Part 1 - Gener
al In
forma
tion
Amazon Unitario Top Discharge
11
Table 1-5.2: Extract from medium static pressure duct (KPDF) cooling capacity table
Model Capacity
index
Indoor air temperature
14°C WB
16°C WB
18°C WB
19°C WB
20°C WB
22°C WB
24°C WB
20°C DB
23°C DB
26°C DB
27°C DB
28°C DB
30°C DB
32°C DB
TC SHC TC SHC TC SHC TC SHC TC SHC TC SHC TC SHC
KPDF
22
1.5 1.4
1.8
1.5
2.1
1.6
2.2
1.6
2.3
1.7
2.4
1.5
2.4
1.5
28
1.9 1.7
2.3
1.9
2.6
2.1
2.8
2.1
3.0
2.1
3.1
2.0
3.1
1.9
36
2.5 2.1
2.9
2.3
3.4
2.5
3.6
2.6
3.8
2.7
4.2
2.8
3.9
2.3
45
3.1 2.6
3.7
2.8
4.2
3.1
4.5
3.2
4.8
3.2
4.9
3.1
5.1
2.9
56
3.9 3.0
4.6
3.3
5.3
3.6
5.6
3.7
5.9
3.8
6.2
3.7
6.2
3.4
71
4.9 3.9
5.8
4.3
6.7
4.7
7.1
4.9
7.5
4.8
7.8
4.6
7.8
4.3
80
5.5 4.4
6.6
4.9
7.5
5.3
8.0
5.5
8.4
5.5
8.8
5.2
8.8
4.8
90
6.2 5.3
7.3
5.8
8.4
6.3
9.0
6.4
9.6
6.5
9.9
6.1
9.9
5.7
112
7.7 6.4
9.1
7.1 10.5 7.7 11.2 7.8 11.9 8.1 12.5 7.8 12.5 7.4
140
9.7 7.8 11.3 8.6 13.2 9.6 14.0 9.8 14.8 9.8 15.7 9.7 15.4 8.8
Abbreviations:
TC: Total capacity (kW); SHC: Sensible heat capacity (kW)
Table 1-5.3: Selected indoor units
Room A
Room B
Room C
Room D
Peak heat load (kW)
10.6
10.7
5.1
5.1
Selected indoor unit
KPDF-140 DN4.0
KPDF-140 DN4.0
KPDF-56 DN4.0
KPDF-56 DN4.0
Corrected TC (kW)
13.2
13.2
5.3
5.3
Room E
Room F
Room G
Room H
Peak heat load (kW)
9.1
9.0
4.2
4.2
Selected indoor unit
KPDF-112 DN4.0
KPDF-112 DN4.0
KPDF-45 DN4.0
KPDF-45 DN4.0
Corrected TC (kW)
10.5
10.5
4.2
4.2
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 50.7kW.
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 706, outdoor units from 20HP to 32HP are potentially suitable. Start from the smallest, which is
the 20HP unit.
Table 1-5.4: Sum of indoor unit capacity indexes
Model
Capacity Index
No. of units
KPDF-140 DN4.0
140
2
KPDF-112 DN4.0
112
2
KPDF-56 DN4.0
56
2
KPDF-45 DN4.0
45
2
Sum of CIs
706
