Carrier 38VMA Series, Руководство по обслуживанию, Страница: 25 / 112

Table 9 - Outdoor unit heating capacity calculation
Outdoor Unit Capacity x 1000 BTU Outdoor Unit Capacity (HP) D
72 8
96 10
120 12
144 14
QHo: Outdoor Unit Heating Capacity
QHo = QHi
x D/∑D
（
Round number
）
T2A correction factor E
T = 102
⁰
F (default)
QHr: Outdoor Unit Real Heating Capacity
QHr = QHo + E
For example
：
Outdoor Unit 72 + 96
，
Heating Indoor Unit (12K x 6) + (18K x 6)
，
T1 = 63
⁰
F
，
TS = 70
⁰
F
，
T4 = 45
⁰
F
，
T2A (average) = 93
⁰
F
T1 – TS = 63 – 70 = -7
，
so B = 2
T4 = 45
，
so C = 100%
T2A (average) = 93
⁰
F
，
so E = 6
QHi = ∑(AxB) x C =
（
1.2 x 2 x 6 + 2.0 x 2 x 6
）
x 100% = 38.4
，
Round number
：
39
72 outdoor unit capacity
：
QHo = QHix D / ∑D = 39 x 8 /
（
8 + 10
）
= 17.3
，
Round number
：
18
96 outdoor unit capacity
：
QHo = QHix D / ∑D = 39 x 10 /
（
8 + 10
）
= 21.6
，
Round number
：
22
72 outdoor unit actual capacity
：
QHr = QHo + E =18 + 6 = 24
，
From the frequency table
：
70Hz
96 outdoor unit actual capacity
：
QHr = QHo + E = 22 + 6 = 28
，
From the frequency table
：
78Hz
NOTES:
TS: Indoor unit setting temperature
T1: Room temperature
T2A: Temperature of evaporator inlet
T2B
：
Temperature of evaporator outlet
T4: Ambient temperature
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