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 table.
CAUTION
Pay special attention to any location, such as a basement, etc., where leaking refrigerant can accumulate,
since refrigerant gas is heavier than air.
Table 9 Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size (mm)
6.35
9.52
12.7 15.88 19.05 22.22
25.4
Amount of additional
refrigerant charge/m (
g
/m)
26
56
128
185
259
366
490
Table 10 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
U-8ME2R8(E) U-10ME2R8(E) U-12ME2R8(E) U-14ME2R8(E) U-16ME2R8(E) U-18ME2R8(E) U-20ME2R8(E)
─
─
4.0
kg
4.0
kg
4.0
kg
5.5
kg
5.5
kg
Table 11 Refrigerant Charge Amount at Shipment (for Outdoor Unit)
U-8ME2R8(E) U-10ME2R8(E) U-12ME2R8(E) U-14ME2R8(E) U-16ME2R8(E) U-18ME2R8(E) U-20ME2R8(E)
11.1
kg
11.1
kg
11.3
kg
11.3
kg
11.3
kg
11.0
kg
11.0
kg
1-9. System Limitations
Table 12 System Limitations
Max. No. allowable connected outdoor units
4 *
2
Max. capacity allowable connected outdoor units 224 kW (80 HP)
Max. connectable indoor units
64 *
1
Max. allowable indoor/outdoor capacity ratio
50 – 130 %*
3
Maximum number of connectable indoor units when connected with minimum capacity
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
Total horse
power
Number of
indoor units
8 HP
13
14 HP
23
20 HP
33
26 HP
43
32 HP
53
38 HP
63
10 HP
16
16 HP
26
22 HP
36
28 HP
46
34 HP
56
40~80 HP
64
12 HP
19
18 HP
29
24 HP
40
30 HP
50
36 HP
59
*1: In the case of 38 HP or smaller units, the number is limited
by the total capacity of the connected indoor units.
*2: Up to 4 units can be connected if the system has been
extended.
*3: If the following conditions are satisfied, the effective range is
above 130 % and below 200 %.
i ) Obey the limited number of connectable indoor units.
ii ) The lower limit of operating range for heating outdoor
temperature is limited to -10°CWB (standard -25°CWB).
iii) Simultaneous operation is limited to less than 130 % of
connectable indoor units.
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)
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