Carrier 38VMA Series - Page 23

Capacity Zone a b c d e f
Factor B 3 2.5 2 1 0.1 0
Ambient temperature T4
T4 ≥ 86⁰F
75⁰F ≤ T4 < 86⁰F
63⁰F ≤ T4 < 75⁰F
T4 correction factor C
100%
90%
80%
Ambient temperature T4
54⁰F ≤ T4 < 63⁰F
45⁰F ≤ T4 < 54⁰F
36⁰F ≤ T4 < 45⁰F
T4 correction factor C
50%
40%
30%
Ambient temperature T4
5⁰F ≤ T4 < 36⁰F
T4 < 5
⁰
F OR T4≥131
⁰
F
T4 correction factor C
30%
0
QCi: Total cooling capacity for indoor units
QCi=∑(AxB) x C (Round number)
Table 7 - Outdoor unit cooling capacity calculation
Outdoor Unit Capacity x 1000BTU Outdoor Unit Capacity (HP) D
72 8
96 10
120 12
144 14
QCo: Outdoor unit cooling capacity
QCo = QCix D/∑D (Round number)
T2B correction factor E
T = 47⁰F (default)
QCr: outdoor unit real cooling Capacity
QCr = QCo + E
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