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11-2. Procedure for checking dangerous
Concentration
Check the dangerous concentration in accordance with steps 1~4 below and take whatever action is necessary.
(1) Calculate the amount of refrigerant(kg) charged to each system separately.
(Amount of refrigerant in a
single indoor unit system)
Amount of refrigerant with
which the system is charged
before leaving the factory
N N
N N
o o
o o
t t
t t
e e
e e
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems then
use the amounts of refrigerant with which each separate system is charged.
(2) Calculate the smallest room volume(m
In a case like the following calculate the volume of (1), (2) as a single room or as the smallest room.
1) Where there are no smaller room divisions
2) 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. (Where there is an opening without a door or where
there are openings above and below the door which are each equivalent in size to 0.15% or
more of the floor area.)
Indoor unit
Opening between rooms
+
(Additional charging amount) =
Amount of refrigerant added
locally in accordance with the
length or diameter of the
refrigerant piping
3
)
Outdoor unit
Indoor unit
Outdoor unit
Partition
55
Total amount of refrigerant(kg)
in the system
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