Hitachi RAS-4-HNCE - General Notes

3. Piping work and refrigerant charge
74
SMGB0079 rev.0 - 01/2013
3.4.2 Refrigerant charge quantity
Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length.
1 The additional refrigerant quantity should be determined and charged into the system according to the following pro-
cedure.
2 Record the additional refrigerant quantity in order to facilitate maintenance and servicing activities.

Refrigerant charge before shipment (W0 (kg))
W0 is the outdoor unit refrigerant charge before shipment explained 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)
Chargeless
length
(m)
RAS-2HVNP 1.6 30 1.5 30 (1)
RAS-2.5HVNP 1.6
30 (for 2 indoor units system:
24)
1.2 30 (1)
RAS-3HVNPE 2.3 40 1.2 30
RAS-4HVNPE 4.1 60 3.9 30
RAS-5HVNPE 4.2 60 3.9 30
RAS-6HVNPE 4.2 60 3.9 30
RAS-4HNPE 4.1 60 3.9 30
RAS-5HNPE 4.2 60 3.9 30
RAS-6HNPE 4.2 60 3.9 30
RAS-8HNPE 5.7 (2) 10.3 30
RAS-10HNPE 6.2 (2) 12.1 30
RAS-12HNP 6.7 (2) 12.1 30
IVX Standard series
Model
Refrigerant charge before
shipment
(W
0
(kg))
Additional refrigerant charge
(P)
(g/m)
Maximum additional
charge
(kg)
Chargeless
length
(m)
RAS-3HVNC 1.9 40 1.2 20
RAS-4HVNCE 2.9 40 1.6 30
RAS-5HVNCE 2.9 60 2.7 30
RAS-6HVNCE 2.9 60 2.7 30
RAS-4HNCE 2.9 40 1.6 30
RAS-5HNCE 2.9 60 2.7 30
RAS-6HNCE 2.9 60 2.7 30
RAS-8HNCE 5.7 (2) 10.3 30
RAS-10HNCE 6.2 (2) 12.1 30
RAS-12HNC 6.7 (2) 12.1 30
(1) For 2 indoor units system conguration, the chargeless length is considered to be 0 m.
(2) Calculated multiplying a constant factor.
C A U T I O N
• 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.