Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 429

Table of bypass factor
Model
FDEN (P) 208 type
Item
Hi
Air flow
Lo
(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.
Equivalent piping length (1) m
Heating
FDEN208 type
FDENP 208 type
FDEN258 type
FDENP258 type
FDENP308 type
FDENP408 type
FDENP508 type
Note (1) Equivalent piping length can be obtained by calculating as follows.
208, 258, 308 series [ø15.88(5/8")]: Equivalent piping length = Real piping length + (0.10 × Number or bends in piping)
408, 508, series [ø19.05(3/4")]: Equivalent piping length = Real piping length + (0.15 × Number of 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 heigh sifference
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 capacity
Example:
The net cooling capacity of the model FDENP308HEN-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
FDEN (P) 258 type
0.031
0.016
5 10 15
1.0 1.0 1.0
0.995
1.0 0.995
1.0 0.995 0.99
0.98
1.0 0.99
0.995 0.985
1.0
0.99 0.975
1.0
FDEN208, 258 type
Model
FDENP208, 258 type
30m
20m (Outdoor unit is higher )
15m (Outdoor unit is lower )
×
= 7100
FDENP308HEN-S
FDENP308 type
0.030 0.036
0.013 0.018
20 25 30 35
1.0 1.0 0.995 0.995
0.99 0.985 0.985 0.98
0.985 0.98 0.975 0.97
0.97 0.96 0.95 0.94
0.98 0.97 0.965 0.955
0.965 0.95 0.94 0.925
5m 10m 15m
0.01 0.02 0.03
FDENP308, 408, 508 type
50m
30m (Outdoor unit is higher )
15m (Outdoor unit is lower)
×
1.00 (0.98 - 0.01)
Air flow Length 15m.
"High" Height difference 5 m
FDEN-H
FDENP408,508 type
0.018
0.010
40 45 50
0.99 0.99 0.985
  
  
0.93 0.92 0.91
0.95 0.94 0.935
0.915 0.9 0.89
20m 25m 30m
0.04 0.05 0.06
×
1.0 = 6887 w
Factor by air
temperatures
55
0.985


0.9
0.925
0.875
427