Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 491

Table of bypass factor
Model
Item
Air flow Hi
(2) Correction of cooling and heating capacity in relation to air flow rate control (fan speed)
Coefficient: 1.00 at High, 0.95 at Low
(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)
Equivalent piping length m
Heating
FDKN (P) 208 type
FDKN (P) 258 type
FDKNP 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 and when the
outdoor unit is located at a higher height than the indoor unit in heating 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 FDKNP308HEN-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
FDKN (P) 208 type
0.03
5 10 15 20
1.0 1.0 1.0 1.0
1.0 0.995
0.995 0.99
1.0 0.995 0.99 0.985
1.0 0.99 0.98 0.97
FDKN(P) 208, 258 type
30m
20m (Outdoor unit is higher)
15m (Outdoor unit is lower)
×
= 7100 1.00
FDKNP308HEN-S Air flow
"High"
FDKN (P) 258 type
0.03
25 30 35
1.0 0.995 0.995
0.985 0.985 0.98
0.98 0.975 0.97
0.96 0.95 0.94
5m 10m 15m
0.01 0.02 0.03
FDKNP308 type
50m
30m (Outdoor unit is higher)
15m (Outdoor unit is lower)
× ×
(0.98 - 0.01)
Length 15m.
Height difference 5 m
FDKN-H
FDKNP308 type
0.04
40 45 50 55
0.99 0.99 0.985 0.985
   
   
0.93 0.92 0.91 0.9
20m 25m 30m
0.04 0.05 0.06
1.0 = 6887 w
Factor by air
temperatures
489