Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 395 / 1106

393
FDT(N)-C
Equivalent piping length (1) m 5 10 15 20 25 30 35 40 45 50 55
FDTNP, FDT208 type 1.0 0.995
   
FDTNP, FDT258 type 1.0 0.995 0.99 0.985 0.98 0.975 0.97
   
1.0 0.99
0.98 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.9
1.0
0.995 0.985 0.98 0.97 0.965 0.955 0.95 0.94 0.935 0.925
1.0
0.99 0.975 0.965 0.95 0.94 0.925 0.915 0.9 0.89 0.875
1.0 0.99
   
1.0
   
1.0
   
Modei
Item
Max.one way piping length
Max.vertical height difference
FDT208, 258
FDTNP208, 258 type
30m
15m
50m
20m(Outdoor unit is higher)
15m(Outdoor unit is lower)
30m(Outdoor unit is higher)
15m(Outdoor unit is lower)
FDTNP308~508 type FDT308~508 type
(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.
Note (1) Equivalent piping length can be obtained by calculating as follows.
208, 258, 308 series [
φ
15.88(5/8
″
)]: Equivalent piping length = Real piping (0.10
×
Number or bends in piping)
408, 508, series [
φ
19.05(3/4
″
)]: Equivalent piping length = Real piping (0.15
×
Number of bends in piping)
[Equivalent piping length < Limitation length of 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.
Piping length limitations
How to obtain the cooling capacity
Example : The net cooling capacity of the model FDT308CEN-A 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 = 7100
×
1.00
×
(0.98 - 0.01)
×
1.0 = 6887 w
Factor by air
temperatures
FDT308CEN-A
Air flow
“High”
Length 15m.
Height difference 5 m
Note (1) Values in the table indicate the one way piping length between the indoor and outdoor units.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
5m 10m 15m
Adjustment coefficient 0.01 0.02 0.03
50/60Hz
0.995 0.99 0.985 0.985 0.98
Cooling
FDTNP308 type
FDTNP408 type
FDTNP508 type
FDT308 type
FDT408 type
FDT508 type
0.98 0.97 0.96 0.95 0.94
/0.975 /0.965 /0.95 /0.94 /0.925
0.995 0.985 0.98 0.97 0.965 0.955
/0.99 /0.98 /0.97 /0.96 /0.95 /0.94
0.99 0.975 0.965 0.95 0.94 0.925
/0.985 /0.97 /0.955 /0.94 /0.925 /0.91