750-96 (revised 2010)
Model CB Packaged Boiler Manual
5-1
CHAPTER 5 Adjustment Procedures
5.1 — Overview
While each boiler is tested for correct operation before shipment from the factory, variable conditions such as
burning characteristics of the fuel and operating load conditions may require further adjustment after installation
to assure maximum operating efficiency and economy.
A combustion efficiency analysis made during the initial startup will help to determine what additional adjustments
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 or mis-adjustments
occurred during shipment and installation.
The adjustment procedures in this chapter apply to standard components furnished on steam or hot water boilers
fired with gas and/or the various grades of oil.
Contact your Cleaver-Brooks representative or the Cleaver-Brooks Service Department for recommendations cov-
ering special controls that are not included in this chapter.
5.2 — Linkage: Modulating Motor and Air Damper
The linkage consists of various arms, connecting rods, and swivel ball joints that transmit motion from the modu-
lating motor to the metering cam(s), to the rotary air damper, and to the gas butterfly valve, if used.
When properly adjusted, a coordinated movement of the damper and metering cams within the limits of the modu-
lating motor travel is attained to provide proper fuel-air ratios through the firing range.
In linkage adjustments there are several important factors that must serve as guides:
• The modulating motor must be able to complete its full travel range. Restrictions will cause definite damage to
this motor.
• Initial adjustment should be made with the motor in full closed position, that is with the shaft on the power end
of the motor in its most counterclockwise position.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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