5.7 Caution of the Pressure by Check Joint
When the pressure is measured, use the check joint of gas stop valve ((A) in the figure below) 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.
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"
NOTE:
Be careful that refrigerant and oil do not splash to the electrical parts when removing the charge hoses.
Exclusive for Vacuum Pump and Refrigerant Charge
Fig 5.4 Check Joint Position
