Hitachi RAS-(4-12)HNP(1)(E) - Caution of the Pressure by Check Joint; Refrigerant Charge Quantity; Refrigerant Charge before Shipment

3 Piping work and
refrigerant charge
84
SMGB0087 rev.0 - 12/2013
3.4.1 Caution of the pressure by check joint
When the pressure is measured, use the check joint of gas stop valve (A), and use the check joint of liquid piping (B) in
the gure below.
At that time, connect the pressure gauge according to the following table because of high pressure side and low pressure
side changes by operation mode.
RAS-(2-2.5)HVNP1
RAS-3HVNC1
RAS-3HVNP1E
RAS-(4-6)H(V)NC1E
RAS-(4-6)H(V)NP1E
RAS-(8-10)HN(P/C)E
RAS-12HN(P/C)
C
A
B
A
C
C
B
A
Coolingoperation Heatingoperation
Check joint for gas stop valve -A- Low pressure High pressure
Check joint for piping -B- High pressure Low pressure
Check joint for liquid stop valve -C- Exclusive for vacuum pump and refrigerant charge
 N O T E
Be careful that refrigerant and oil do not splash to the electrical parts at removing the charge hoses.
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 (W
0
(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-2HVNP1 1.6 30 1.5 30 (1)
RAS-2.5HVNP1 1.6 30 (for 2 indoor units system: 24) 1.2 30 (1)
RAS-3HVNP1E 2.3 40 1.2 30
RAS-4HVNP1E 4.1 60 3.9 30
RAS-5HVNP1E 4.2 60 3.9 30
RAS-6HVNP1E 4.2 60 3.9 30
RAS-4HNP1E 4.1 60 3.9 30
RAS-5HNP1E 4.2 60 3.9 30
RAS-6HNP1E 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