Correcting Capacity For Changes In The Length Of Refrigerant Piping; Capacity Correction Curve - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

4-4. CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING

• 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 11. Then multiply by
the cooling capacity from Figure 7 and 8 in "4-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity.
• During heating, find the equivalent piping length, and find the capacity ratio corresponding to standard piping length from
Figure 12. 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

Figure 11 PUMY-P250YBM
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 20
Figure 12 PUMY-P250YBM
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 20
OCH760
<Cooling>
40 60 80
Piping equivalent length (m)
<Heating>
40 60 80
Piping equivalent length (m)
19
100 120 140
100 120 140
Total capacity of indoor unit
14.0
21.0
28.0
36.4
160 180
160 180