Fujitsu AOU48RLXFZ Design & Technical Manual page 31

Fig 4
y
(X , Y )
1 1
Capacity ratio of indoor units to outdoor unit, X (%)
Outdoor
Indoor unit
temperature
connecting
60°F DB
DB WB
capacity (%)
TC
°F °F
5 3 38.9
14 12 49.5
23 19 53.2
32 28 57.3
41 37 60.7
120
47 43 63.8
X 50 47 66.2
2
59 50 68.6
68 59 69.6
75 65 70.3
●●● ●●● ●●●
●●●
●●● ●●● ●●●
5 3 35.8
14 12 43.7
23 19 49.1
32 28 53.6
41 37 58.0
100
47 43 63.1
X 50 47 63.5
1
59 50 64.1
68 59 64.8
75 65 65.2
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kBtu/h)
Y= (62.1-54.0) / (120-100) (120-100) + 54.0 = 62.1 (kBtu/h)
B-4 : Capacity change rate by indoor units connecting capacity
Y / Y =
62.1 / 54.0 = 1.15
1
(X , Y
2
2
(X, Y)
Indoor temperature
65°F DB 70°F DB
PI TC PI TC
5.57 37.5 5.58 36.2
5.62 48.8 5.64 47.8
5.71 52.5 5.74 51.5
5.80 56.3 5.82 55.6
5.92 60.1 5.93 59.4
5.98 63.1 5.98 62.1
5.98 65.2 5.98 64.5
Y
2
5.10 67.9 5.22 66.9
4.37 68.9 4.44 68.6
4.14 69.9 4.25 69.3
●●● ●●● ●●● ●●●
●●● ●●● ●●● ●●●
5.55 34.1 5.52 32.8
5.60 41.6 5.61 40.3
5.70 47.1 5.78 45.4
5.76 51.5 5.78 49.5
5.76 55.3 5.61 51.2
5.70 59.4 5.35 54.0
5.56 59.7 5.25 54.6
Y
1
5.19 60.1 4.80 56.0
4.63 60.7 4.45 57.0
4.05 61.4 3.92 58.0
- (02 - 12) -
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
75°F DB 78°F DB
PI TC PI TC
5.60 34.8 5.62 33.8
5.66 46.7 5.68 45.7
5.77 50.8 5.79 49.8
5.86 54.9 5.88 54.3
5.95 58.7 5.96 58.0
5.98 61.4 5.98 60.4
5.98 63.8 5.98 63.1
5.45 66.2 5.84 65.2
4.73 67.9 5.05 67.2
4.39 68.6 4.61 67.9
●●● ●●● ●●● ●●●
●●● ●●● ●●● ●●●
5.50 31.4 5.48 31.0
5.62 38.6 5.64 37.5
5.75 44.0 5.72 42.7
5.74 47.1 5.68 43.7
5.23 47.8 4.92 45.0
4.89 49.5 4.55 46.1
4.80 50.2 4.53 46.7
4.61 51.2 4.33 47.4
4.36 52.5 4.08 48.5
3.81 56.0 3.73 53.9
X1 = 100 % X = 120 %
Y1 = 54.0 Y
2. MODEL SELECTION
1
.
1
PI
5.64
5.70
5.81
5.90
5.97
5.98
5.98
5.98
5.17
4.88
●●●
●●●
5.45
5.66
5.40
5.38
4.79
4.46
4.37
4.05
3.77
3.51
X2 = 120 %
Y2 = 62.1