Correction By Refrigerant Piping Length - Mitsubishi Electric Y Series Manual

2-3 Correction by refrigerant piping length

To obtain a decrease in cooling/heating capacity due to refrigerant piping extension, multiply by the capacity
correction factor based on the refrigerant piping equivalent length in the table below.
• Cooling capacity correction
PUMY-71VM
1.0
0.9
0.8
0.7
0 10 20
Piping equivalent length (m)
• Heating capacity correction
PUMY-71VM
1.0
0.9
0.8
0.7
0 10 20
Piping equivalent length (m)
• How to obtain piping equivalent length
PUMY-71VM
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.3
PUMY-125VM
Equivalent length = (Actual piping length to the farthest indoor unit) + (0.35
35
53
71
93
30 40 50 60
40 50 60
30
PUMY-125VM
1.0
0.9
0.8
0.7
5 10 20 30
Piping equivalent length (m)
PUMY-125VM
1.0
0.9
0.8
0.7
0 10 20
Piping equivalent length (m)
number of bent on the piping)m
number of bent on the piping)m
8
63
94
125
163
40 50 60 70 75
40 50 60
30