5
Boiler
Size
Fuel
Acceptable Combustion Readings
Approximate Derate per 1000 Ft.
Measured
% CO
2
Measured
% O
2
Max CO
(PM Air-Free)
4501 - 7800 ft. *
(1350 - 2377 m)
7801 - 10200 ft. **
(2377 - 3109 m)
80
NG
8.7-9.1
4.9-5.6
200
0.0%
3.1%
LP
100
NG
8.5-9.3
4.5-6.0
200
0.0%
3.1%
LP
9.9-10.2
5.4-5.8
200
0.9%
3.1%
120
NG
8.8-9.3
4.5-5.4
200
0.0%
3.1%
LP
9.9-10.2
5.4-5.9
200
0.5%
3.1%
150
NG
8.6-9.3
4.5-5.8
200
0.4%
3.1%
LP
9.8-10.3
5.2-6.0
200
1.2%
3.1%
180
NG
8.5-9.1
4.9-6.0
200
1.9%
3.1%
LP
9.9-10.2
5.4-5.8
200
2.4%
*
Derate is referenced from sea level.
**
Derate is referenced from 7800 ft.
Example:
1) 150 Boiler Size using natural gas installed at 6000 ft.
Total derate = (0.4% x 6.0) = 2.4%
2) 150 Boiler Size using natural gas installed at 8800 ft.
Total derate = (0.4% x 7.8) + (3.1% x 1.0) = 6.22%
Fuel
Inlet Pressure (in w.c.)
4501 - 10200 Ft.
Nat. Gas
4.0-14.0
LP
11.0-14.0
Table 3: Boiler Altitude Adjustments 4501 - 10200 Ft. (1350 - 3109 m)
Table 4: Acceptable Gas Inlet Pressure Range
Boiler Size
080
100
120
150
180
PIM High Altitude Repair Kit Part Number
107394-01
107394-02
107394-03
107394-04
107394-05
Altitude
4501 - 10200 Ft.
Maximum Heat Rate (RPM)
6200
7500
7050
7300
7200
Minimum Heat Rate (RPM)
1800
2000
1800
2000
1900
Absolute Maximum Heat Rate (RPM)
7720
7680
7132
7300
7385
Minimum Light-off Rate (RPM)
3500
3500
3500
3500
3500
Maximum Light-off Rate (RPM)
4000
4000
4000
4000
4000
Table 5: High Altitude Specific Parameters
