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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 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 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 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).
1. In a room where the concentration may exceed the limit, create an opening with adjacent rooms, or install mechanical ventilation
combined with a gas leak detection device. The concentration is calculated as detailed below.
Total amount of refrigerant (kg)
3
Min. volume of the indoor unit installed room (m
)
3
≤ Concentration limit (kg/m
)
3
The concentration limit of R410A which is used in multi air conditioners is 0.3 kg/m
.
▼ 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.
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)
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