Sanyo SPW-C0705DXHN8 - Page 31

2-21
Design of W-2WAY ECO-i SYSTEM Unit Specifications
1
2
3
4
5
6
7
8
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 96 indoor unit is used (con-
nected to tubing L11) is calculated as follows:
floor area 15 m
2
× Ceiling height 2.7 m = 40. 5 m
3
. From the graph
below, the minimum room volume for 51.45 kg of refrigerant is
168 m
3
(floor area 62 m
2
). Therefore an opening for ventilation is
required.
<Judgment by calculation>
Total refrigerant charge for the refrigeration equipment (kg)
Smallest room volume of all rooms where indoor units are
installed (m
3
)
=
51.45 (kg)
= 1.27 (kg/m
3
) > 0.30 (kg/m
3
)
40.5 (m
3
)
In this case, an opening is required for ventilation.
Check 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
the leak detector.
(Total refrigerant charged amount: kg)
(Min. indoor volume where the indoor unit is installed: m
3
)
< Limit density 0.3 (kg/m
3
)
The limit density of refrigerant which is used in this unit is 0.3
kg/m
3
(ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant 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.)
Always check the gas
density limit for the room in
which the unit is installed.
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
WARNING
CAUTION
40.5
54.0
20 30 40 50 60 70 80 kg
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
229.5
243.0
256.5
270.0
m
2
m
3
Total amount of refrigerant
Min. indoor floor area (when the ceiling is 2.7 m high)
Min. indoor volume
Range below the
density limit of
0.3 kg/m
3
(Countermeasures
not needed)
Range above the
density limit of
0.3 kg/m
3
(Countermeasures
needed)
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
2. System Design
Pay special attention to any location,
such as a basement, etc., where
leaking refrigerant can accumulate,
since refrigerant gas is heavier than
air.