Kaysun Mini Amazon III, Engineering Data Book

Page: 106 / 140

V6R VRF 50Hz
Part 3 - S
yst
em Design and Ins
talla
tion
Mini Amazon III Series
105
3.5 Refrigerant Piping Selection Example
The example below illustrates the piping selection procedure for a system consisting of one outdoor unit (16kW) and 6
indoor units. The system’s equivalent length of all liquid pipes and gas pipes is in excess of 90m.
Figure 3-3.4: Refrigerant piping selection example
Legend
L
1
Main pipe
L
2
to L
5
Indoor main pipes
a to f Indoor auxiliary pipes
A to E Indoor branch joints
Figures in parentheses indicate indoor
unit capacity indexes.
Step 1: Select indoor auxiliary pipes

Indoor units N1~ N5 are of capacity 2.8kW, N6 is 2.2kW. Refer to Table 3-3.6. Indoor auxiliary pipe a, b, c, d, e, f is
Φ12.7 / Φ6.35.
Step 2: Select indoor main pipes and indoor branch joints B to E

Th e indoor units (N
1
and N
2
) downstream of indoor branch joint B have total capacity of 28 x 2 = 56. Refer to Table 3-3.4.
Indoor main pipe L
2
is Φ15.9 / Φ9.53. Indoor branch joint B is KCMI 112.

The indoor units (N
3
and N
4
) downstream of indoor branch joint D have total capacity of 28 x 2 = 56. Refer to Table 3-3.4.
Indoor main pipe L
4
is Φ15.9 / Φ9.53. Indoor branch joint D is KCMI 112.

The indoor units (N
5
and N
6
) downstream of indoor branch joint E have total capacity of 22+28 = 50. Refer to Table 3-3.4.
Indoor main pipe L
5
is Φ15.9 / Φ9.53. Indoor branch joint E is KCMI 112.

The indoor units (N
3
to N
6
) downstream of indoor branch joint C have total capacity of 28 x 3+ 22 = 106. Refer to Table
3-3.4. Indoor main pipe L
3
is Φ15.9 / Φ9.53. Indoor branch joint C is KCMI 112.
Step 3: Select main pipe and indoor branch joint A

The indoor units (N
1
to N
6
) downstream of indoor branch joint A have total capacity of 28 x 5+ 22 = 162. The system’s
equivalent length of all liquid pipes and gas pipes is in excess of 90m. The capacity of the outdoor unit is 16kW. Refer
to Tables 3-3.4 and 3-3.5. Main pipe L
1
is Φ22.2 / Φ9.53, Indoor branch joint A is KCMI 212.
3.6 Bran
ch
Joints
Branch joint design should take account of the following:

U-shaped branch joints should be used – tee joints are not suitable. Branch joint dimensions are given in Tables 3-3.7.

To ensure even distribution of refrigerant, branch joints should not be installed within 500mm of a 90° bend, another
branch joint or the straight section of piping leading to an indoor unit, with the minimum 500mm being measured
from the point where the branch joint is connected to the piping, as shown in Figure 3-3.5.