0 kW or over and less than 31.0 kW
31.0 kW or over
Gas pipe size Liquid pipe size
(LT (Low Temperature)) LRLEQ5~20AY1
(Unit : mm)
Outdoor unit side
5A · 6A type
8A · 10A · 12A type
Piping size
Liquid pipe Gas pipe
50m or less 50~70m 25m or less 25~70mm
15A · 20A type
Piping between branching areas
(B, b, C, c)
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.
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.
φ12.7 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ15.9 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ12.7 × 0.8 (O type) φ6.4 × 0.8 (O type)
φ9.5 × 0.8 (O type)
φ12.7 × 0.8 (O type)
φ15.9 × 1.0 (1/2H type)
φ19.1 × 1.0 (1/2H type)
φ22.2 × 1.0 (1/2H type)
φ25.4 × 1.0 (1/2H type)
φ28.6 × 1.0 (1/2H type)
φ31.8 × 1.1 (1/2H type)
φ31.8 × 1.1 (1/2H type)
φ25.4 × 1.0 (1/2H type)
φ19.1 × 1.0 (1/2H type)
φ34.9 × 1.1 (1/2H type)
φ28.6 × 1.0 (1/2H type)
φ22.2 × 1.0 (1/2H type)
Total capacity of indoor units after branching
Less than 2.3 kW
2.3 kW or over and less than 4.4 kW
4.4 kW or over and less than 6.4 kW
6.4 kW or over and less than 7.8 kW
7.8 kW or over and less than 10.8 kW
10.8 kW or over and less than 13.4 kW
13.4 kW or over
Gas pipe size Liquid pipe size
01_EN_3P248411-2.fm Page 6 Monday, June 8, 2009 12:28 PM

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