Fujitsu AOU48RLXFZ Design & Technical Manual page 27

Fig 2
y
(X , Y )
1 1
Capacity ratio of indoor units to outdoor unit, X (%)
Indoor unit Outdoor
70°F DB
connecting
temperature
60°F WB
capacity (%) (°F)
TC
23 53.2
32 53.2
41 53.2
50 53.2
59 53.2
120 68 53.2
77 50.8
X
2
86 47.8
95 45.0
104 41.6
115 36.8
●●● ●●●
●●●
●●● ●●●
23 45.0
32 45.0
41 45.0
50 45.0
59 45.0
100 68 44.0
77 43.0
X
1
86 41.6
95 39.9
104 38.2
115 35.5
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kBtu/h)
Y= (53.2-48.0) / (120-100) (117-100) + 48.0 = 52.4 (kBtu/h)
B-4 : Capacity change rate by indoor units connecting capacity
Y / Y = 52.4 / 48.0 = 1.092
1
(X , Y
2
2
(X, Y)
Indoor temperature
75°F DB 80°F DB
63°F WB 67°F WB
PI TC PI TC
2.50 56.3 2.55 59.7
2.56 56.3 2.75 59.7
2.61 56.3 2.85 59.7
2.70 56.3 2.95 59.7
2.90 56.3 3.20 59.7
3.55 56.3 3.60 59.7
4.20 54.6 4.40 58.0
4.76 51.5 5.13 55.3
5.24 48.1 5.79 53.2
5.20 44.0 5.90 47.1
Y
2
4.94 39.9 5.06 41.3
●●● ●●● ●●● ●●●
●●● ●●● ●●● ●●●
2.00 49.5 2.11 53.2
2.08 49.5 2.14 53.2
2.12 49.5 2.19 53.2
2.16 49.5 2.25 53.2
2.21 49.5 2.40 53.2
2.45 49.1 2.63 52.9
2.80 48.5 3.20 52.2
3.81 47.4 4.15 51.9
4.67 46.1 4.95 48.0
5.01 42.7 5.12 44.4
Y
1
4.75 37.5 4.97 39.2
- (02 - 08) -
i) Refer to 4. CAPACITY TABLE to find Y
and Y using X and X
2 1 2
ii) Calculate capacity of outdoor unit using
following equation:
)
Y=(Y -Y ) / (X -X ) (X-X1) + Y
2 1 2 1
x
85°F DB 90°F DB
71°F WB 73°F WB
PI TC PI TC
2.65 64.8 2.75 68.6
2.80 64.8 2.90 68.6
2.90 64.8 3.05 68.6
3.05 64.8 3.05 68.6
3.30 64.8 3.35 68.6
4.00 64.8 4.05 68.6
4.70 63.5 4.80 65.2
5.33 61.4 5.45 63.1
5.90 55.3 5.93 57.0
5.96 49.1 5.98 53.6
5.15 44.0 5.20 45.4
●●● ●●● ●●● ●●●
●●● ●●● ●●● ●●●
2.25 59.7 2.40 64.8
2.30 59.7 2.45 64.8
2.40 59.7 2.50 64.8
2.50 59.7 2.60 64.8
2.75 59.7 2.80 64.8
3.00 59.4 3.10 64.8
3.50 58.7 3.90 62.8
4.41 58.0 4.70 60.4
5.19 53.2 5.26 54.6
5.21 48.5 5.32 51.2
5.05 42.7 5.10 44.0
X1 = 100 % X = 117 %
Y1 = 48.0 Y
2. MODEL SELECTION
1
.
1
PI
2.80
2.95
3.10
3.20
3.40
4.10
4.85
5.51
5.96
5.98
5.28
●●●
●●●
2.50
2.55
2.65
2.80
3.00
3.20
4.00
5.00
5.34
5.41
5.15
X2 = 120 %
Y2 = 53.2