Sanyo ECO-i AHX0752 Technical Data Manual page 32

2. System Design
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:
2
fl oor area 166 ft × Ceiling height 8.8 ft = 1,410 ft
below, the minimum room volume for 1,222 oz of refrigerant is
3
4,070 ft (fl oor area 463 ft
required.
<Judgment by calculation>
Total refrigerant charge for the refrigeration equipment (oz)
Smallest room volume of all rooms where indoor units are
1,222 (oz)
=
1,410 (ft
In this case, an opening is required for ventilation.
1
WARNING
Checking of limit density
2
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.
3
(Total refrigerant charged amount: oz)
(Min. indoor volume where the indoor unit is installed: ft.
<
The limit density of refrigerant R410A which is used in this unit is
4
3
0.3 oz/ft. (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.)
5
6
7
8
3
. From the graph
2
). Therefore an opening for ventilation is
3
installed (ft )
3
= 0.86 (oz/ft ) > 0.3 (oz/ft
3
)
Always check the gas
density limit for the room in
which the unit is installed.
3
Limit density 0.3 (oz/ft. )
Design of W-3WAY ECO-i SYSTEM Unit Specifi cations
3
)
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
3
ft.
10000
9500
9000
8500
8000
7500
7000
6500
3
)
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
2-22
Range below
the density limit of
3
0.3 oz/ft.
(countermeasures
not needed)
Range above
the density limit of
0.3 oz/ft. 3
(countermeasures
needed)
0 500 1000 1500 2000 2500 3000
Total amount of refrigerant
2
ft.
1136
1079
1022
966
909
852
795
738
682
625
568
511
454
398
341
284
227
170
114
57
0
oz