Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 41

1.8.2 Correction of cooling and heating capacity in relation to air flow rate control
(fan speed)
Fan speed
Coefficient
1.8.3 Correction of cooling and heating capacity in relation to one way length of
refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way equivalent piping length between the indoor
and outdoor units.
Equivalent piping length (m)
Heating
71 model
100 model
125 model
140 model
Cooling
71 model
100 model
125 model
140 model
Equivalent piping length (m)
Heating
71 model
100 model
125 model
140 model
Cooling
71 model
100 model
125 model
140 model
Note (1) Calculate the equivalent length using the following formula.
However, install the piping so that the piping length is within +5 m of the limit length (actual length) for the respective types.
• Equivalent Length =Actual Length + (Equivalent bend length x number of bends in the piping.)
Equivalent length per bend.
Gas Pipe Diameter (mm)
Equivalent Bend Length
1.8.4 Height difference between the indoor unit and outdoor unit
When the outdoor unit is located below indoor units in cooling mode, or when the outdoor unit is located above indoor units in
heating mode, the correction coefficient mentioned in the below table should be subtracted from the value in the above table.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
Adjustment coefficient
P-Hi or Hi Me
1.00 0.97
(1)
7.5
1
1
1
φ15.88
1
1
1.008
1.016
φ19.05
1.022
1.026
(1)
60
0.983
ー
0.856
φ15.88
0.806
0.790
ー
0.959
φ19.05
0.935
0.928
φ 12.7 φ 15.88
0.20
Lo
0.95
10 15 20 25
1 1 1
1
0.996 0.989 0.982 0.975
0.991 0.978 0.964 0.951
0.986 0.968 0.950 0.932
0.985 0.966 0.946 0.927
1.006 1.003 1 0.997
1.013 1.007 1.002 0.996
1.018 1.009 1.001 0.992
1.021 1.011 1.002 0.992
65 70 75 80
0.983 0.978 0.978 0.973
ー ー ー ー
0.843 0.829 0.816 0.803
0.788 0.770 0.752 0.734
0.771 0.751 0.732 0.712
ー ー ー ー
0.955 0.951 0.948 0.944
0.929 0.924 0.919 0.912
0.920 0.913 0.907 0.900
φ 19.05
0.25 0.30
5m 10m
0.99 0.98
0
- -
'10 • PAC-DB-136
'12 • PAC-T-178
30 35 40 45
0.998 0.998 0.993 0.993
0.954 0.947
0.968 0.961
0.937 0.924 0.910 0.897
0.914 0.896 0.878 0.860
0.907 0.888 0.868 0.849
0.994 0.988 0.985
0.991
0.991 0.985 0.980 0.974
0.984 0.975 0.967 0.958
0.983 0.973 0.964 0.954
85 90 95 100
0.973 0.968 0.968 0.963 0.963
ー ー ー ー
0.789 0.776 0.762 0.749 0.736
0.716 0.698 0.680 0.662
0.693 0.673 0.654 0.634
ー ー ー ー
0.940 0.936 0.932 0.929 0.926
0.908 0.902 0.897 0.892 0.887
0.894 0.888 0.882 0.876 0.870
15m 20m 25m
0.97 0.96 0.95
50 55
0.988 0.988
0.933
0.940
0.883 0.870
0.842 0.824
0.829 0.810
0.982 0.979
0.969 0.963
0.950 0.941
0.945 0.935
105
ー
0.644
0.615
ー
30m
0.94