R410A DC Inverter VRF V4 Plus W Series 50Hz
MCAC-VTSM-2016-04
12 Selection Procedure
1.3 Outdoor unit selection
Allowable combinations are indicated in INDOOR UNIT COMBINATION TOTAL CAPACITY INDEX TABLE.
In general, outdoor unit can be selected as follows though the location of the unit, zoning and usage of the
rooms may be considered.
The indoor and outdoor unit combination is determined that the sum of indoor unit capacity index is nearest to
and smaller than the capacity index at 100% combination ratio of each outdoor unit. Up to 13~20 indoor units
can be connected to one outdoor unit. It is recommended to choose a larger outdoor unit if the installation
space is large enough.
If the combination ratio is greater than 100%, the indoor unit selection shall be reviewed by using actual
capacity of each indoor unit.
INDOOR UNIT COMBINATION TOTAL CAPACITY INDEX TABLE
Outdoor Unit
Indoor Unit Combination Ratio (kW)
130%
120%
110%
100%
90%
80%
70%
60%
50%
8HP
32.8
30.2
27.7
25.2
22.7
20.1
17.6
15.1
12.6
10HP
36.4
33.6
30.8
28.0
25.2
22.4
19.6
16.8
14.0
12HP
43.6
40.2
36.9
33.5
30.2
26.8
23.5
20.2
16.8
16HP
65.52
60.48
55.44
50.4
45.36
40.32
35.28
30.24
25.2
18HP
69.2
63.8
58.5
53.2
47.9
42.6
37.2
31.9
26.6
20HP
72.8
67.2
61.6
56.0
50.4
44.8
39.2
33.6
28.0
22HP
80.0
73.8
67.7
61.5
55.4
49.2
43.1
36.9
30.8
24HP
87.1
80.4
73.7
67.0
60.3
53.6
46.9
40.2
33.5
26HP
101.92
94.08
86.24
78.4
70.56
62.72
54.88
47.04
39.2
28HP
105.56
97.44
89.32
81.2
73.08
64.96
56.84
48.72
40.6
30HP
109.2
100.8
92.4
84.0
75.6
67.2
58.8
50.4
42
32HP
116.35
107.4
98.45
89.5
80.55
71.6
62.65
53.7
44.75
34HP
123.5
114
104.5
95
85.5
76
66.5
57
47.5
36HP
130.65
120.6
110.55
100.5
90.45
80.4
70.35
60.3
50.25
INDOOR UNIT CAPACITY INDEX
Unit Size
Model
22
Model
28
Model
36
Model
45
Model
56
Model
71
Model
80
Model
90
Model
112
Model
140
Capacity Index (kW)
2.2
2.8
3.6
4.5
5.6
7.1
8.0
9.0
11.2
14.0
Unit Size
Model
160
Model
200
Model
250
Model
280
Capacity Index (kW)
16
20
25
28
1.4 Actual performance date
Use OUTDOOR UNIT CAPACITY TABLES.
Determine correct table according to the outdoor unit model and combination ratio.
Enter the table at given indoor and outdoor temperature and find the outdoor unit capacity and power input.
The individual indoor unit capacity (power input) can by calculated as follows.
IUC=OUC × INX/TNX
Where,
IUC: Each indoor unit capacity
OUC: Outdoors unit capacity
INX: Each indoor unit capacity index
TNX: Total capacity index
Then, correct the indoor unit capacity according to the piping length.
If the corrected capacity is smaller than the load, the size of indoor unit has to be increased and repeat the
same selection procedure.