Carrier 38VMA Series Service Manual page 23

Capacity Zone a
Factor B 3
Ambient temperature T4
T4 correction factor C
Ambient temperature T4
T4 correction factor C
Ambient temperature T4
T4 correction factor C
QCi: Total cooling capacity for indoor units
Table 7 - Outdoor unit cooling capacity calculation
QCi=∑(AxB) x C (Round number)
Outdoor Unit Capacity x 1000BTU
72
96
120
144
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
b c
2.5 2
T4 ≥ 86⁰F
100%
54⁰F ≤ T4 < 63⁰F
50%
5⁰F ≤ T4 < 36⁰F
30%
Outdoor Unit Capacity (HP) D
8
10
12
14
d
1
75⁰F ≤ T4 < 86⁰F
90%
45⁰F ≤ T4 < 54⁰F
40%
T4 < 5⁰F OR T4≥131⁰F
0
e f
0.1 0
63⁰F ≤ T4 < 75⁰F
80%
36⁰F ≤ T4 < 45⁰F
30%
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