# Correction Of Cooling And Heating Capacity In Relation To Air Flow Rate Control (fan Speed) - Mitsubishi Electric FDT125VNVF Technical Manual

1.9.2 Correction of cooling and heating capacity in relation to air flow rate control
(fan speed)
P-Hi or Hi
Fan speed
1.00
Coefficient
Note (1) FDU and SRK models only
1.9.3 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.
Models 100 ~ 140
Equivalent piping length (m)
Heating
100 model
125 model
140 model
Cooling
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.
Models 200, 250
Equivalent piping length
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
1.9.4 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
(1)
Me
Lo
0.97
0.95
(1)
7.5
10
1
1
1
0.991
1
0.986
φ15.88
1
0.985
1.016
1.013
1.022
1.018
φ19.05
1.026
1.021
(m)
(1)
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
1.007 1.005 1.002 0.998 0.995 0.991 0.988 0.984 0.981 0.977 0.974
φ 25.4
1.012 1.008 1.002 0.996 0.990 0.984 0.978 0.972 0.966 0.960 0.953
1
0.997 0.991 0.984 0.978 0.971 0.965
φ 22.22
1
0.995 0.985 0.975 0.965 0.954 0.944
1.010 1.009 1.007 1.005 1.003 1.001 0.999 0.997 0.995 0.993 0.991
φ 28.58
1.016 1.015 1.011 1.008 1.004 1.001 0.997 0.994 0.990 0.987 0.983
φ 12.7
φ 15.88
0.20
0.25
15
20
25
30
1
1
1
0.998
0.978
0.964
0.951
0.937
0.968
0.950
0.914
0.932
0.966
0.946
0.927
0.907
1.007
1.002
0.996
0.991
1.009
1.001
0.992
0.984
1.011
1.002
0.992
0.983
20
25
30
35
40
φ 19.05
φ 22.22
φ 25.4
0.30
0.35
0.40
5m
10m
15m
0.99
0.98
0.97
202
-
-
'12 • PAC-T-174
35
40
45
50
0.998
0.993
0.993
0.988
0.924
0.910
0.897
0.883
0.896
0.878
0.860
0.842
0.888
0.868
0.849
0.829
0.985
0.980
0.974
0.969
0.975
0.967
0.958
0.950
0.973
0.964
0.954
0.945
45
50
55
60
65
0.963
0.960
0.956
0.970
0.967
0.963
0.947
0.941
0.935
0.989
0.987
0.985
0.980
0.976
0.973
φ 28.58
0.45
20m
25m
0.96
0.95
55
0.988
0.870
0.824
0.810
0.963
0.941
0.935
70
75
0.953
0.960
0.929
0.983
0.969
30m
0.94