Hitachi RAS-10HNCE, Installation And Operation Manual

Page: 33 / 372

PMML0251A rev.2 - 02/2013
Refrigerant piping & refrigerant charge
33
ENGLISH
When the refrigerant should be collected into the outdoor unit due
to indoor/outdoor unit relocation, collect the refrigerant as follows:
1 Attach the manifold gauge to the gas stop valve and the liquid
stop valve
2 Turn ON the power source
3 Set the DSW1-1 pin of the outdoor unit PCB at the “ON” side
for cooling operation. Close the liquid stop valve and collect
the refrigerant.
4 When the pressure at lower pressure side (gas stop valve)
indicates -0.01 MPa (-100 mmHg), perform the following pro-
cedures immediately.
- Close the gas stop valve.
- Set the DSW1-1 pin at the “OFF” side (To stop the unit
operation).
5 Turn OFF the power source.
C A U T I O N
Measure the low pressure by the pressure gauge and keep it not
to decrease than -0.01 MPa. If the pressure is lower than -0.01
MPa, the compressor may be faulty.
13.7 REFRIGERANT PUMP DOWN
13.6.1 Refrigerant charge before shipment (W0 (kg))
W0 is the outdoor unit refrigerant charge before shipment ex-
plained before, and it’s shown in the following table:
IVX Premium series
Model
Refrigerant charge
before shipment
(W
0
(kg))
Additional
refrigerant
charge (P)
(g/m)
Maximum
additional
charge
(kg)
RAS-3HVNPE 2.3 40 1.2
RAS-4HVNPE 4.1 60 3.9
RAS-5HVNPE 4.2 60 3.9
RAS-6HVNPE 4.2 60 3.9
RAS-4HNPE 4.1 60 3.9
RAS-5HNPE 4.2 60 3.9
RAS-6HNPE 4.2 60 3.9
RAS-8HNPE 5.7 (1) 10.3
RAS-10HNPE 6.2 (1) 12.1
IVX Standard series
Outdoor unit
Refrigerant charge
before shipment
(W
0
(kg))
Additional
refrigerant
charge
(g/m)
Maximum
additional
charge
(kg)
RAS-4HVNCE 2.9 40 1.6
RAS-5HVNCE 2.9 60 2.7
RAS-6HVNCE 2.9 60 2.7
RAS-4HNCE 2.9 40 1.6
RAS-5HNCE 2.9 60 2.7
RAS-6HNCE 2.9 60 2.7
RAS-8HNCE 5.7 (1) 10.3
RAS-10HNCE 6.2 (1) 12.1
(1) need to be calculate
C A U T I O N
• When charging refrigerant, measure the amount precisely.
• Overloading or underloading of refrigerant may cause com-
pressor problems.
• If the actual piping length is less than 5 m consult your dealer.
Additional refrigerant charge calculation method
For all UTOPIA units except RAS-(3-6)H(V)N(P/C)E
Use the
following formula:
:
W
1
= (L-30) x P
For UTOPIA units RAS-(8-10)HN(P/C)E
The additional refrigerant charge for RAS-(8-10)HN(P/C)E 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)
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
_PMML0251A_r2.indb 33 06/02/2013 9:05:09