Start/Stop Levels - Benchmark BMK 1500 User Manual

3.10 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:
Start Level:
Stop Level:
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 3-7 for the relationship between the energy input and Air/Fuel Valve position for a BMK
1500 MBH boiler running on natural gas.
BMK 1500:
Table 3-7a:
Air/Fuel Valve
Position
(% Open)
16% (Stop Level)
20%
30%
40%
50%
60%
70%
80%
90%
100%
BMK 2000:
Table 3-7b:
Air/Fuel Valve
Position
(% Open)
16% (Stop Level)
20%
30%
40%
50%
60%
70%
80%
90%
100%
OMM-0097_0C
GF-142
Benchmark 1500 - 2000 Boilers
CHAPTER 3 – OPERATION
BMK 1500
24%
16%
Relationship Between Air/Fuel Valve Position and
Energy Input Running On Natural Gas
Energy Input
(BTU/Hr)
76,000
127,000
366,000
629,000
822,000
977,000
1,119,000
1,255,000
1,396,000
1,502,000
Relationship Between Air/Fuel Valve Position and
Energy Input Running On Natural Gas
Energy Input
(BTU/Hr)
100,000
143,000
388,000
759,000
1,069,000
1,283,000
1,476,000
1,675,000
1,833,000
2,000,000
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
BMK 2000
24%
16%
Boiler Energy Input
(% of Full Capacity)
5.0%
8.5%
24.4%
41.9%
54.7%
65.0%
74.5%
83.5%
92.9%
100%
Boiler Energy Input
(% of Full Capacity)
6.7%
11%
23%
37%
51%
61%
74%
83%
93%
100%
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