Outdoor Unit

1. Caution For Refrigerant LeakThe installer and system specialist shall secure safety against leakage according to local regulations or standards.The following standards may be applicable if local regulations are not available.1.1 IntroductionThough the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should be large enough tosuch an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room.1.1.1 Limiting concentrationLimiting concentration is the limit of Freon gas concentration where immediate measures can be taken withouthurting human body when refrigerant leaks in the air. The limiting concentration shall be described in theunit of kg/m 3 (Freon gas weight per unit air volume) for facilitating calculation.Limiting concentration: 0.44kg/m 3 (R410A)Outdoor unit(No.1 system)Flow ofrefrigerantIndoor unitRoom where refrigerant leaks(Refrigerant of the whole No.1system flows out.)1.2 Checking procedure of limiting concentrationCheck limiting concentration along following steps and take appropriate measure depending on the situation.1.2.1 Calculate amount of all the replenished refrigerant (kg) per each refrigerantsystem.Amount of replenishedrefrigerant per one outdoorunit system+Amount of additionalreplenished refrigerant=Total amount of replenishedrefrigerant in refrigerantfacility (kg)Amount of replenishedrefrigerant at factory shipmentAmount of additionallyreplenished refrigerantdepending on pipinglength or pipingdiameter at customer1.2.2 Calculate minimum room capacityNote : In case one refrigerant facility isdivided into 2 or more refrigerantsystems and each system isindependent, amount of replenishedrefrigerant of each system shall beadopted.Calculate room capacity by regarding a portion as one room or the smaller room.(1) Without partition (2) With partition and with opening which serve aspassage of air to adjoining roomOutdoor unitOutdoor unitIndoor unitIndoor unitOpeningPartitionIn the case of openingwithout door , or 0.15% or more openings(to floor space) bothabove and below door)1Special Guide