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 FDT125VNPWVH Data Book

9.2 Correction of cooling and heating capacity in relation to air flow rate control
(Fan speed)
Fan speed
Cooling
Coefficient
Heating
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.
Equivalent piping length (m)
Cooling
Heating

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
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 FDT125VNPWVH with the air flow "P-Hi", 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 =
Net cooling total capacity
of FDT125VNPWVH
(Outdoor temp. : 35℃DB
Indoor temp. : 19℃WB)
shown in table 9.1
P-Hi Hi Me
1.00 0.95 0.93
1.00 0.97 0.96
7.5 10 15 20
1 0.99 0.97 0.96
1 1 1 1
Model
12.1 1.00
× ×
Air flow : P-Hi
shown in table 9.2
- 34 -
- 46 -
Lo
0.90
0.94
25 30
0.94 0.92
1 1
5m 10m 15m
0.99 098 0.97
All models
30m
Outdoor unit is higher 20m
Outdoor unit is lower 20m
0.97 0.99
×
Height difference : 5m
(Outdoor unit : below)
shown in table 9.4
Piping length : 15m
(Gas pipe size is φ15.88)
shown in table 9.3
'22 • PAC-DB-409 '19 • PAC-DB-333
20m
0.96
11.6 kW