Trane 4TVH0086FE000AA Service Manual page 14

Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table
Capacity
Model
T2
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)
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 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.
14°C WB 16°C WB
index
20°C DB 23°C DB
TC SHC TC
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
10.6
4TVD0048EF000AA
13.2
Room E
9.1
4TVD0038EF000AA
10.5
Table 1-5.4: Sum of indoor unit capacity indexes
Model
4TVD0048EF000AA
4TVD0038EF000AA
4TVD0018EF000AA
4TVD0015EF000AA
Sum of CIs
Indoor air temperature
18°C WB 19°C WB
26°C DB 27°C DB
SHC 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
10.7
4TVD0048EF000AA
13.2
Room F
9.0
4TVD0038EF000AA
10.5
Capacity Index
140
112
56
45
706
13
20°C WB 22°C WB
28°C DB 30°C DB
TC SHC TC SHC
2.3 1.7 2.4 1.5
3.0 2.1 3.1 2.0
3.8 2.7 4.2 2.8
4.8 3.2 4.9 3.1
5.9 3.8 6.2 3.7
7.5 4.8 7.8 4.6
8.4 5.5 8.8 5.2
9.6 6.5 9.9 6.1
11.9 8.1 12.5 7.8
14.8 9.8 15.7 9.7
Room C
5.1
4TVD0018EF000AA 4TVD0018EF000AA
5.3
Room G
4.2
4TVD0015EF000AA 4TVD0015EF000AA
4.2
No. of units
2
2
2
2
24°C WB
32°C DB
TC SHC
2.4 1.5
3.1 1.9
3.9 2.3
5.1 2.9
6.2 3.4
7.8 4.3
8.8 4.8
9.9 5.7
12.5 7.4
15.4 8.8
Room D
5.1
5.3
Room H
4.2
4.2