Mitsubishi Electric PLA-RP-BA3 Technical Data Book page 68

8-1-3. 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 1 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
1 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 RP125 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-RP · HA2 model <Standard size>
100
95
90
85
80
75
Note: The permitted pipe length is up to 55m for RP35, 50, 60, 71 model.
The permitted pipe length is up to 80m for RP100 ~ 140 model.
70
5 10 15
20m + 15m = 35m
Number of bends : 10
Outdoor unit side's gas pipe [19.05
Standard [15.88 → 1 size up
Refer to 1 Capacity 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]
Cooling RP35, 60 models
Cooling RP71 model
45 50 55 60 65
68
Heating RP35, 50, 60,
71, 100, 125 and 140
models
(Up to 55m for RP35,
50, 60, 71 models)
Cooling RP50, 100 models
Cooling RP125 model
Cooling RP140 model
70 75 80
Cooling
Heating