Sanyo SPW-CR1503GDYH8 Technical Data & Service Manual page 40

2. Example of System Design
After extending indoor and outdoor unit
LE2
Main tube
LF
I4
Distribtuon
I5
branch
I6
Additional refrigerant charge amount for extension = 2,150 g
Total refrigerant charge amount including initial charge amount
= 20,000 g (190 type) + 8,000 g (70 type) + 17,690g + 2,150 g = 47,640 g
7 Checking of limit density
Density limit is determined on the basis of the size of a room
using an indoor unit of minimum capacity.
For, instance, when an indoor unit (3) is used in a room
2
(Floor area 15 m
40.5 m 3 ), the graph on the right shows that the minimum
room volume should be 159 m
refrigerant of 47.64 kg, and accordingly openings like louvers
are required for the room.
<Determination by calculation>
Overall refrigerant charge amount for
(
(Minimum room volume for an indoor unit : m
47.64 (kg)
= = 1.18 (kg/m
3
40.5 (m )
Therefore, openings like louvers are required for the room.
Total cooling capacity after distribution joint
/ Outdoor unit type / Indoor unit type
10.6 + 7.3 + 7.3 = 25.2 kW
7.3 + 7.3 = 14.6 kW
36 type
25 type
25 type
× Ceiling height 2.7 m = Room volume
3
3
(Floor area 59 m
the air-conditioner : kg
>
3 ) 0.3 (kg/m 3 )
Wide tube Narrow tube
28.58 (1 1/8) 12.70 (1/2)
19.05 (3/4) 9.52 (3/8)
19.05 (3/4) 9.52 (3/8)
15.88 (5/8) 9.52 (3/8)
15.88 (5/8) 9.52 (3/8)
2
m
100
95
90
85
80
2
) for
75
70
65
60
55
50
45
)
40
35
3
)
30
25
20
15
II - 18
Design of W-ECO MULTI SYSTEM
1 Tubing 2 Additional
length (m) refrigerant (g/m) (g)
4
5
4
6
7
3
m
270.0
256.5
243.0
Range below the
229.5
density limit of
216.0
3
0.3 kg/m
202.5
(Countermeasures
189.0
not needed)
175.5
162.0
148.5
Range above the
135.0
density limit of
121.5
0.3 kg/m
108.0
(Countermeasures
94.5
needed)
81.0
67.5
54.0
40.5
20 30 40 50
Total amount of refrigerant
1× × × × × 2
125 500
75 375
75 300
75 450
75 525
3
60 70 80 kg
1669_M_I
TD831077