Hawk 1000 Section 4 — System Configuration
Part No. 750-366 4-19
Figure 4-17. VFD screen
Variable Frequency Drive for Combustion Air Fan Motor
Variable frequency drives (VFDs) offer many benefits to reduce energy costs and extend the life of mechanical
equipment.
The optional Variable Frequency Drive (VFD; see Figure 2-7) controls the speed of the combustion air fan
motor for the purposes of improving boiler efficiency and reducing electrical energy consumption.
4.4.8 Options
Oxygen Analyzer
The Oxygen (O2) Analyzer (See Figure 2-8) is available for monitoring stack flue gas oxygen concentration. The
O2 Analyzer transmits an analog signal to the controller. The O2 signal is used for Low O2 alarms, Low O2
Shutdown and in calculating boiler efficiency. O2 concentration is displayed on the Boiler Overview and Firing
Rate screens.
Figure 4-18. O2 Analyzer
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