Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 211

2.8.2 Correction of cooling and heating capacity in relation to air flow rate control
(fan speed)
Fan speed P-Hi or Hi
1.00
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.
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.
• 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.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model FDU100VNVF1 with the air flow "P-High", the piping length of 15m, the outdoor
unit located 5m lower than the indoor unit, indoor wet-bulb temperature at 19.0℃ and outdoor dry-bulb temperature 35℃ is
Net cooling capacity =
Me Lo
0.97 0.95
(1)
7.5
1
1
1
φ15.88
1
1.016
1.022
φ19.05
1.026
φ 12.7
0.20
Model
×
10.0
Net cooling total capacity Air flow : P-Hi
shown in table 2.8.2
of FDU100VNVF1
(Outdoor temp. : 35℃DB
Indoor temp. : 19℃WB)
shown in table 2.8.1
10 15 20 25
1 1 1 1
0.991 0.978 0.964 0.951
0.968 0.950
0.986 0.932
0.985 0.966 0.946 0.927
1.013 1.007 1.002 0.996
1.018 1.009 1.001 0.992
1.011 1.002 0.992
1.021
φ 15.88 φ 19.05
0.25 0.30
5m 10m
0.99 0.98
Outdoor unit is higher 30m
Outdoor unit is lower 15m
×
1.00 0.978
Piping length :15m
(Gas pipe size is φ15.88)
shown in table 2.8.3
210
- -
30 35 40 45
0.998 0.998 0.993 0.993
0.937 0.924 0.910 0.897
0.914 0.896 0.878 0.860
0.907 0.888 0.868 0.849
0.991 0.985 0.980 0.974
0.984 0.975 0.967 0.958
0.983 0.973 0.964 0.954
15m 20m
0.97 0.96
100, 125, 140
50m
. = .
×
9.7kW
0.99
Height diff. :5m
(Outdoor unit : below)
shown in table 2.8.4
'12 • PAC-T-178
50 55
0.988 0.988
0.883 0.870
0.842 0.824
0.829 0.810
0.969 0.963
0.941
0.950
0.945 0.935
25m 30m
0.95 0.94