Sanyo SPW-CR365GX56, Technical Data Manual

Page: 28 / 345

2
2 - 20
Design of Mini ECO-i SYSTEM
2. System Design
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 is used in a room (floor
area 7.43 m 2
×
ceiling height 2.7 m = room volume
20.06 m 3 ), the graph at right shows that the minimum
room volume should be 14.1 m 3 (floor area 5.2 m 2 ) for
refrigerant of 4.238 kg. Accordingly, openings such as
louvers are required for this room.
<Determination by calculation>
Overall refrigerant charge amount for the air conditioner: kg
(Minimum room volume for indoor unit: m
3
)
=
4.238 (kg) + 3.5 (kg)
= 0.39 (kg/m 3 )
≥
0.3 (kg/m 3 )
20.06 (m
3
)
Therefore, openings such as louvers are required for
this room.
G
Obtain charge amount for each tubing size
Note that the charge amounts per 1 meter are different for each liquid tubing size.
ø9.52
→
LA + LB + LC + LD : 65 m
×
0.056 kg/m = 3.64 kg
ø6.35
→
1
+
2
+
3
+
4
+
5
: 23 m
×
0.026 kg/m = 0.598 kg
Total 4.238 kg
Additional refrigerant charge amount is 4.238 kg.
Be sure to check the limit density
for the room in which the indoor
unit is installed.
CAUTION
G
Example of each tubing length
Main tubing Distribution joint tubing
LA = 40 m Indoor side
LB = 5 m
1
= 5 m
4
= 6 m
LC = 5 m
2
= 5 m
5
= 5 m
LD = 15 m
3
= 2 m
LN
L1
L2
LC LB
LA
Mai n t u be of un it
1 s t bra n ch
model 74 model 94 model 124 model 164
model 1 8 4
U n it di s trib u tio n t u be
1 2 3 n –1
n
Example:
40
3 5
3 0
25
20
15
10
5
0
10 8 .0
94.5
8 1.0
67.5
54.0
40.5
27.0
1 3 .5
0
10 20 3 0
Total amo un t of refri g era n t
Mi
n
. i
n
door floor area
(whe
n
the ceili
ng
i
s
2.7 m hi
g
h)
m 2
k g
Ra ng e below the
de ns ity limit
of 0. 3 k g /m
3
(co un termea su re s
n ot n eeded)
Ra ng e above
the de ns ity limit
of 0. 3 k g /m 3
(co un termea su re s
n eeded)
m 3
06-405 Mini-ECOi_TD2 11/6/06 5:14 PM Page 20