Hitachi RAS-5FSNY2E [54/148] Hp 2 hp 2 hp 5 hp

Hitachi RAS-6FSVN2E [54/148] Hp 2 hp 2 hp 5 hp
4 Capacities and
selection data
46
TCGB0068 rev.1 - 08/2012
between indoor and outdoor units (+H).
Step 1: Initial pre-selection
Taking into account the SET-FREE system possibilities mentioned above, it has been adjusted the indoor unit capacities
by dip-switch (DSW3).
Item Room 1 Room 2 Room 3 1+2+3 Outdoor unit
Selected model
RPIM-1.5
(Adjusted to
1.3)
RCD-2.0
RCI-2.5
(Adjusted to
2.3)
5.6 HP
RAS-5FSVN2E
(112%)
Nominal
cooling capacity
kW
3.8 5.6 6.7 16.1 13.02
Nominal
heating capacity
4.2 6.3 7.5 18.0 14.30
The pre-selected capacity of the different indoor units has not been the inmediately higher in order to apply a safety factor
considering the different correction factors existing, which will reduce the capacity.
To determinate the nominal cooling and heating capacity, it’s necessary refer to sections “Cooling and Heating capacity
tables according to total power of combined indoor units” respectively, taking into account the temperature condition and
the total power of combined indoor units (112%).
N O T E
In this case, the total power of combined indoor units is not shown in the capacity tables (112%), then an in-
terpolation should be carried out using the values above and below (120% and 110%) those of the total power
of combined indoor units.
If the air inlet temperature for the indoor unit or outdoor unit is not contained in the capacity tables, an interpo-
lation should be carried out using the values above and below those of the air inlet temperature.
Then, it’s shown a diagram of the installation resulting:
East zone
(3.3HP)
Indoor unit capacity (Equivalent HP)
West zone
(2.3HP)
5HP
1.3HP 2.0HP 2.3HP = 5.6HP
For this example it has been assumed three differents indoor units (RPK-1.5FSN2E, RCD-2.0FSN2 and RCI-2.5FSN3E)
in order to show how the choice of indoor unit can affect the different factors presented in this chapter.
The resulting total indoor unit horsepower is 5.6 HP. The outdoor unit with the horsepower inmediatelly higher is the 6 HP
model, but the possibility “Reduced total outdoor unit capacity” allows the 5 HP model selection. Thus, it’s allowed at the
outdoor unit to be up to 12% smaller capacity when compared with other air conditioning systems.
The total combination horsepower is the following:
Total combination horsepower =
Total indoor unit horsepower
x 100 =
5.6 HP
x 100 = 112 %
Outdoor unit horsepower 5.0 HP
Next step will be the capacity correction using the different correction factors shown in this chapter.
This procedure is divided in two parts: cooling and heating.

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