Hitachi UTOPIA IVX Serie Manuel D'utilisation page 29

DRAIN PIPING
Additional refrigerant charge calculation method
!
C A U T I O N
• When charging refrigerant, measure the amount precisely.
• Overloading or underloading of refrigerant may cause compressor
failure.
• If the actual piping length is less than 5 m consult your dealer.
1 For UTOPIA units RAS-(8-10)HNCE
The additional refrigerant charge for RAS-(8-10)HNCE units
must be calculated by multiplying the total piping length of
each diameter per its calculation factor according to the
following table. The result is the additional refrigerant charge
subtracting 1.6 for 8 HP or 2.0 for 10 HP. (Fill the table with
the values).
Pipe size (mm)
Ø15.88
Ø12.7
Ø9.52
Ø6.35
?
N O T E
When the outdoor unit is combined with RPI-(8/10)HP indoor units, an
additional refrigerant charge is necessary (W2)= 1kg/unit.
9 DRAIN PIPING
9.1 DRAIN DISCHARGING BOSS
When the base of the outdoor unit is temporarily utilized as a
drain receiver and the drain water in it is discharged, this drain
boss is utilized to connect the drain piping.
Model
DBS-26

Connecting procedure
1 Insert the rubber cap into the drain boss up to the extruded
portions.
2 Insert the boss into the unit base and turn approximately
40 degree counterclockwise.
3 Size of the drain boss is 32 mm (O.D.).
4 A drain pipe should be field-supplied.
?
N O T E
Do not use this drain boss set in a cold area, because the drain water
may freeze.
13 PMML0393B rev.3 - 05/2019
Additional refrigerant charge
factor (kg/m)
x 0.19
x 0.12
x 0.065
x 0.065
Applicable Model
All units
2 For RAS-(4-10)XH(V)NP1E units check the technical
information of DX-Interface series 2.
Setting of Pipe Length DSW
DSW2 setting will be required only when the refrigerant pipe
length is shorter than 5 m or longer than 30 m. Pipe length
setting shall be performed as shown below.
(The  side in the table below shows the DSW location)
DSW2 on Outdoor PCB1
Factory setting Pipe Length ≤ 5m
This drain boss is not sufficient to collect all the drain water. If collecting
drain water is completely required, provide a drain-pan that is bigger than
the unit base and install it under the unit with drainage.
Drain pipe
Drain pipe
Extruded portion
Drain boss
Pipe Length ≥ 30m
Drain hole
of base
Rubber cap