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Warnings on Refrigerant Leakage
Check of Concentration 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 concentration will not exceed a set limit.
Refrigerant R32
The refrigerant R32 which is used in the air conditioner is mildly fl ammable. In Europe and areas where IEC
standards apply, EN/IEC 60335-2-40 is the applicable standard. The refrigerant R32 does not have the toxicity of
ammonia, and is not restricted by laws to be imposed which protect the ozone layer. If this appliance is connected
with the outdoor unit containing R32 refrigerant, refer to the Installation and Owner's Manual attached to the
outdoor unit.
Refrigerant R410A
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 to be imposed which protect the ozone layer. However, since it contains more than
air, it poses the risk of suffocation if its concentration should rise excessively. Suffocation from leakage of R410A
is almost non-existent. With the recent increase in the number of high concentration buildings, however, the
installation of multi air conditioner systems is on the increase because of the need for effective use of space,
individual control, energy conservation by curtailing heat and carrying power etc.
Most importantly, the multi air conditioner system is able to hold a large amount of refrigerant compared with
conventional individual air conditioners. If a single unit of the multi 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 concentration
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 concentration may exceed the limit imposed by the local regulation, create an opening with
adjacent rooms, or install mechanical ventilation or isolation, combined with a gas leak detection device, which
complies with the local regulatory requirements.
The concentration calculation method is as given below. Please note the concentration limit between R32 and
R410A refrigerant differs.
Total amount of refrigerant (kg)
Min. volume of the indoor unit installed room (m
Refrigerant Concentration Limit shall be in accordance with local regulations.
▼ NOTE 1
If there are 2 or more refrigerating systems in a single refrigerating device, the amounts of refrigerant should be as
charged in each independent device.
e.g., charged amount (10 kg)
Room A
Room B
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.
▼ NOTE 2
The standards for minimum room volume are as follows.
1) No partition (shaded portion)
49-EN
≤ Concentration limit (kg/m
)
3
)
3
Outdoor unit
e.g., charged amount (15 kg)
Indoor unit
Room C
Room D
Room E
Room F
– 25 –
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 fl oor spaces at the top or bottom of the door).
3) If an indoor unit is installed in each partitioned room and the refrigerant piping is interconnected, the smallest
room of course becomes the object. But when a 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.
Very small room
Mechanical ventilation device - Gas leak detector
▼ NOTE 3
System compliance has been completed to IEC60335-2-40 Ed6. If EN378 compliance is required please refer
separately to EN378 for guidance.
Important
Outdoor unit
Refrigerant piping
Indoor unit
Refrigerant piping
Outdoor unit
Indoor unit
Small
Medium
Large room
room
room
50-EN
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