Check Of Density Limit - Sanyo SPW-X483GH56 Installation Instruction

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 R-22 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 density should rise
excessively. Suffocation from leakage of R-22 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 with
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
>
Density limit (kg/m
The density limit of R-22 which is used in multi air
conditioners is 0.15 kg/m
1 : If there are 2 or more refrigerating
NOTE
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 Room C Room D Room E Room F
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.
Important
3
3
)
3
.
Outdoor unit
e.g.,
charged amount (15 kg)
Indoor unit
0803_M_I
2 : The standards for minimum room
NOTE
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 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
Small
room
Mechanical ventilation device - Gas leak detector
NOTE
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
Range below the
35
2
m
density limit
of 0.15 kg/m
30
(countermeasures
not needed)
25
20
15
10
5
0
5
Total amount of refrigerant
0001_M_I
Outdoor unit
Refrigerant tubing
Indoor unit
0002_M_I
Refrigerant tubing
Outdoor unit
Indoor unit
Medium Large room
room
3
Range above
the density limit
of 0.15 kg/m 3
(countermeasures
needed)
10 15
0813_M_I
0003_M_I
kg