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V. Installation
10. Cautions for refrigerant leaks
V
40
10-1. Introduction
The DVM system, like most other air conditioning systems, uses R-22 as its refrigerant. R-22 itself is an
entirely safe non-toxic, non-combustible refrigerant but care must nevertheless 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.
* 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/m
3
(the weight in kg of CFC gas in 1m
3
of air) for ease of calculation.
Dangerous concentration of R-22: 0.3kg/m
3
Outdoor unit
Indoor unit
System No. 1
Direction of
refrigerant flow
Room where refrigerant leak has occurred
(Outflow of all the refrigerant in System No. 1)
DVM E-D/B(chapter5)-E<03759 3/21/02 7:40 PM Page 40