Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
CHAPTER 3 – OPERATION
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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:
Start Level:
22%
Stop Level:
18%
Normally, these settings should not require adjustment.
Note that the energy input of the Heating Boiler is not linearly related to the Air/Fuel Valve
position.
The Tables below show the relationship between the energy input and Air/Fuel Valve position.
Table 3-8a:
BMK 750:
Air/Fuel Valve Position and Energy Input Relationship
Air/Fuel Valve
Position
(% Open)
Energy Input
(BTU/Hr)
Heating Boiler Energy
Input
(% of Full Capacity)
0%
0
0
10%
0
0
18% (Stop Level)
50,000 (14.7 kW)
6.7%
20%
52,000 (15.2 kW)
6.9%
30%
108,000 (31.7 kW)
14%
40%
246,000 (72.1 kW)
33%
50%
369,000 (108.1 kW)
49%
60%
465,000 (136.3 kW)
62%
70%
554,000 (162.4 kW)
74%
80%
637,000 (186.7 kW)
85%
90%
733,000 (214.8 kW)
98%
100%
750,000 (219.8 kW)
100%
Table 3-8b:
BMK 1000:
Air/Fuel Valve Position and Energy Input Relationship
Air/Fuel Valve
Position
(% Open)
Energy Input
(BTU/Hr)
Heating Boiler Energy
Input
(% of Full Capacity)
0%
0
0
10%
0
0
18% (Stop Level)
50,000 (14.7 kW)
5%
20%
54,000 (15.8 kW)
5.4%
30%
140,000 (41.0 kW)
14%
40%
297,000 (87.0 kW)
30%
50%
443,000 (126.9 kW)
44%
60%
564,000 (165.3 kW)
56%
70%
660,000 (193.4 kW)
66%
80%
789,000 (231.2 kW)
79%
90%
933,000 (273.4 kW)
93%
100%
1,000,000 (293.1 kW)
100%