CleaverBrooks CBEX Elite, Эксплуатация и обслуживание

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Burner and Fuel System
2-6 750-368
CBEX Elite 100-1200 HP
2.5 — Controls for Combination Burners Only
Gas-Oil Switch: Burners equipped to burn either oil or gas include equipment for each fuel. The selector switch
engages the appropriate interlocks and controls for gas or oil operation. Chapter 4 details the required functions
of each fuel system.
2.6 — Combustion Air
Air for combustion of fuel (referred to as “secondary” air) is furnished by the forced draft fan mounted in the
boiler head. In operation, air pressure is built up in the entire head and is forced through a diffuser plate for a
thorough mixture with the fuel for proper combustion. The supply of secondary air to the burner is governed by
automatically throttling the output of the fan by regulating the rotary air damper. The damper provides the proper
amount of air for correct ratio of air to fuel for efficient combustion at all firing rates.
The use of a Variable Speed Drive (VSD), optional, works in conjunction with the air damper actuator. When high
fire is not required the VSD reduces amperage to the fan motor, reducing energy consumption and the corre-
sponding air flow simultaneously.
FIGURE 2-4.
Secondary Air Flow Diagram
Fuel Oil Pump Transfers fuel oil from the storage tank and delivers it under pressure to the burner
system.
Air Pump Module Assembly Provides the compressed air required to atomize the fuel oil for proper combus-
tion. It is started automatically by the programmer’s sequence.
Component Description