Section 5 — Commissioning Hawk 1000
5-8 Part No. 750-366
Figure 5-13. Combustion curve complete
5.3 Setting Combustion - Single Point Positioning
5.3.1 VFD or O2 Trim
If VFD or O2 Trim is selected, combustion setup is identical to parallel positioning, with the exception that
only the air actuator will be active. 8 points minimum are required for the combustion curve, with 16 points
maximum.
5.3.2 No VFD or O2 Trim
The combustion curve consists of 2 points. Only the air actuator will be active. Point 1 will be low fire; Point
2 will be high fire.
5.4 Setting Combustion - Low/High/Low
Low/High/Low combustion is only available with Cleaver-Brooks Model 4/Model 5 boilers.
Low/High/Low is only available for Oil (as Fuel 2). The combustion curve consists of 2 points; only the air
actuator is active. Point 1 will be low fire; Point 2 will be high fire.
A View/Adjust Setpoints screen is provided.
Figure 5-14. View/Adjust Setpoints
When using Low/High/Low combustion the boiler firing rate will be either 0% or 100%. The oil valves open
and close based on the air actuator feedback percent. The high fire and low fire setpoints are limited by the
Boiler On and Boiler Off points.
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