Sanyo AHX0952 - Manual (Page 16)

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
80 ft 2 × ceiling height 8.8 ft. = room volume 704 ft. 3 ), the
graph at right shows that the minimum room volume
should be 497 ft. 3 (floor area 56 ft. 2 ) for refrigerant of 147
oz. Accordingly, openings such as louvers are required for
this room.
<Determination by calculation>
Overall refrigerant charge amount for the air conditioner: oz
(Minimum room volume for indoor unit: ft. 3 )
=
147 (oz) + 123 (oz)
= 0.38 (oz/ft. 3 ) > 0.3 (oz/ft. 3 )
704 (ft. 3 )
Therefore, openings such as louvers are required for this
room.
● Obtain charge amount for each tubing size
Note that the charge amounts per 3.3 ft. are different for each liquid tubing size.
ш3/8" (ш9.52) → LA + LB + LC + LD : 212 ft. × 0.602 oz/ft. = 127 oz
ш1/4" (ш6.35) → 1 + 2 + 3 + 4 + 5 : 75 ft. × 0.279 oz/ft. = 20 oz
Total 147 oz
Additional refrigerant charge amount is 147 oz.
Be sure to check the limit
density for the room in which
the indoor unit is installed.
CAUTION
● Example of each tubing length
Main tubing Distribution joint tubing
LA = 131 ft. Indoor side
LB = 16 ft. 1 = 16 ft. 4 = 20 ft.
LC = 16 ft. 2 = 16 ft. 5 = 16 ft.
LD = 49 ft. 3 = 7 ft.
LN
L1
L2
LC LB
LA
Main tube of unit
1st branch
model 0752 model 0952 model 1252 model 1852
model 1852
Unit distribution tube
1 2 3 n–1
n
Example:
0 0
57
114
170
227
284
341
398
454
0
500
1000
1500
2000
2500
3000
3500
4000
400 200 600 800 1000 1200
Total amount of refrigerant
Mi
n
. i
n
door v
o
lu
me
Mi
n
. i
n
door floor area
(whe
n
the ceili
ng
i
s
8
.8
ft.
hi
g
h)
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)
16
07-056 Mini_ECOi_II_NA 3/19/07 2:40 PM Page 16