General Considerations; Ras-(2-3)Hvrc3 Refrigerant Pump Down Example - Hitachi UTOPIA R32 Series Installation And Operation Manual

11.1 General considerations

When the refrigerant should be collected into the outdoor unit due to indoor/outdoor unit
relocation, collect the refrigerant as follows:
• Attach the manifold gauge to the gas stop valve and the liquid stop valve.
• Turn ON the power source.
• On outdoor unit PCB set the DSW301- pin1 ON for cooling operation.
• Close the Liquid stop valve on the unit and collect the refrigerant.
• When the pressure at lower pressure side (gas stop valve) indicates -0.01 MPa (-100 mmHg),
perform the following procedures immediately.
✓ Close the "gas stop valve" or the "High/ Low gas stop valve" depending on the unit series.
✓ Set the DSW turned ON before at the OFF side (To stop the unit operation).
• Turn OFF the power source.
!
CAUTION
• Measure the low pressure by the pressure gauge and keep it not to decrease than -0.01 MPa.
• If the pressure is lower than -0.01 MPa, the compressor may be faulty.

11.2 RAS-(2-3)HVRC3 refrigerant pump down example

PMEN0654 rev.0 - 12/2023
DIP switch (DSW301 pin-1 ON)
Liquid
stop
valve
Manifold gauge
Gas stop valve
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