Start/Stop Levels; Start/Stop Levels - Air/Fuel & Energy Input; Benchmark 5000 Air/Fuel Valve Position And Energy Input - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 3: START SEQUENCE

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:
BMK 5000/6000 Start/Stop Levels for Natural Gas
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.
3.4 START/STOP LEVELS – AIR/FUEL & ENERGY INPUT
The Tables in this section show the relationship between the energy input and Air/Fuel Valve
position for the BMK models covered in this document.

3.4.1 Benchmark 5000 Air/Fuel Valve Position and Energy Input

BMK 5000 Air/Fuel Valve Position and Energy Input
Air Fuel Valve
Position
(% Full Open)
0%
10%
18% (Stop Level)
30%
40%
50%
60%
70%
80%
90%
100%
BMK 5000 Gas Pressure De-Rating Chart
Gas Pressure @ SSOV
in inches W.C. (kPa)
Inlet
56" (13.9 kPa)
14" (3.49 kPa)
10" (3.23 kPa)
OMM-0123_E • GF-207 • 12/17/2019
24%
18%
Boiler Energy Input
BTU/Hr
0
0
400,000 (117 kW)
997,217 (292 kW)
1,667,848 (489 kW)
1,992,380 (584 kW)
2,486,881 (729 kW)
2,981,381 (874 kW)
3,780,230 (1108 kW)
4,375,500 (1282 kW)
5,000,000 (1465 kW)
Energy Input in
Outlet
6.8" (1.70 kPa)
5,000,000 (1465 kW)
6.8" (1.70 kPa)
5,000,000 (1465 kW)
6.8" (1.70 kPa)
5,000,000 (1465 kW)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
% of Full
Capacity
0%
0%
8%
20%
33%
40%
50%
60%
76%
88%
100%
Oxygen
BTU/hr (%O
2
5.7
5.7
5.7
DeRating
) (% Full Fire)
0%
0%
0%
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