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12 Maintenance notes
Check the insulation of the drain pump using a megohmmeter. Check that the insulation is above 1 MΩ when 500V are
applied.
Perform the neutralisation treatment after cleaning.
12.1.3 Collection of refrigerant to replace the indoor unit
¿
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
operation. 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.
394
SMGB0063 rev. 1 - 10/2010
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