Mach ® Boiler Altitude Derate Schedule - Harsco Industrial MACH C1500GG Installation & Owner's Manual

®
8.4 M B
ACH OILER
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
gas. If this 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
2
allowed, typically 5" w.c. The gas valve should be adjusted to obtain approximately 5% O
O % is still too high, the fan speed may be lowered. This procedure should only be performed by
2
factory trained personnel.
If the O % is too low, then the gas valve settings should be reduced.
2
This procedure is also described in Bulletin 06-08.
A D S
LTITUDE ERATE CHEDULE
4% Derate Schedule
4000 5000 6000
Altitude (ft)
7000 8000 9000
59
MACH® Gas-Fired Boiler
10000 11000
in the flue
2
. If the
2