PHOENIX Talon - Operation and Service Manual
31
Altitude Correction Chart
Altitude
Above Sea
Level (ft.)
0 0.077 100%
500 0.075 99%
1000 0.074 97%
1500 0.073 96%
2000 0.072 94%
2500 0.071 93%
3000 0.070 92%
3500 0.069 90%
4000 0.068 89%
4500 0.067 87%
5000 0.066 86%
5500 0.065 85%
6000 0.064 84%
6500 0.063 82%
7000 0.062 81%
7500 0.061 80%
8000 0.060 79%
8500 0.059 77%
9000 0.058 76%
9500 0.057 75%
10000 0.057 74%
11000 0.055 72%
12000 0.053 69%
13000 0.051 67%
14000 0.050 65%
15000 0.048 63%
*
The Phoenix burners uses a variable speed drive. This allows it to have its speed raised to compensate for the lower air density.
For constant speed blowers, blower capacity, power usage and blower pressure are all related linearly to the density of air. To find a burner's
performance at altitude, multiply the desired property as determined at sea level by the blower correction factor.
Blowers at Constant Speed *
For example: A blower using 75 HP at sea level would use 75 * 0.86 = 64.5 HP at 5000 ft. Likewise if the blower capacity had been 1,000,000 SCFH
at sea level it would be would be reduced to 1,000,000 x 0.86 = 860,000 SCFH at 5000 ft. Additionally if the fan had a static pressure reading of 10
in. H2O at sea level would be reduced to 10 x 0.86 = 8.6 in H2O at 5000 ft. To compensate for this lower density, the fan speed must be raised above
what is listed on the burner profile to obtain the desired static pressure (10 in H2O) and HP (75). Do not exceed the maximum motor speed or the
maximum blower speed, whichever is lower. If you have any questions please contact the burner group for assistance at 423-867-4210.
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
100%
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
Blower Factor
Altitude (ft.)
Blower Factor vs. Altitude
Constant Speed *
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