Benchmark 750-3000 Installation & Startup Manual
SECTION 3 - START SEQUENCE
OMM-115_D
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5/9/2019
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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.
