Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 3 - START SEQUENCE
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 51 of 122
3.3 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:
TABLE 3-1a: Start/Stop Levels – NATURAL GAS
BMK 750 BMK 1000 BMK 1500 BMK 2000 BMK 2500 BMK 3000
Start Level:
22% 22% 24% 24% 24% 20%
Stop Level:
18% 18% 16% 18% 16% 14%
TABLE 3-1b: Start/Stop Levels – PROPANE GAS
BMK 750 BMK 1000 BMK 1500 BMK 2000 BMK 2500 BMK 3000
Start Level:
22% 22% 24% 24% 26% 22%
Stop Level:
18% 18% 18% 18% 18% 14%
Normally, these settings do not require adjustment.
Note that the energy input of the boiler is not linearly related to the Air/Fuel Valve position.
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