Engineering Manual

B-124
0 20 40 60 80 100 120 140 160 180 200 220 240 260
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)
24 [kBTU/h]
36 [kBTU/h]
48 [kBTU/h]
62.4 [kBTU/h]
0 20 40 60 80 100 120 140 160 180 200 220 240 260
0.70
0.75
0.80
0.85
0.90
0.95
1.00
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)
30 [kBTU/h]
45 [kBTU/h]
60 [kBTU/h]
78 [kBTU/h]
Figure 13 MXZ-8C48NA <Cooling>
Figure 14 MXZ-8C60NA <Cooling>
6-4. CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING
(1) During cooling, obtain the ratio (and the equivalent piping length) of the outdoor units rated capacity and the total in-use
indoor capacity, and find the capacity ratio corresponding to the standard piping length from Figure 13 to 16. Then multiply
by the cooling capacity from Figure 7 and 8 in "6-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity.
(2) During heating, find the equivalent piping length, and find the capacity ratio corresponding to standard piping length from
Figure 17 to 18. Then multiply by the heating capacity from Figure 9 to 12 in "6-2. CORRECTION BY TEMPERATURE" to
obtain the actual capacity.
(1) Capacity Correction Curve