Refrigerant Charge Quantity - Hitachi RAS-2-HVNP Service Manual

3. Piping work and refrigerant charge
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
Refrigerant charge before
Model
RAS-2HVNP
RAS-2.5HVNP
RAS-3HVNPE
RAS-4HVNPE
RAS-5HVNPE
RAS-6HVNPE
RAS-4HNPE
RAS-5HNPE
RAS-6HNPE
RAS-8HNPE
RAS-10HNPE
RAS-12HNP
IVX Standard series
Refrigerant charge before
Model
RAS-3HVNC
RAS-4HVNCE
RAS-5HVNCE
RAS-6HVNCE
RAS-4HNCE
RAS-5HNCE
RAS-6HNCE
RAS-8HNCE
RAS-10HNCE
RAS-12HNC
(1) For 2 indoor units system configuration, 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.
74
Additional refrigerant charge
shipment
(W (kg))
0
1.6
30 (for 2 indoor units system:
1.6
2.3
4.1
4.2
4.2
4.1
4.2
4.2
5.7
6.2
6.7
Additional refrigerant charge
shipment
(W (kg))
0
1.9
2.9
2.9
2.9
2.9
2.9
2.9
5.7
6.2
6.7
SMGB0079 rev.0 - 01/2013
Maximum additional
(P)
(g/m)
30
24)
40
60
60
60
60
60
60
(2)
(2)
(2)
Maximum additional
(P)
(g/m)
40
40
60
60
40
60
60
(2)
(2)
(2)
Chargeless
charge length
(kg) (m)
1.5 30 (1)
1.2 30 (1)
1.2 30
3.9 30
3.9 30
3.9 30
3.9 30
3.9 30
3.9 30
10.3 30
12.1 30
12.1 30
Chargeless
charge length
(kg) (m)
1.2 20
1.6 30
2.7 30
2.7 30
1.6 30
2.7 30
2.7 30
10.3 30
12.1 30
12.1 30