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(Amount of refrigerant in a
single indoor unit system)
Amount of refrigerant with
which the system is charged
before leaving the factory
(Additional charging amount) =
Total amount of refrigerant(kg)
in the system
+
10-2. 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.
◆ 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.
NN
NN
oo
oo
tt
tt
ee
ee
Amount of refrigerant added
locally in accordance with the
length or diameter of the
refrigerant piping
(2) Calculate the smallest room volume(m
3
)
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
Outdoor unit
Indoor unit
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.)
Outdoor unit
Indoor unit
Opening between rooms
Partition
DVM E-D/B(chapter5)-E<03759 3/21/02 7:40 PM Page 41