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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.
The refrigerant R32, 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 R32 is
almost non-existent. However with recent increse in the number of high concentration buildings, 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 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 mode 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.
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.
101-EN
Total amount of refrigerant (kg)
3
)
3
≤ Concentration limit (kg/m
)
Outdoor unit
e.g., charged amount (15 kg)
Indoor unit
Room C
Room D
Room E
Room F
– 51 –
NOTE 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
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.
Important
Outdoor unit
Refrigerant piping
Refrigerant piping
Very small room
Medium
Small
Large room
room
room
Mechanical ventilation device - Gas leak detector
Indoor unit
Outdoor unit
Indoor unit
102-EN
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