Hitachi UTOPIA IVX STANDARD Series - Drain Piping

ENGLISH
8.6 REFRIGERANT CHARGING QUANTITY
Outdoor Units has been charged with refrigerant for 30m
of actual piping length. An additional refrigerant charged is
required in systems with actual piping length longer than 30m.
1 Determine an additional refrigerant quantity according to the
following procedure, and charge it into the system.
2 Record the additional refrigerant quantity to facilitate service
activities thereafter.
8.6.1 Refrigerant charge before shipment
(W
0
(kg))
W
0
is the outdoor unit refrigerant charge before shipment
explained before, and it’s shown in the following table:
IVX Standard series
Outdoor unit
Refrigerant charge
before shipment
(W
0
(kg))
Additional
refrigerant
charge
(g/m)
Maximum
additional
charge
(kg)
RAS-4HVNC1E 3.2 40 1.6
RAS-5HVNC1E 3.2 60 2.7
RAS-6HVNC1E 3.2 60 2.7
RAS-4HNC1E 3.2 40 1.6
RAS-5HNC1E 3.2 60 2.7
RAS-6HNC1E 3.2 60 2.7
! CAUTION
• Whenchargingrefrigerant,measuretheamountprecisely.
• Overloadingorunderloadingofrefrigerantmaycausecompressor
problems.
• Iftheactualpipinglengthislessthan5mconsultyourdealer.
Additional refrigerant charge calculation method
For all UTOPIA units RAS-(4-6)H(V)NC1E use the following
formula: W
1
= (L-30) x P
Pipe size (mm) Additional refrigerant charge factor (kg/m)
Ø15.88 x 0.19
Ø12.7 x 0.12
Ø9.52 x 0.065
Ø6.35 x 0.065
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 Pipe Length ≥ 30m
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 Applicable Model
DBS-26 All units

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 eld-supplied.
? NOTE
• Donotusethisdrainbosssetinacoldarea,becausethedrainwater
mayfreeze.
• This drain boss is not sufcient 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.
Rubber cap
Drain Boss
Extruded portion
Drain pipe
Drain pipe
Drain hole
of Base
DRAIN PIPING
PMML0395B rev.0 - 11/2015
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