The maximun charge in a room shall be in accordance with the following:
m
max
= 2,5 x (LFL)
(5/4)
x h
0
x (A)
1/2
or the required minumum floor area A
min
to install an appliance with refri-
gerant charge M(kg) shall be in accordance with following:
A
min
= (M/(2,5 x (LFL)
(5/4)
x h
0
))
2
Where:
m
max
is the allowable maximum charge in a room, in kg;
M is the refrigerant charge amount in appliance, in kg;
A
min
is the required minimum room area, in m
2
;
A is the room area, in m
2
;
LFL is the lower flammable limit, in kg/m
3
;
0
h is the release height, the vertical distance in metres from the floor to the point
of release when the appliance is installed;
h = (hinst+hrel) or 0,6 m whichever is higher
hrel is the release offset in metres from the bottom of the appliance to the point
of release
hinst is the installed height in metres of the unit
Reference installed heights are given below:
0.0 m for portable and floor mounted;
1.0m for window mounted;
1.8m for wall mounted;
2.2m for ceiling mounted;
If the minimum installed height given by the manufacturer is higher than the
reference installed height, then in addition A
min
and m
max
for the reference
installed height have to be given by the manufacturer. An appliance may have
multiple reference installed heights. In this case, A
min
and m
max
calculations shall
be provided for all applicable reference installed heights.
For appliances serving one or more rooms with an air duct system, the lowest
opening of the duct connection to each conditioned space or any opening of the
indoor unit greater than 5 cm
2
, at the lowest position to the space, shall be used
for h0. However, h0 shall not be less than 0,6 m. A
min
shall be calculated as a
function of the opening heights of the duct to the spaces and the refrigerant
charge for the spaces where leaked refrigerant may flow to, considering where
the unit is located. All spaces shall have a floor area more than A
min
.
0
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