English
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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 the smallest room volume (ft
3
)
In case like the following, calculate the volume of (A), (B) as a single
room or as the smallest room.
A.
Where there are no smaller room divisions
B.
Where there is a room division but there is an opening
between the rooms sufficiently large to permit a free flow of
air back and forth.
1.
opening between rooms
2.
partition
(Where there is an opening without a door or where there are open-
ings above and below the door which are each equivalent in size to
0.15% or more of the floor area.)
3.
Calculating the refrigerant density using the results of the calcula-
tions in steps 1 and 2 above.
If the result of the above calculation exceeds the maximum concen-
tration level then make similar calculations for the second then third
smallest room and so until the result falls short of the maximum con-
centration.
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 Daikin supplier.
amount of refriger-
ant in a single unit
system (amount of
refrigerant with
which the system
is charged before
leaving the factory)
+
additional charging
amount (amount of
refrigerant added
locally in accordance
with the length or
diameter of the refrig-
erant piping)
=
total amount
of refriger-
ant (lb.) in
the system
total volume of refrigerant in the
refrigerant system
≤
maximum concen-
tration level (lb./ft
3
)
size (ft
3
) of smallest room in which
there is an indoor unit installed
1
2
