Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
10 -
chapter 1 BS_01_G
1
Che
ck Bef
o
re
Se
rvicing
Repair
1) Portable equipment shall be repaired outside or in a workshop specially equipped for servicing units with slightly flammable
refrigerants.
2) Ensure sufficient ventilation at the repair place.
3) Be aware that malfunction of the equipment may be caused by refrigerant loss and a refrigerant leak is possible.
4) Discharge capacitors in a way that won't cause any spark.
5) When brazing is required, the following procedures shall be carried out in the right order:
1. Remove the refrigerant. If the recovery is not required by national regulations, drain the refrigerant to the outside. Take care
that the drained refrigerant will not cause any danger. In doubt, one person should guard the outlet. Take special care that
drained refrigerant will not float back into the building.
2. Evacuate the refrigerant circuit.
3. Purge the refrigerant circuit with nitrogen for 5 min.
4. Evacuate again.
5. Remove parts to be replaced by cutting, not by flame.
6. Purge the braze point with nitrogen during the brazing procedure.
7. Carry out a leak test before charging with refrigerant.
6) Reassemble sealed enclosures accurately. If seals are worn, replace them.
7) Check safety equipment before putting into operation.
Decommissioning
1) If the safety is affected when the equipment is putted out of service, the charged refrigerant shall be removed before decom-
missioning.
2) Ensure sufficient ventilation at the equipment location.
3) Be aware that malfunction of the equipment may be caused by refrigerant loss and a refrigerant leak is possible.
4) Discharge capacitors in a way that won't cause any spark.
5) Remove the refrigerant. If the recovery is not required by national regulations, drain the refrigerant to the outside. Take care
that the drained refrigerant will not cause any danger. In doubt, one person should guard the outlet. Take special care that
drained refrigerant will not float back into the building.
6) Evacuate the refrigerant circuit.
7) Purge the refrigerant circuit with nitrogen for 5 min.
8) Evacuate again.
9) Fill with nitrogen up to atmospheric pressure.
10) Put a label on the equipment that the refrigerant is removed.
Disposal
1) Ensure sufficient ventilation at the working place.
2) Remove the refrigerant. If the recovery is not required by national regulations, drain the refrigerant to the outside. Take care
that the drained refrigerant will not cause any danger. In doubt, one person should guard the outlet. Take special care that
drained refrigerant will not float back into the building.
3) Evacuate the refrigerant circuit.
4) Purge the refrigerant circuit with nitrogen for 5 min.
5) Evacuate again.
6) Cut out the compressor and drain the oil.
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