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For example：
outdoor unit 72 + 96, cooling indoor unit (12K x 6) + (18K x 6), T1 = 81⁰F, TS=70⁰F, T4=82⁰F
Max (T2A average, T2B average - 3) = 55⁰F.
T1 – TS = 81 – 70 = 11, so B = 3
T4 = 82, so C = 90%
Max (T2A average, T2B average = 55⁰F, so E = 3
QCi = ∑ (AxB) x C=（1.2 x 3 x 6 + 2.0 x 3 x 6）x 90% = 51.84，Round number：52
72 outdoor unit cooling capacity：QCo = QCix D / ∑D = 52 x 8 /（8 + 10）= 23.1，Round number：24
96 outdoor unit cooling capacity：QCo = QCix D / ∑D = 52 x 10 /（8 + 10）= 28.8，Round number：29
72 outdoor unit actual cooling capacity：QCr = QCo + E = 24 + 3 = 27，From the frequency table：70Hz
Heating capacity calculation
Table 8 -
96 outdoor unit actual cooling capacity：QCr = QCo + E = 29 + 3 = 32，From the frequency table：80Hz
Indoor unit
Indoor unit
capacity (BTU)
capacity x 100W
6000
7000
9000
12000
13000
15000
18000
21000
24000
27000
30000
33000
Capacity Zone
a
Factor B
3
Ambient temperature T4
T4 correction factor C
Ambient temperature T4
T4 correction factor C
QHi: Total heating capacity of indoor units
QHi=∑(AxB) x C (Round number)
Indoor unit
capacity（HP）A
15, 17
0.5
22, 25
0.8
28
1.0
32, 36
1.2
40
1.4
45, 50
1.7
56
2.0
63
2.2
71
2.5
80
3.0
90
3.2
100
3.6
b
2.5
T4 < 20⁰F
140%
50⁰F ≤ T4 < 63⁰F
80%
Indoor unit
capacity (BTU)
36000
42000
48000
54000
60000
66000
72000
96000
120000
144000
168000
192000
c
d
2
1.5
20⁰F ≤ T4 < 32⁰F
120%
63⁰F ≤ T4 < 77⁰F
60%
Indoor unit
Indoor unit capacity
（HP）A
capacity x 100W
112
125
140
160
180
200
224, 252
280
335
400
450
560, 580
e
f
0.5
0
32⁰F ≤ T4 < 50⁰F
100%
77⁰F ≤ T4
0
4.0
4.5
5.0
6.0
6.5
7.0
8.0
10.0
12.0
14.0
16.0
20.0
24
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