13
WARNING
Always check the gas density limit for
the room in which the unit is installed.
1-10. Check of Limit Density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
If the density could exceed the limit level, it is necessary to
provide an opening between the unit and the adjacent room, or
to install mechanical ventilation which is interlocked with a leak
detector.
(Total refrigerant charged amount:
kg
)
(Min. indoor volume where the indoor unit is installed: m³)
≤ Limit density 0.44 (
kg
/m³)
The limit density of refrigerant R410A which is used in this unit
is 0.44
kg
/m³ (ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant fixed for each type, so add it to the amount that
is charged in the field. (For the refrigerant charge amount at
shipment, refer to the unit’s nameplate.)
Minimum indoor volume & floor area as against the amount of
refrigerant is roughly as given in the following figure.
1-9. System Limitations
Table 10 : System Limitations
Outdoor unit
horsepower
4 HP
5 HP
6 HP
Number of max. connectable indoor units
7
8
9
Max. allowable indoor/outdoor capacity ratio
50-130%
20
10
0
30 40
60 70 80 90 100
50
m
2
m
3
40.5
54.0
27.0
13.5
0.0
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
15
10
5
0
20
25
30
35
40
45
50
55
60
65
70
75
80
229.5
85
kg
Total amount of refrigerant
Range below the
density limit of
0.44
kg
/m³
(Countermeasures
not needed)
Range above the
density limit of
0.44
kg
/m³
(Countermeasures
needed)
Min. indoor volume
Min. indoor floor area (when the ceiling is 2.7 m high)
CAUTION
Pay special attention to any location, such
as a basement, etc., where leaking
refrigerant can accumulate, since
refrigerant gas is heavier than air.
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