Hitachi RAS-4-HNCE - Caution of the Pressure by Check Joint

3. Piping work and refrigerant charge
73
SMGB0079 rev.0 - 01/2013
3
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)HVNP
RAS-3HVNC
RAS-3HVNPE
RAS-(4-6)H(V)NCE
RAS-(4-6)H(V)NPE
RAS-(8-10)HN(P/C)E
RAS-12HN(P/C)
C
A
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.