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VRF 50/60Hz
Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table
Capacity
index
Model
kBtu/h kW×10 TC
7
9
12
15
18
T2
24
28
32
40
48
Abbreviations:
TC: Total capacity (kW); SHC: Sensible heat capacity (kW)
Table 1-5.3: Selected indoor units
Peak heat load (kW)
Selected indoor unit
Corrected TC (kW)
Step 3: Select outdoor unit
•
Determine the required total heat load from the indoor units to the outdoor unit based on either the sum of the peak
loads of each room or the system peak load. In this example, it is determined based on the system peak load. Therefore,
the required heat load is 10.5kW.
•
Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown
in Table 1-5.4), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.5. As the sum of CIs
of the indoor units is 120, all outdoor units are potentially suitable except 8kW. Start from the smaller, which is the
10kW unit.
10
14°C WB
16°C WB
20°C DB
23°C DB
SHC
TC
SHC
22
1.5
1.4
1.8
28
1.9
1.7
2.3
36
2.5
2.1
2.9
45
3.1
2.6
3.7
56
3.9
3.0
4.6
71
4.9
3.9
5.8
80
5.5
4.4
6.6
90
6.2
5.3
7.3
112
7.7
6.4
9.1
140
9.7
7.8
11.3
Room A
3.1
BV-D12T2/N1-DA5(At)
BV-D09T2/N1-DA5(At)
3.6
Table 1-5.4: Sum of indoor unit capacity indexes
Model
BV-D12T2/N1-DA5(At)
BV-D09T2/N1-DA5(At)
Sum of CIs
Table 1-5.5: Combinations of Indoor and outdoor units
Outdoor unit capacity
Capacity
kBtu/h
28
36
42
48
56
Indoor air temperature
18°C WB
19°C WB
26°C DB
27°C DB
TC
SHC
TC
SHC
1.5
2.1
1.6
2.2
1.6
1.9
2.6
2.1
2.8
2.1
2.3
3.4
2.5
3.6
2.6
2.8
4.2
3.1
4.5
3.2
3.3
5.3
3.6
5.6
3.7
4.3
6.7
4.7
7.1
4.9
4.9
7.5
5.3
8.0
5.5
5.8
8.4
6.3
9.0
6.4
7.1
10.5
7.7
11.2
7.8
8.6
13.2
9.6
14.0
9.8
Room B
2.4
BV -D09T2/N1-DA5(At)
2.8
Capacity Index
36
28
Sum of capacity indexes of
connected indoor units
index
(standard indoor units only)
28
14 to 36.4
36
18 to 46.8
42
21 to 54.6
48
24 to 62.4
56
28 to 72.8
20°C WB
22°C WB
24°C WB
28°C DB
30°C DB
32°C DB
TC
SHC
TC
SHC
TC
2.3
1.7
2.4
1.5
2.4
3.0
2.1
3.1
2.0
3.1
3.8
2.7
4.2
2.8
3.9
4.8
3.2
4.9
3.1
5.1
5.9
3.8
6.2
3.7
6.2
7.5
4.8
7.8
4.6
7.8
8.4
5.5
8.8
5.2
8.8
9.6
6.5
9.9
6.1
9.9
11.9
8.1
12.5
7.8
12.5
14.8
9.8
15.7
9.7
15.4
Room C
2.4
BV-D09T2/N1-DA5(At)
2.8
No. of units
1
3
120
SHC
1.5
1.9
2.3
2.9
3.4
4.3
4.8
5.7
7.4
8.8
Room D
2.6
2.8
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