SiE33-102 Caution for Refrigerant Leaks
Installation Manual 167
9. Caution for Refrigerant Leaks
9.1 Caution for Refrigerant Leaks
9.1.1 Introduction
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.
The VRV System, like other air conditioning systems, uses R-22 as its refrigerant. R-22 itself is an entirely
safe non-toxic, non-combustible refrigerant. Nevertheless care must be taken to ensure that the air
conditioning facilities are installed in a room which is sufficiently large to avoid a dangerous concentration
of refrigerant gas in the unlikely event of a serious leak in the system. The KHK (High Pressure Gas
Protection Association, in Japan) has established its own standard in respect of refrigerant gas
concentrations for inclusion with the general standards covering refrigeration and air conditioning facilities.
9.1.2 Maximum Concentration Level
Dangerous concentration
Dangerous concentration means the maximum concentration of CFC gas which can be dealt quickly and
with without damage to the person in the case of a leak of refrigerant into the air. The unit of measurement
of the dangerous concentration is kg/m³ (the weight in kg of CFC gas in 1m³ of air) for ease of calculation.
Dangerous concentration of R-22 : 0.3kg/m³
(KHK facility standard : S0010)
Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant
is heavier than air.
direction of the refrigerant flow
room where refrigerant leak
has occurred (outflow of all the
refrigerant from the system)
(V1871)
Si33-102.book Page 167 Tuesday, June 26, 2001 3:18 PM
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