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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-7. Tubing Size
Table 1-2 Main Tubing Size (LA)
4 hp
5 hp
6 hp
System
horsepower
horsepower
4
5
6
Gas tubing
(mm)
(mm)
ø15.88
ø19.05
Liquid tubing
(mm)
(mm)
ø9.52
Table 1-3 Main Tubing Size After Distribution (LB, LC...)
Total capacity
after distribution
after distribution
Below kW
7.1
(2.5 hp)
12.1
(4 hp)
14.0
(5 hp)
15.5
(6 hp)
Over kW
—
7.1
(2.5 hp)
Tubing size
Gas tubing (mm)
ø12.7
ø15.88
ø19.05
Liquid tubing (mm)
ø9.52
ø9.52
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.
Table 1-4 Indoor Unit Tubing Connection (
1
,
2
...
n-1
)
Indoor unit type
22
28
36
45
56
73
90
106
140
160
Gas tubing
(mm)
ø12.7
ø15.88
Liquid tubing
(mm)
ø6.35
ø9.52
1-8. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-5 Straight Equivalent Length of Joints
Gas tubing size (mm)
12.7
15.88
19.05
90° elbow
0.30
0.35
0.42
45° elbow
0.23
0.26
0.32
U-shape tube bend (R60 – 100 mm)
0.90
1.05
1.26
Trap bend
2.30
2.80
3.20
Y-branch distribution joint
Equivalent length conversion not needed.
Equivalent length conversion not needed.
e
c
i
v
r
e
s
r
o
f
e
v
l
a
v
ll
a
B
Table 1-6 Required Copper Tubing Dimensions
Unit: mm
Material
O
Copper tubing
Outer diameter
6.35
9.52
12.7
15.88
19.05
Wall thickness
0.8
0.8
0.8
1.0
1.2
Unit: mm
Unit: mm
hp = horsepower
hp = horsepower
hp = horsepower
Unit: mm
Note :
If the system consists of only one indoor unit with an
outdoor 6HP, the main tube of the unit (LA) should be
ø19.05. Convert ø19.05 to ø15.88 using a reducer
(field supply) close to the indoor unit and then make the
connection.
TD831155-04_MINI VRF.indb 5
TD831155-04_MINI VRF.indb 5
2014/05/09 15:29:01
2014/05/09 15:29:01
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