Caution Of The Pressure By Check Joint - Hitachi RAS-2-HVNP Service Manual

3. Piping work and refrigerant charge
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 figure 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
Check joint for gas stop valve -A-
Check joint for piping -B-
Check joint for liquid stop valve -C-
N O T E
Be careful that refrigerant and oil do not splash to the electrical parts at removing the charge hoses.
73
RAS-(4-6)H(V)NCE
C
A
SMGB0079 rev.0 - 01/2013
RAS-3HVNPE
Cooling operation
Low pressure
High pressure
Exclusive for vacuum pump and refrigerant charge
RAS-(4-6)H(V)NPE
RAS-(8-10)HN(P/C)E
RAS-12HN(P/C)
B
C
A
Heating operation
High pressure
Low pressure
3