Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual page 136

(3) Correction of cooling and heating capacity in relation to air flow rate control (fan speed)
Coefficient: 1.00 at High, 0.97 at Middle, 0.95 at Low
(4) 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.
(i) Models 40~60
Equivalent piping length
(1)
Heating
40 model
Cooling 50 model
60 model
Note (1) Calculate the equivalent length using the following formula.
However, install the piping so that the equivalent length is within +5 m of the piping distance limit (actual length) for each respective piping system.
(ii) Models 71 ~ 140
Equivalent piping length
(1)
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.
(iii) Models 200, 250
Equivalent piping length
(1)
Heating
200 model
250 model
200 model
Cooling
250 model
200 model
250 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
m 7.5 10
1 0.995
1 0.997
1 0.996
1 0.995
(m)
7.5
1
1 0.996
1 0.991
1 0.986
1 0.985
1.008 1.006
1.016 1.013
1.022 1.018
1.026 1.021
(m)
7.5 10 15
1 0.998 0.995 0.991 0.988 0.984 0.981 0.977 0.974 0.970 0.967
1 0.998 0.995 0.991 0.988 0.984 0.981 0.977 0.974 0.970 0.967
1 0.996 0.990 0.984 0.978 0.972 0.966 0.960 0.954 0.948 0.942
0.993 0.990 0.984 0.977 0.971 0.964 0.958
0.988 0.983 0.973 0.963 0.953 0.943 0.933
1.003 1.002 1
1.004 1.003 0.999 0.996 0.992 0.989 0.985 0.982 0.978 0.975 0.971
0.20 0.25
15 20 25
0.992 0.990 0.987
0.991 0.985 0.980
0.989 0.981 0.973
0.986 0.977 0.967
10 15 20 25
1 1 1 1
0.989 0.982 0.975
0.978 0.964 0.951
0.968 0.950 0.932
0.966 0.946 0.927
1.003 1 0.997
1.007 1.002 0.996
1.009 1.001 0.992
1.011 1.002 0.992
20 25 30 35 40
0.998 0.996 0.994 0.992 0.990 0.988 0.986 0.984
φ22.22
0.35
0.30
128
- -
30 35 40
0.984 0.981 0.978
0.974 0.968 0.962
0.966 0.958 0.951
0.958 0.948 0.939
30 35 40 45
0.998 0.998 0.993 0.993
0.968 0.961 0.954 0.947
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 0.991 0.988 0.985
0.991 0.985 0.980 0.974
0.984 0.975 0.967 0.958
0.983 0.973 0.964 0.954
45 50 55 60
0.963
0.963
0.936
– – – – –
– – – – –
0.982
0.968
φ25.4 φ28.58
0.40 0.45
45 50 55
0.975 0.972 0.970
0.956 — —
0.943 — —
0.930 — —
50 55
0.988 0.988
0.940 0.933
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
65 70 75
0.960 0.956 0.953
0.960 0.956 0.953
0.930 0.924 0.918
– – –
– – –
0.980 0.978 0.976
0.964 0.961 0.957