Burner and Fuel System
2-2
750-368
CBEX Elite 100-1200 HP
The burner control circuit operates on 115 volt, single-phase 60 Hz (or 50 Hz when equipped) alternating cur-
rent. The forced draft fan motor is generally operated on 3-phase service at the available main power supply volt-
age.
2.2 — Front Head and Panel
Front head, control/entrance panel, and additional components associated with the combustion process are
described below. Boilers with optional features may have components not listed here.
FIGURE 2-1. CBEX Steam Boiler
Component Description
1. Forced Draft Fan Motor Drives forced draft fan directly to provide combustion air. Also referred to as a
blower motor.
2. Forced Draft Impeller Provides all air, under pressure, for combustion of pilot fuel and main fuel, and for
purging.
3. Actuators Independent actuators for fuel, air, and FGR operate to provide proper air/fuel
ratios under all boiler load conditions.
4. Ignition Transformer Provides high voltage spark for ignition of gas pilot or light oil pilot.
5. Flame Detector Monitors gas or oil pilot and energizes the programmer flame relay in response to
a flame signal. It continues to monitor main flame (oil or gas) after expiration of
pilot providing period. A standard equipped boiler has a lead sulfide (infrared sen-
sitive) detector.
6. Stack Thermometer Indicates temperature of vented flue gases.
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