Mitsubishi Electric PLA-RP·BA(2) Technical Data Book page 34

8-3. CAPACITY CORRECTION CURVES
Cooling and heating capacity is lowered according to pipe length. Capacity can be obtained by referring to the capacity
curves below. When the diameter of gas pipe is one size smaller than standard diameter, cooling capacity is lowered com-
paring to the standard diameter. The lowered capacity can be obtained by referring to capacity curves for gas pipe which is
one size smaller than standard size.
Corrected pipe length (m) = actual pipe length (m) + number of bends x 0.3 (m)
[Sample calculation]
Indoor unit RP60 o 2 units (Twin system)
Outdoor unit HRP125 o 1
• Condition Using existing pipes.
• Outdoor unit side
Liquid pipe [12.7 / Gas pipe [19.05
pipe length (A) 20m
• Indoor unit side
Liquid pipe [9.52 / Gas pipe [15.88
pipe length (B) 20m + (C) 15m
1) Farthest piping length
2) Corrected piping length 35m + 0.3 o 10 = 38m
3) Capacity correction
4) Capacity
1 Capacity curves for PUHZ-HRP · HA(2) model <Standard size>
100
95
90
85
80
75
Note: The permitted pipe length is up to 80m.
70
5 10 15
2 When gas pipe is one size larger than standard size for PUHZ-HRP71-125
1 Capacity can be obtained by referring to capacity curves of standard size.
20m + 15m = 35m
Number of bends : 10
Outdoor unit side's gas pipe [19.05
Standard [15.88 → 1 size up
Refer to 1Capacity curves <Standard size>
Cooling capacity = Standard cooling capacity o 0.89
Heating capacity = Standard heating capacity o 0.98
20 25 30 35 40
Corrected pipe length [m]
45 50 55 60 65
34
Heating HRP71-125
Cooling HRP71 model
Cooling HRP100 model
Cooling HRP125 model
70 75 80
.
Cooling
Heating