Altitude Correction Chart - ASTEC Phoenix FURY Operation And Service Manual

Altitude Correction Chart

Blowers at Constant Speed *
Altitude Blower
Air Density
Above Sea Correction
3
lb./ft
Level (ft.) Factor
0.077
0 100%
500 0.075 99%
1000 0.074 97%
1500 0.073 96%
2000 0.072 94%
2500 0.071 93%
3000 0.070 92%
0.069
3500 90%
0.068
4000 89%
0.067
4500 87%
5000 0.066 86%
5500 0.065 85%
6000 0.064 84%
6500 0.063 82%
0.062
7000 81%
7500 0.061 80%
0.060
8000 79%
0.059
8500 77%
9000 0.058 76%
9500 0.057 75%
10000 0.057 74%
11000 0.055 72%
12000 0.053 69%
0.051
13000 67%
0.050
14000 65%
0.048
15000 63%
*
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.
The Phoenix burners uses a variable speed drive. This allows it to have its speed raised to compensate for the lower air density.
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.
Burner High Altitude Option:
•
Required for elevations above 3500 ft.
•
Required for fuel atomization.
•
Burner will still derate based on the altitude correction chart.
Phoenix FURY - Operation and Service Manual
Blower Factor vs. Altitude
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
28
Constant Speed *
Altitude (ft.)