Collection Of Refrigerant To Replace The Indoor Unit - Hitachi RCI-1.0FSN3 Service Manual

12 Maintenance notes
KPI-(502-1002)H3E
Aluminium heat exchanger can be cleaned using vapour. Clean
the exchager using stream.

12.1.4 Collection of refrigerant to replace the indoor unit

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Collection of refrigerant after replacing the indoor unit
1 Connect the gauge manifold to the gas and liquid stop valve.
2 Switch the power supply ON.
3 Enable pin 1 of DSW1 on the outdoor unit PCB for cooling ope-
ration. Close the liquid stop valve and collect the refrigerant.
4 Carry out the following procedures immediately when the side
pressure drops and the gas stop valve indicates –0.01 MPa.
N O T E
Prevent the pressure from dropping below –0.01 MPa. If the
pressure is less, the compressor may be faulty.
a. Close the gas stop valve.
b. Disable pin 1 of DSW1.
5 Switch off the power supply.
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SMGB0077 rev.0 - 01/2013