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CAUTION
1. This unit requires no additional refrigerant charge up to
tubing length 30 m. In case of more than 30 m, additional
refrigerant charge is required. Refer to Tables 1-5 and 1-7.
2. In case of multi type installation, indoor units should be
installed within the same room. If multi type indoor units
are installed in different rooms, temperature control may
develop problems because thermostat operation must
follow the thermostat condition of 1 indoor unit only (the
main unit).
WARNING
Always check the gas density for the room in which the unit
is installed.
■ Check of limit density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally escapes, its
density does not exceed the limit level.
If the density might exceed the limit level, it is necessary to
set up an opening between it and the adjacent room, or to
install mechanical ventilation which is interlocked with the leak
detector.
(Total refrigerant charged amount: kg)
(Min. indoor volume where indoor unit is installed: m
< Limit density 0.3 (kg/m
The limit density of refrigerant which is used in this unit is
0.3 kg/m
3
(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 at the field. (Refer to the unit's nameplate for the
amount of charged refrigerant at shipment.)
Minimum indoor volume & floor area relative to the amount
of refrigerant are roughly as given in the following table.
2
3
m
m
50
135
Range below the
45
121.5
density limit of
0.3 kg/m
(Countermeasures
40
108
not needed)
35
94.5
30
81.0
25
67.5
20
54.0
15
40.5
10
27.0
5
13.5
10
CAUTION
Pay special attention to any location, such as a basement
or recessed area, etc. where leaked refrigerant can collect,
since refrigerant gas is heavier than air.
Big_PAC_eng.indb 11
Big_PAC_eng.indb 11
3
)
3
)
3
Range above
the density limit
of 0.3 kg/m
3
(Countermeasures
needed)
Kg
20
30
40
Total amount of refrigerant
1-6. Optional Distribution Joint Kits
● NRF-DL16R: Cooling capacity after distribution is 16.0 kW
(54,600 BTU/h) or less.
● NRF-D1668R: Cooling capacity after distribution is more
than 16.0 kW (54,600 BTU/h) and less than 68.0 kW
(232,000 BTU/h).
● NRF-DL28R: Cooling capacity after distribution is 28.0 kW
(95,500 BTU/h) or less.
Table 1-9 Distribution Branch Size ( 1, 2, 3, 4)
Indoor Unit
Gas tube
Liquid tube
Indoor Unit
25 type
Gas tube
Liquid tube
NRF-DL16R (for Double Twin)
Distribution
joint
Insulation
for gas tube
Table 1-10 Size of connection point on each part
(shown is inside diameter of tubing)
Size
Part A
Part B
mm
ø19.05
ø15.88
NRF-D1668R (for Twin & Double Twin)
175
135
A
B C D
D C B
A
A
Distribution joint
B
C
D
Reducing
E
joint
Insulation
F
for gas tube
Table 1-11 Size of connection point on each part
(Shown is inside diameters of tubing)
Size
Part A
mm
ø28.58
Size
Part E
mm
ø15.88
11
Unit: mm (in.)
18 type
12.7 (1/2)
6.35 (1/4)
36 type
48 type
15.88 (5/8)
9.52 (3/8)
Distribution
joint
Insulation
for liquid tube
Unit: mm
Part C
Part D
Part E
ø12.7
ø9.52
ø6.35
110
97
E F
E
F GH
E
G
F
E
Distribution joint
F
G
H
Reducing
Insulation
joint
for liquid tube
Unit: mm
Part B
Part C
Part D
ø25.4
ø22.22
ø19.05
Part F
Part G
Part H
ø12.7
ø9.52
ø6.35
2009/08/26 16:33:08
2009/08/26 16:33:08
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