Read Before Servicing; Items To Be Checked - Mitsubishi Electric PUHY-P200 Service Handbook

¡ ¡ Read Before Servicing

[1] Items to Be Checked

1. Verify the type of refrigerant used by the unit to be serviced.
Refrigerant Type : R410A
2. Check the symptom exhibited by the unit to be serviced.
Look in this service handbook for symptoms relating to the refrigerant cycle.
3. Be sure to carefully read the Safety Precautions at the beginning of this document.
4. Prepare necessary tools: Prepare tools exclusive for use with each refrigerant type.
Refer to P7 for more information.
5. If the refrigerant circuit is opened (to repair a gas leak etc.), the dryer needs to be replaced.
Only use the dryer designed specifically for Citi Multi YGM-A. The use of other dryers may result in malfunctions.
✻ Replace the dryer after completing all the repairs on the refrigerant circuit.
(If left exposed to air, the dryer will absorb moisture. Replace the dryer as quickly as possible after removing
the old one.)
✻ When all of the following conditions are met, the replacement of drier is not necessary.
(1) Do not leave the refrigerant circuit longer than 2 hours.
(2) Cover the opening end with a cap or tape to keep moisture from entering.
(3) Also cover the opening end of the new part with a cap or tape
(4) Do not perform the task in the rain.
(5) Evacuate the refrigerant circuit as specified.
6. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be
moved or replaced.
• Use pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and
free of contaminants such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture.
• Contaminants inside the refrigerant piping will cause the refrigerant oil to deteriorate.
7. If there is a gas leak or if the remaining refrigerant is exposed to an open flame, a noxious gas
hydrofluoric acid may form. Keep workplace well ventilated.
CAUTION
1. Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
2. Chloride in some types of refrigerants such as R22 will cause the refrigerating machine oil to
deteriorate.
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