750-368
CBEX Elite 100-1200 HP
6-1
CHAPTER 6 Adjustment Procedures
6.1 — Overview
Each Cleaver-Brooks boiler is tested for correct operation before shipment from the factory. However, variable
conditions such as burning characteristics of the fuel and operating load conditions may require further adjust-
ment after installation to assure maximum operating efficiency and economy.
A combustion efficiency analysis made during the initial startup will help to determine what additional adjust-
ments are required in a particular installation.
Prior to placing the boiler into service, a complete inspection should be made of all controls, connecting piping,
wiring, and all fastenings such as nuts, bolts, and setscrews to be sure that no damage has occurred, or that
adjustments have not changed during shipment and installation.
The adjustment procedures in Chapter 6 apply to standard components furnished on steam or hot water boilers
fired with gas and/or light oil.
In order to reduce stress on boiler components and to improve boiler operating efficiency, burners have been
designed for enhanced fuel turndown capabilities.
Contact the local Cleaver-Brooks authorized representative or the Cleaver-Brooks Service Department for recom-
mendations covering special controls that are not included in this chapter.
6.2 — Burner Operating Controls: General
The term ‘controls’ is used in this manual to refer to:
• The Operating Limit and High Limit controls, hardware devices which turn the boiler on and off according to
their respective switch settings.
• The Modulating and Flame Safeguard controls, which provide for modulated firing and burner sequencing/
flame supervision. On a standard CBEX Elite these functions are managed by the Hawk integrated control sys-
tem, comprising both hardware (PLC, Input/Output devices, and touchscreen HMI) and software (program-
ming for the PLC and HMI).
The limit controls are described below; for a complete description of the Hawk including adjustment procedures,
see the manual provided with the boiler control system.
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