Appendix B - Boiler Altitude Derate Schedule - Patterson-Kelley P-K MACH CM300 Installation & Owner's Manual

Appendix B – Boiler Altitude Derate Schedule
For installations over 2,000 ft. elevations, a derate schedule is applied. The boiler input rating must be
reduced by 4% per 1,000 ft. which is illustrated in the graph below.
Although the appliance's capacity is reduced due to the lower air density, the combustion tuning should
follow the standard combustion guidelines of Sections
same O and CO levels as discussed in Sections
2 2
Revised: January 3, 2020
Released: January 3, 2020
3.11.2
3.11.2
 Patterson-Kelley 2020
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P-K MACH
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& 3.11.3. Tune the combustion for the
& 3.11.3.
1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
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Gas Fired Boiler
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