Correction Of Cooling And Heating Capacity In Relation To Air Flow Rate Control (Fan Speed); Correction Of Cooling And Heating Capacity In Relation To One Way Length Of Refrigerant Piping; Height Difference Between The Indoor Unit And Outdoor Unit - Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual

2.8.2 Correction of cooling and heating capacity in relation to air flow rate control
(Fan speed)
Fan speed
Coefficient
2.8.3 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.
(1) Models FDC100 - 140
Equivalent piping length (m)
Heating
FDC100 model
FDC125 model
FDC140 model
Cooling
FDC100 model
FDC125 model
FDC140 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.
(2) Models FDC200, 250
Equivalent piping length
Heating
FDC 200 model
FDC 250 model
FDC 200 model
Cooling
FDC 250 model
FDC 200 model
FDC 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

2.8.4 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
Piping length limitations
Item
Max. one way piping length
Max. vertical height difference
Note (1) Values in the table indicate the one way piping length between the indoor and outdoor units.
P-Hi or Hi Me
1.00 0.97 0.95
(1)
7.5
φ15.88
1.016
1.022
φ19.05
1.026
(m) 7.5 10
(1)
1 0.998 0.995 0.991 0.988 0.984 0.981 0.977 0.974 0.970 0.967
1 0.997 0.991 0.984 0.978 0.971 0.965
φ22.22
1 0.995 0.985 0.975 0.965 0.954 0.944
– –
φ25.4
– –
– –
φ28.58
– –
φ 12.7 φ 15.88
0.20 0.25
Model
Lo
10 15 20
1 1 1 1
1 0.991 0.978 0.964 0.951
1 0.986 0.968 0.950 0.932
1 0.985 0.966 0.946 0.927
1.013 1.007 1.002 0.996
1.009 1.001
1.018 0.992
1.021 1.011 1.002 0.992
15 20 25 30 35
0.988 0.984 0.981 0.977 0.974
– – – –
– – – – 0.978 0.972 0.966 0.960 0.953
– – – – 0.999 0.997 0.995 0.993 0.991
0.997 0.994 0.990 0.987 0.983
– – – –
φ 19.05 φ 22.22
0.30 0.35
5m 10m
0.99 0.98
FDC100 - 140
50m
Outdoor unit is higher 30m
Outdoor unit is lower 15m
302
- -
'19 • PAC-T-327
25 30 35 40
1 0.998 0.998 0.993
0.937 0.910
0.924
0.914 0.896 0.878
0.907 0.888 0.868
0.991 0.985 0.980
0.984 0.975 0.967
0.983 0.973 0.964
40 45 50 55
0.963
– – – –
– – – –
0.970
0.947
0.989
0.980
φ 25.4 φ 28.58
0.40 0.45
15m 20m
0.97 0.96
FDC200, 250
45 50 55
0.993 0.988 0.988
0.897 0.883 0.870
0.860 0.842 0.824
0.849 0.829 0.810
0.974 0.969 0.963
0.958 0.950 0.941
0.954 0.945 0.935
60 65 70 75
0.960 0.956 0.953
– – – –
– – – –
0.967 0.963 0.960
0.941 0.935 0.929
0.987 0.985 0.983
0.976 0.973 0.969
25m 30m
0.95 0.94
70m