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

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[1-1 Preparation for Piping Work ]
BS_01_G
chapter 1 -
1
1
Che
ck Bef
o
re
Se
rvicing
1 Check Before Servicing
1-1 Preparation for Piping Work
1-1-1 Read before Servicing
1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type
Multi air conditioner for building application CITY MULTI:R32
2. Check the symptoms exhibited by the unit to be serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3. Thoroughly read the safety precautions at the beginning of this manual.
4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of re-
frigerant.
For information about the correct use of tools, refer to the following page(s). [1-1-2 Tool Preparation]
5. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved
or replaced.

Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free
of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.

These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.
6. Toxic hydrofluoric acid gas will form or refrigerant will ignite if leaked refrigerant is exposed to
an open flame. Be sure to keep the work area well ventilated.
CAUTION

Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.

The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.
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