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1-9. System Limitations
Table 10 : System Limitations
Outdoor unit horsepower
Number of max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
* In case that the total value of connected indoor units exceeds 1.200, increase the size of the
main tube (LM) by 1 rank for liquid tube. (Tables 2-2 and 10-2)
Table 10-2 : Liquid tube size-up condition of the main tube (LM) according to the number of indoor units
8 HP
Outdoor unit
horsepower
10 HP
* Heating capacity may rarely decrease.
Always check the gas density limit for
WARNING
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 fi xed for each type, so add it to the amount that
is charged in the fi eld. (For the refrigerant charge amount at
shipment, refer to the unit's nameplate.)
Minimum indoor volume & fl oor area as against the amount of
refrigerant is roughly as given in the following fi gure.
≤ 1.200
No need to rank up.
Need to increase by 1 rank.
No need to rank up.
Need to increase by 1 rank.
8 HP
10 HP
13*
13*
50-130%
Total value of indoor unit
1.200 <
≤ 1.469
2
3
m
m
85
229.5
80
216.0
75
202.5
70
189.0
65
175.5
60
162.0
55
148.5
50
135.0
45
121.5
40
108.0
35
94.5
30
81.0
25
67.5
20
54.0
15
40.5
10
27.0
5
13.5
0
0.0
CAUTION
13
1.469 <
Need to increase by 1 rank.*
Need to increase by 1 rank.
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)
0
10
20
30
40
50
Total amount of refrigerant
Pay special attention to any location, such
as a basement, etc., where leaking
refrigerant can accumulate, since
refrigerant gas is heavier than air.
60
70
80
90 100
kg
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