Technical Information

Piping work and
refrigerant charge
TCGB0079 rev.0 - 01/2013
121
9.4 Refrigerant charge amount
Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length.
• The additional refrigerant quantity should be determined and charged into the system according to the following pro-
cedure.
• Record the additional refrigerant quantity in order to facilitate maintenance and servicing activities.
9.4.1 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)
RAS-2HVNP
1.6 30 1.5
RAS-2.5HVNP
1.6 30 (for 2 indoor units system: 24) 1.2
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
RAS-12HNP
6.7 (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-3HVNC
1.9 40 1.2
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
RAS-12HNC
6.7 (1) 12.1
(1) need to be calculated
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.
9.4.2 Calculation method for the additional refrigerant charge
Calculate the additional refrigerant charge amount according to the following steps:

Step 1: Additional refrigerant charge calculation for liquid piping (W
1
(kg))
Outdoor units has been charged with refrigerant for 30 m (20 m for RAS-3HVNC) of actual piping length, an additional
refrigerant charged is required in systems with actual piping length longer.
9
TCGB0079_rev0_11-2012.indb 121 29/01/2013 14:27:31