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English 17
12. CAUTION FOR REFRIGERANT LEAKS
(Points to note in connection with refrigerant leaks)
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 SPLIT System, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-combustible
refrigerant. Nevertheless care must be taken to ensure that air condi-
tioning facilities are installed in a room which is sufficiently large. This
assures that the maximum concentration level of refrigerant gas is not
exceeded, in the unlikely event of major leak in the system and this in
accordance to the local applicable regulations and standards.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maximum
concentration of refrigerant is directly related to the humanly occupied
space in to which it could leak.
The unit of measurement of the concentration is lb./ft
3
(the weight in lb.
of the refrigerant gas in 1ft
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1 to 4
below and take whatever action is necessary to comply.
1. Calculate the amount of refrigerant (lb.) charged to each system
separately.
NOTE
• Where a single refrigerant facility is divided into 2 entirely indepen-
dent refrigerant systems then use the amount of refrigerant with
which each separate system is charged.
2. Calculate a room volume (ft
3
)
3. Calculating the refrigerant concentration by using the results of the
calculations in steps 1 and 2 above.
4. Dealing with the situations where the result exceeds the maximum
concentration level.
Where the installation of a facility results in a concentration in excess
of the maximum concentration level then it will be necessary to
revise the system.
Please consult your dealer.
amount of refriger-
ant in the unit
(amount of refrig-
erant with which
the system is
charged before
leaving the factory)
+
additional charging
amount (amount of
refrigerant added
locally in accordance
with the length of the
refrigerant piping and
type of indoor unit)
=
total amount
of refriger-
ant (lb.) in
the system
total amount of refrigerant in the
refrigerant system
maximum concen-
tration level (lb./ft
3
)
volume (ft
3
) of the room in which
there is an indoor unit installed
Direction of the refrigerant flow
Room where
refrigerant leak has
occurred (outflow of
all the refrigerant
from the system)
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