BGH BV-V28W/DHN1 Manual page 12

• The number of connected indoor units is 4 and the maximum number of connected indoor units on the 10kW outdoor
unit is 6, so the number of connected indoor units is within the limitation.
• Calculate the corrected capacity of the outdoor unit:
a) The sum of the indoor unit CIs is 120 and the CI of the 10kW outdoor unit is 100, so the combination ratio is 120 /
100 = 120%.
b) Using the outdoor unit's cooling capacity table, interpolate to obtain the capacity ("B") corrected for outdoor air
temperature, indoor air temperature, and combination ratio. Refer to Tables 1-5.6 and 1-5.7.
Table 1-5.6: Extract from Table 2-7.2 BV-V36W/DHN1(At)
cooling capacity
Outdoor
CR
temp.
(°C DB)
120%
110%
c) Find the correction factor for piping length and level difference ("K1")
Figure 1-5.3: Atom rate of change in cooling capacity
d) Calculate the corrected capacity of BV-V36W/DHN1(At) ("C") by using K1:
• The corrected capacity 10.1 kW is lower than required total heat load 10.5kW, so selection is not complete. Step 3
should be repeated from the point where the outdoor unit capacity is provisionally selected.
Repeat 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,
Indoor air temp.
(°C DB / °C WB)
air
25.8 / 18.0
TC
kW
10.56
31
10.44
33
10.22
35
31
10.33
33
10.22
35
10.00
C = B × K1 = 10.44 × 0.968 =10.1kW
Table 1-5.7: Cooling capacity calculated by interpolation
CR
PI
kW
2.50
2.59
120%
2.68
2.44
110%
2.57
2.66
Indoor air temp.
Outdoor
(°C DB / °C WB)
air
25.8 / 18.0
temp.
TC
(°C DB)
kW
10.44
33
B =10.44
33
10.22
PI
kW
2.59
2.57
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