Panasonic CU-3KE19NBU Technical & Service Manual

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Contents

9. REFRIGERANT R410A:SPECIAL PRECAUTIONS WHEN SERVICING UNIT9-1. Characteristics of New Refrigerant R410A9-1-1. What is New Refrigerant R410A?R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Itsrefrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.9-1-2. Components (mixing proportions)HFC32 (50%) / HFC125 (50%)9-1-3. CharacteristicsLess toxic, more chemically stable refrigerantThe composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase. Thus, whenthere is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change incomposition of the remaining refrigerant. Therefore, do not add new refrigerant. Instead, recover theremaining refrigerant with the refrigerant recovery unit. Then, after evacuation, totally recharge the specifiedamount of refrigerant with the new refrigerant at its normal mixed composition state (in liquid phase).When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or liquidphase, and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is ingaseous state. Thus, always charge the refrigerant while it is in liquid phase.Ether-type oil is used for compressor oil for R410A-type units, which is differentfrom the mineral oil used for R22. Thus more attention to moisture prevention andfaster replacement work compared with conventional models are required.CAUTION88