CleaverBrooks 4WI - Control and Component Function; Components Common to All Boilers

750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
2-3
2.3 — Control and Component Function
2.3 — Control and Component Function
The term “control” covers the more important valves and components, including, but not limited to electrical con-
trols or those monitored by the Hawk ICS and program relay. The operator must become familiar with the individ-
ual functioning of all controls before understanding boiler operation and procedures outlined in this manual.
The actual controls furnished with any given boiler will depend upon the type of fuel for which it is equipped, and
whether it is a hot water or steam boiler. Refer to the applicable group or groups within Chapter 2 that apply to the
particular boiler.
Boilers with optional features may have control components not listed here.
2.4 — Components Common to all Boilers
FIGURE 2-4. Steam Boiler Components and Controls
Component/Control 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.