Appendix 3 - Mach Boiler Altitude Derate Schedule - Harsco Industrial C1500H Installation & Owner's Manual

8.3 A 3 – MACH
PPENDIX
For installations over 2000 ft elevations, a derate schedule is applied. The boiler input rating must be reduced by 4%
per 1000 ft.
This is illustrated using the following graph.
45
40
35
30
25
20
15
10
5
0
2000 3000
Derate procedure is as follows:
With the boiler at high fire, adjust the gas valves (as described in section 3.10.4) to get 5% O
cannot be achieved, perform the following steps:

If the O % is too high, then the inlet gas pressure should be adjusted to the minimum pressure allowed,
2
typically 5" W.C. The gas valve should be adjusted to obtain approximately 5% O
high, the fan speed may be lowered. This procedure should only be performed by factory trained personnel.

If the O % is too low, then the gas valve settings should be reduced.
2
This procedure is also described in Service Bulletin 06-08.
®
B A D
OILER LTITUDE ERATE SCHEDULE
4% Derate Schedule
4000 5000 6000
Altitude (ft)
7000 8000 9000
83
®
MACH Gas Fired Boiler
10000 11000
in the flue gas. If this
2
. If the O % is still too
2 2