Benchmark 2500 - 3000 Boilers
CHAPTER 3 – OPERATION
Page
50
of
204
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0E
03/20/2014
Ph.: 800-526-0288
GF-137
3.11 START/STOP LEVELS
The start and stop levels are the Air/Fuel Valve positions (% open) that start and stop the unit,
based on load. These levels are Factory preset as follows:
BMK 2500
BMK 3000
Start Level:
24%
20%
Stop Level:
16%
14%
Normally, these settings should not require adjustment.
Note that the energy input of the boiler is not linearly related to the Air/Fuel Valve position. Refer
to Table 3-8 for the relationship between the energy input and Air/Fuel Valve position for a BMK
2500 MBH boiler running on natural gas.
Table 3-8a:
BMK 2500:
Relationship Between Air/Fuel Valve Position and
Energy Input Running On Natural Gas
Air/Fuel Valve
Position (% Open)
Energy Input
(BTU/Hr)
Boiler Energy Input
(% of Full Capacity)
14% (Stop Level)
200,000
6.7%
20%
320,000
11%
30%
690,000
23%
40%
1,110,000
37%
50%
1,530,000
51%
60%
1,820,000
61%
70%
2,210,000
74%
80%
2,490,000
83%
90%
2,780,000
93%
100%
3,000,000
100%
Table 3-8b:
BMK 3000:
Relationship Between Air/Fuel Valve Position and
Energy Input Running On Natural Gas
Air/Fuel Valve
Position (% Open)
Energy Input
(BTU/Hr)
Boiler Energy Input
(% of Full Capacity)
14% (Stop Level)
200,000
6.7%
20%
320,000
11%
30%
690,000
23%
40%
1,110,000
37%
50%
1,530,000
51%
60%
1,820,000
61%
70%
2,210,000
74%
80%
2,490,000
83%
90%
2,780,000
93%
100%
3,000,000
100%
