Start/Stop Levels - Aerco BENCHMARK 2500DF User Manual

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual

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:
Natural Gas
Propane Gas
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 and 3-9 for the relationship between the energy input and Air/Fuel Valve position for a
BMK 3000 MBH boiler running on natural gas or propane.
Refer to Table 3-10 and 3-11for the relationship between the energy input and Air/Fuel Valve position for
a BMK 2500 MBH boiler running on natural gas or propane.
Table 3-8: Relationship Between Air/Fuel Valve Position and Energy Input
For 3000 MBH Unit Running On NATURAL GAS
Air/Fuel Valve
Position (% Open)
14% (Stop Level)
20%
30%
40%
70%
80%
90%
100%
Table 3-9: Relationship Between Air/Fuel Valve Position and Energy Input
Air/Fuel Valve
Position (% Open)
18% (Stop Level)
30%
40%
50%
60%
70%
80%
90%
100%
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05/21/2014
CHAPTER 3 – OPERATION
Start Level:
Stop Level:
Start Level:
Stop Level:
Energy Input
(BTU/Hr)
200,000
320,000
690,000
1,110,000
2,210,000
2,490,000
2,780,000
3,000,000
For 3000 MBH Unit Running On PROPANE Gas
Energy Input
(BTU/Hr)
200,000
520,000
920,000
1,270,000
1,570,000
1,960,000
2,330,000
2,700,000
3,000,000
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
BMK 3000DF BMK 2500DF
22% 24%
14% 16%
24% 26%
18% 18%
Boiler Energy Input
(% of Full Capacity)
Boiler Energy Input
(% of Full Capacity)
6.7%
11%
23%
37%
74%
83%
93%
100%
6.7%
17%
31%
42%
52%
65%
78%
90%
100%
OMM-0099_0A
GF-145