17
5-1-2. Correcting Capacity for Changes in the Length of Refrigerant Piping
To obtain the ratio (and the corrected piping length) of the outdoor units rated capacity and the total in-use indoor capacity, first
find the capacity ratio corresponding to the standard piping length from Fig. 3, Fig. 4 and then multiply by the capacity from
Fig.1-1, 1-2, Fig. 2-1, 2-2 to obtain the actual capacity.
(1) Capacity correction factor
Fig. 3 Cooling capacity correction curve
(2) Method for Obtaining the Corrected Piping Length
Corrected piping length = (Actual piping length between outdoor unit and the farthest indoor unit) + (0.30
o
number of bends in the piping) (m)
2.2 (15.7%)
7.0 (50%)
10.5 (75%)
14.0 (100%)
18.5 (132%)
0.65
20
40
60
80
20
40
60
80
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Cooling
Capacity
(ratio)
[%]
Total rated capacity of indoor units (kW)
Corrected piping length (m)
0.9
20
40
60
80
0.95
1
Heating
Capacity
(ratio)
[%]
Corrected piping length (m)
Fig. 4 Heating capacity correction curve
