2
2
- 14
Design of Mini Multiset
2. System Design
Material
O
Copper tubing
Outer diameter
6.35
9.52
12.7
15.88
Wall thickness
0.8
0.8
0.8
1.0
1.0
19.05
Table 2-6 Required Copper Tubing Dimensions
Unit: mm
Gas tubing size (mm)
90
°
elbow
45
°
elbow
U-shape tube bend (R60 100 mm)
Trap bend
12.7
0.30
0.23
0.90
2.30
15.88
0.35
0.26
1.05
2.80
19.05
0.42
0.32
1.26
3.20
Y-branch distribution joint
Equivalent length conversion not needed.
Ball valve for service
Equivalent length conversion not needed.
2-6. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 2-5 Straight Equivalent Length of Joints
Table 2-4 Indoor Unit Tubing Connection (
1
,
2
...
n–1
)
(mm)
ø15.88
ø9.52
Unit: mm
ø6.35
ø12.7
Gas tubing
(mm)
Liquid tubing
Indoor unit type
22 28
36
45 56
73
106
140
--
ø9.52
ø15.88
ø9.52
ø12.7
(mm)
(mm)
–
7.1
(2.5 hp)
7.1
(2.5 hp)
11.2
(4 hp)
14.0
(5 hp)
ø19.05
15.5
(6 hp)
Below kW
Over kW
Total capacity
after distribution
Tubing size
Gas tubing
Liquid tubing
hp = horsepower
Unit: mm
2-5. Tubing Size
Table 2-2 Main Tubing Size (LA)
ø19.05
6
Unit: mm
15.5
14.0
5
ø9.52
ø15.88
4
11.2
kW
System
horsepower
Gas tubing
(mm)
Liquid tubing
(mm)
Table 2-3 Main Tubing Size After Distribution (LB, LC...)
Note:
In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main
tubing size for the total capacity of the outdoor units.
