Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 708

V MULTI
Table of bypass factor
FDT series
Model
Item
Hi
Air flow
Lo
FDR series
Model
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.
(1)
Equivalent piping length m
Heating
FDC508 type
FDC808, 1008 type
Note (1) Equivalent piping length can be obtained by calculating as follows.
508 series [φ19.05 (3/4")] : Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
808 series [φ25.4 (1")]
1008 series [φ28.58 (1 1/8")] : Equivalent piping length = Real piping length + (0.20 × 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 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 FDC808HES3 with the air flow "High", the piping length of 40m, 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 =
706
208 type 258 type
0.112 0.050
0.073 0.030
208 type 258 type
0.035 0.035
0.021 0.020
5 10 15
1.0 1.0 1.0
1.0 0.99 0.975
1.0 0.99 0.98
: Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
Model
×
20000 1.00
FDC808HES3
Air flow
"High"
308 type
0.065
0.030
308 type
0.039
0.023
20 25 30 35
1.0 1.0 0.995 0.995
0.965 0.95 0.94 0.925
0.97 0.96 0.95 0.94
5m 10m 15m
0.01 0.02 0.03
All models
50m
Outdoor unit is higher 30m
Outdoor unit is lower 15m
× ×
(0.93 - 0.01)
Length m.
Height difference 5 m
408 type 508 type
0.076 0.025
0.050 0.013
408 type 508 type
0.085 0.035
0.060 0.023
40 45 50
0.99 0.99 0.985
0.915 0.9 0.89
0.93 0.92 0.91
20m 25m 30m
0.04 0.05
1.0 = 18400 w
Factor by air
temperatures
55
0.985
0.875
0.9
0.06