Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 523

Table of bypass factor
Model
Item
Air flow Hi
(2) Correction of cooling capacity in relation to flow rate control (fan speed)
Coefficient: 1.00 at High, 0.95 at Low
(3) Correction of cooling capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling capacity in relation to the one way equivalent piping length between the indoor and outdoor
units.
Equivalent length m
(1)
208 type
258 type
308 type
Note (1) Equivalent piping length can be obtained by calculating as follows.
208, 258, 308 series [φ15.88(5/8")]: Equivalent piping length = Real piping length + (0.10 × Number or bends in piping)
[Equivalent piping length < Limitation length of piping + 5m]
(4) When the outdoor unit is located at a lower height than the indoor unit in cooling operation, the following values
should be subtracted from the values in the above table.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
Adjustment coefficient
Piping length limitations
Model
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 capacity
Example : The net cooling capacity of the model FDKNP308CEN-S with the air flow "High", the piping length of 15m, the outdoor
unit located 5m lower than the indoor unit, indoor wet-bulb temperature at 19.0 ˚C and outdoor dry-bulb temperature 35 ˚C
is
Net cooling capacity =
FDKN208C
0.03
5 10 15 20
1.0 0.995 0.995 0.99
1.0 0.995 0.99 0.985
1.0 0.99 0.98 0.97
5m
0.01
FDKNP208, 258 type
30m
20m(Outdoor unit is higher)
15m(Outdoor unit is lower)
×
7100 1.00
FDKNP308CEN-S Air flow
"High"
FDKN258C
0.03
25 30 35 40
_
0.985 0.985 0.98
_
0.98 0.975 0.97
0.96 0.95 0.94 0.93
10m 15m
0.02 0.03
FDKNP308 type
30m(Outdoor unit is higher)
15m(Outdoor unit is lower)
× ×
(0.98 - 0.01)
Length 15m.
Height difference 5 m
FDKN-C
FDKN308C
0.04
45 50 55
_ _ _
_ _ _
0.92 0.91 0.9
50m
6887 w
1.0 =
Factor by air
temperatures
521