iv
2. The standards for minimum room volume are as follows.
(1) No partition (shaded portion)
(2) When there is an effective opening with the adjacent room
for ventilation of leaking refrigerant gas (opening without
a door, or an opening 0.15% or larger than the respective
floor spaces at the top or bottom of the door).
(3) If an indoor unit is installed in each partitioned room and
the refrigerant tubing is interconnected, the smallest room
of course becomes the object. But when mechanical
ventilation is installed interlocked with a gas leakage
detector in the smallest room where the density limit is
exceeded, the volume of the next smallest room becomes
the object.
3. The minimum indoor floor space compared with the
amount of refrigerant is roughly as follows: (When the
ceiling is 2.7 m high)
40.5
54.0
27.0
13.5
0.0
20100 30 40 60 70 80 90 10050
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
229.5
243.0
256.0
270.0
m
2
m
3
15
10
5
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
283.5
297.0
310.5
324.0
337.5
kg
Check of Density Limit
The room in which the air conditioner is to be installed
requires a design that in the event of refrigerant gas
leaking out, its density will not exceed a set limit.
The refrigerant (R410A), which is used in the air conditioner,
is safe, without the toxicity or combustibility of ammonia, and
is not restricted by laws imposed to protect the ozone layer.
However, since it contains more than air, it poses the risk of
suffocation if its density should rise excessively. Suffocation
from leakage of refrigerant is almost non-existent. With the
recent increase in the number of high density buildings,
however, the installation of multi air conditioner systems is
on the increase because of the need for effective use of floor
space, individual control, energy conservation by curtailing heat
and carrying power, etc.
Most importantly, the multi air conditioner system is able
to replenish a large amount of refrigerant compared to
conventional individual air conditioners. If a single unit of the
multi air conditioner system is to be installed in a small room,
select a suitable model and installation procedure so that if the
refrigerant accidentally leaks out, its density does not reach the
limit (and in the event of an emergency, measures can be made
before injury can occur).
In a room where the density may exceed the limit, create an
opening with adjacent rooms, or install mechanical ventilation
combined with a gas leak detection device. The density is as
given below.
Total amount of refrigerant (kg)
Min. volume of the indoor unit installed room (m
3
)
< Density limit (kg/m
3
)
The density limit of refrigerant which is used in multi air
conditioners is 0.3 kg/m
3
(ISO 5149).
NOTE
1. If there are 2 or more refrigerating systems in a single
refrigerating device, the amount of refrigerant should be as
charged in each independent device.
For the amount of charge in this example:
The possible amount of leaked refrigerant gas in rooms A,
B and C is 10 kg.
The possible amount of leaked refrigerant gas in rooms D,
E and F is 15 kg.
e.g., charged
amount (10 kg)
Indoor unit
Outdoor unit
e.g., charged
amount (15 kg)
Room A Room B Room C Room D Room E Room F
Outdoor unit
Refrigerant tubing
Indoor unit
Mechanical ventilation device – Gas leak detector
Refrigerant tubing
Outdoor unit
Indoor unit
Very
small
room
Small
room
Medium
room
Large room
Total amount of refrigerant
Range below the
density limit of
0.3 kg/m³
(Countermeasures
not needed)
Range above the
density limit of
0.3 kg/m³
(Countermeasures
needed)
Min. indoor volume
Min. indoor floor area
(when the ceiling is 2.7 m high)
2WAYEng.indb5 2014/03/1115:03:16
ii
CAUTION
•Do not touch the air inlet or the
sharp aluminum fins of the
outdoor unit. You may get
injured.
• Ventilate any enclosed areas
when installing or testing the
refrigeration system. Escaped
refrigerant gas, on contact with
fire or heat, can produce
dangerously toxic gas.
• Confirm after installation that no
refrigerant gas is leaking. If the
gas comes in contact with a
burning stove, gas water heater,
electric room heater or other heat
source, it can cause the
generation of poisonous gas.
Others
CAUTION
•
•
•
Do not touch the air inlet or
the sharp aluminum fins of
the outdoor unit. You may
get injured.
Do not sit or step on the unit,
you may fall down accidentally.
Do not stick any object into
the FAN CASE.
You may be injured and the
unit may be damaged.
When Servicing
•
•
•
Turn the power OFF at the main
power box (mains), wait at least
10 minutes until it is discharged,
then open the unit to check or repair
electrical parts and wiring.
Keep your fingers and clothing away
from any moving parts.
Clean up the site after you finish,
remembering to check that no metal
scraps or bits of wiring have been left
inside the unit being serviced.
WARNING
•
•
Do not clean inside the indoor and
outdoor units by users. Engage
authorized dealer or specialist for
cleaning.
• This product must not be modified
or disassembled under any
circumstances. Modified or
disassembled unit may cause fire,
electric shock or injury.
In case of malfunction of this
appliance, do not repair by
yourself. Contact to the sales
dealer or service dealer for a
repair.
SM830204-05_2WAY SYS_new.indb 5 15/01/05 11:56:44
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