Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 670

FDFL-H
Table of bypass factor
Model
FDFL 258 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
FDFL258 type
FDFL308 type
Note (1) Equivalent piping length can be obtained by calculating as follows.
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 and heating capacity
Example : The net cooling capacity of the model FDFL308HEN-SA 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 =
668
FDFL 308 type
0.030 0.036
0.013 0.018
5 10 15 20
1.0 1.0 1.0 1.0
1.0 0.995 0.99 0.985
1.0 0.99
0.98 0.97
FDFL258 type
30m
Outdoor unit is higher 20m
Outdoor unit is lower 15m
×
7100 1.00
FDFL308HEN-SA Air flow
"High"
25 30 35
1.0 0.995 0.995
0.98 0.975 0.97
0.96 0.95 0.94
5m 10m 15m
0.01 0.02 0.03
FDFL308 type
50m
Outdoor unit is higher 30m
Outdoor unit is lower 15m
× ×
(0.98 - 0.01) 1.0
Length 15m.
Height difference 5 m
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
= 6887 w
Factor by air
temperatures