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MULTI V Water IV
1. Cautions for Refrigerant Leaks
The 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 Introduction
Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should
be large to such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant
gas leaks in the room.
1.1.1 Concentration limit
Concentration limit is the limit of Freon gas concentration where immediate measures can be taken without
hurting human body when refrigerant leaks in the air. The concentration limit shall be described in the unit of
kg/m3 (Freon gas weight per unit air volume) for facilitating calculation.
Outside unit
1.2 Checking procedure of limiting concentration
Check 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
refrigerant system.
Amount of pre-charged
refrigerant per single
system
Amount of replenished
refrigerant at factory shipment
2
Heat Pump
Concentration limit : 0.44kg/m3(R410A)
Flow of
(No.1 system)
refrigerant
Indoor unit
Amount of additional
replenished refrigerant
Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter by customer
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
Total amount of refrigerant
in the system
(kg)
Note : In case one refrigerant facility is
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
Special Guide
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