28
OCH733
4-5. 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 17. Then multi-
ply by the cooling capacity from Figure 7 and 8 in "4-2. 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 13. Then multiply by the heating capacity from Figure 9 and 10 in "4-2. CORRECTION BY TEMPERATURE" to
obtain the actual capacity.
(1) Capacity Correction Curve
0
50
100
150
200
250
300
350
400
450
500
550
600
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
0
50
100
150
200
250
300
350
400
450
500
550
600
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
18 [kBtu/h]
27 [kBtu/h]
36 [kBtu/h]
Capacity ratio
Piping equivalent length (ft)
Total capacity of indoor unit
Total capacity of indoor unit
Capacity ratio
Piping equivalent length (ft)
46.8 [kBtu/h]
24 [kBtu/h]
36 [kBtu/h]
48 [kBtu/h]
62.4 [kBtu/h]
Figure 13 PUMY-P36NKMU3, PUMY-P36NKMU3-BS, PUMY-HP36NKMU1 <Cooling>
Figure 14 PUMY-P48NKMU3, PUMY-P48NKMU3-BS, PUMY-HP48NKMU1 <Cooling>
