Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 793 / 1106

FDC-HKX
791
Capacity Correction Calculations (The procedure for both cooling and heating is the same.)
Corrction when
cooling?
Performance correction of indoor unit = System performance
×
[Example] FDTJ90HKXE2
23.8
×
= 7.65kW
Indoor unit capacity
Total capacity of indoor units
operating simultaneously
Performance correction of indoor unit
Performance of indoor unit
FDTJ90HKXE2 ................... 7.65kW (Actual performance)
FDTJ140HKXE2 ................
11.9kW (Actual performance)
FDTWJ28HKXE2B .......... 2.38kW (Actual performance)
FDTSJ22HKXE2B ..........
1.87kW (Actual performance)
Outdoor unit performance correction
Example Conditions
• Unit (50 Hz)
Outdoor unit FDCJ280HKXE2B 1 unit
Indoor unit
FDTJ90HKXE2 - 1 unit
FDTJ140HKXE2 - 1 unit
FDTWJ28HKXE2B - 1 unit
FDTSJ22HKXE2B - 1 unit
• Piping length
(Shall be common among units)
..........
60 meters (suitable length)
• Difference in height between indoor and ........... 15 meters
outdoor units (Outdoor unit is lower)
• Air conditions .......... Outdoor air temperature 33˚CDB
Indoor temperature 26˚CDB 19 ˚CWB
90
280
1 Total connection capacity from indoor unit ... 90
×
1 unit + 140
×
1 unit + 28
×
1 unitt + 22
×
1 unit = 280
= 28kW (From table above)
2 Performance correction from indoor and outdoor temperatures
28
×
1.02 = 28.5kW
3
Performance correction from piping length and difference in height between indoor and outdoor units
28.5 (0.865 - 0.03) =
23.8kW
(Actual performance)
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