Altitude/Temperature Correction Factors Imperial; Altitude/Temperature Correction Factors Metric - York DC180 Installation Manual

1.100
1.050
1.000
0.950
0.900
0.850
0.800
0.750
0.700
0.650
0.600
Figure 20: Altitude/Temperature Correction Factors Imperial
1.100
1.050
1.000
0.950
0.900
0.850
0.800
0.750
0.700
0.650
0.600
Figure 21: Altitude/Temperature Correction Factors Metric
The examples below will assist in determining the airflow
performance of the product at altitude.
Example 1: What are the corrected CFM, static pressure, and
BHP at an elevation of 5,000 ft. if the blower performance data
is 6,000 CFM, 1.5 IWC and 4.0 BHP?
Johnson Controls Unitary Products
40 50 60
Air Temperature (ºF)
4.4 10 15.5
Air Temperature (ºC)
70 80 90
21 26.6 32
Solution: At an elevation of 5,000 ft. the indoor blower will still
deliver 6,000 CFM if the rpm is unchanged. However, Table 11
must be used to determine the static pressure and BHP. Since
no temperature data is given, we will assume an air temperature
of 70°F. Table 11 shows the correction factor to be 0.832.
5120416-XIM-C-0216
Sea Level
1000 ft
2000 ft
3000 ft
4000 ft
5000 ft
6000 ft
7000 ft
8000 ft
9000 ft
10000 ft
100
Sea Level
305 Meter
610 Meter
914 Meter
1219 Meter
1524 Meter
1829 Meter
2134 Meter
2430 Meter
2743 Meter
3048 Meter
38
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