Check Of Density Limit - Sanyo W-3WAY ECO-i 85464369098000 Installation Instructions Manual

Check of Density Limit

The room in which the air conditioner is to be
installed requires a design that in the event of refrig-
erant gas leaking out, its density will not exceed a set
limit.
The refrigerant (R410A), which is used in the air condition-
er, 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-exis-
tent. 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 effec-
tive use of floor space, individual control, energy conserva-
tion 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 pro-
cedure 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 (lbs)
Min. volume of the indoor unit installed room (ft.
< Density limit (oz/ft.
The density limit of refrigerant which is used in multi air condi-
3
tioners is 0.3 oz/ft. (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:
e.g., charged
amount (353 oz)
Indoor unit
Room A Room B Room C Room D Room E Room F
The possible amount of leaked refrigerant gas in rooms A, B
and C is 353 oz.
The possible amount of leaked refrigerant gas in rooms D, E
and F is 529 oz.
W-3WAY_ECO-i_US.indd 3 W-3WAY_ECO-i_US.indd 3
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 (open-
ing 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 small-
est 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 small-
est room becomes the object.
3
)
3
)
3. The minimum indoor floor space compared with the
amount of refrigerant is roughly as follows: (When the
ceiling is 8.8 ft. high)
Outdoor unit
e.g., charged
amount (529 oz)
3
Outdoor unit
Refrigerant tubing
Refrigerant tubing
Very
small
room
Small Medium Large room
room room
Mechanical ventilation device – Gas leak detector
3
ft.
4000
Range below
3500
the density limit of
3000 3
0.3 oz/ft.
(countermeasures
2500
not needed)
2000
1500
Range above
the density limit of
1000
3
0.3 oz/ft.
500
(countermeasures
needed)
0
0 200 400 600 800 1000 1200
Total amount of refrigerant
Indoor unit
Outdoor unit
Indoor unit
2
ft.
454
398
341
284
227
170
114
57
0
oz
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