Panasonic U-72MF1U9 Technical Data Manual page 30

1. Model Selecting and Capacity Calculator
Rated performance values
Type
72
96
1-10. Capacity Correction Graph According to Tubing Length and Elevation Difference
Capacity change characteristics
<Cooling>
Base capacity
change rate
164
1
131
98
96
66 98
100
33
%
2
0
–33
–66
–98
3
–131
0 0 33 66 98 33 66 98
<Heating>
4
Base capacity
change rate
164
131
98
5
66
33
0
–33
6
–66
–98
–131
0 33 66 98 131 164 197 230 262 295 328 361 394 427 459 492
7
NOTE
The positive side for the elevation difference indicates that
the outdoor unit is installed at a higher position than the
indoor units. The negative side indicates the opposite.
8
Item Cooling
Cooling capacity Power consumption
BTU/h(kW)
72,000(21.1)
96,000(28.1)
92 90 88 86 84 82 80
94
*1
131 164 197 230 262 295 328 361 394 427 459 492 131 164 197 230 262 295 328 361 394 427 459 492
Equivalent length (ft)
Equivalent length (ft)
Heating
Heating capacity Power consumption
kW BTU/h(kW)
5.30 81,000(23.7)
7.75 108,000(31.6)
78 76
*1 Sample calculations
(System: 8 Ton, 164ft equivalent length, 49ft elevation
difference
The cooling capacity and heating capacity for this system are
found as shown below.)
●
Cooling operation
From the graph, the base capacity change rate is found to be
92.0%.
96,000 BTU/h
(28.1kW 92.0% = 25.8kW)
×
● Heating operation
From the graph, the base capacity change rate is found to be
97.2%.
Because the calculation result exceeds 97.2%, the capacity
change rate is 97.2%.
108,000 BTU/h
(31.6kW 97.2% = 30.7kW)
×
2 - 16
Design of 3WAY VRF SYSTEM
kW
5.79
8.6
92.0% = 88,320 BTU/h
×
Capacity change rate is 92.0%.
Cooling capacity is
88,320 BTU/h (28.1 kW)
97.2% = 105,000 BTU/h
×
Heating capacity is
105,000 BTU/h (30.7 kW)