Sanyo CHDZ09053 - Manual (Page 32)

2-22
Design of W-3WAY ECO-i SYSTEM Unit Specifi cations
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Checking of limit density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
If the density could exceed the limit level, it is necessary to provide
an opening between the unit and the adjacent room, or to install
mechanical ventilation which is interlocked with a leak detector.
(Total refrigerant charged amount: oz)
(Min. indoor volume where the indoor unit is installed: ft.
3
)
< Limit density 0.3 (oz/ft.
3
)
The limit density of refrigerant R410A which is used in this unit is
0.3 oz/ft.
3
(ISO 5149).
The shipped outdoor unit comes charged with the amount of refriger-
ant fixed for each type, so add it to the amount that is charged in the
field. (For the refrigerant charge amount at shipment, refer to the
unit’s nameplate.)
Checking of limit density
The limit density judgment is made based on the room with the
indoor unit having the smallest capacity in the system after exten-
sion.
The volume of the room where a type 1852 indoor unit is used
(connected to tubing L9) is calculated as follows:
fl oor area 166 ft
2 × Ceiling height 8.8 ft = 1,410 ft 3 . From the graph
below, the minimum room volume for 1,222 oz of refrigerant is
4,070 ft
3 (fl oor area 463 ft 2 ). Therefore an opening for ventilation is
required.
<Judgment by calculation>
Total refrigerant charge for the refrigeration equipment (oz)
Smallest room volume of all rooms where indoor units are
installed (ft 3 )
=
1,222 (oz)
= 0.86 (oz/ft 3 ) > 0.3 (oz/ft 3 )
1,410 (ft 3 )
In this case, an opening is required for ventilation.
Always check the gas
density limit for the room in
which the unit is installed.
WARNING
2. System Design
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
0 0
57
114
170
227
284
341
398
454
511
568
625
682
738
795
852
909
966
1022
1079
1136
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
1000 500 1500 2000 2500 3000
Total amount of refrigerant
Min.
indoor v
olume
Min.
indoor floor area
(when the ceiling is 8.8 ft.
high)
ft. 3 ft. 2
oz
Range above
the density limit of
0.3 oz/ft.
3
(countermeasures
needed)
Range below
the density limit of
0.3 oz/ft.
3
(countermeasures
not needed)