Starting and Operating Instructions
5-2
750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
Check all linkage for full and free movement of the damper and metering valves and cams. The check can be done
by loosening the linkage at the damper motor connecting arm and manipulating the linkage by hand.
Check for rotation of all motors by momentarily closing the motor starter or relay. The blower impeller rotation is
counterclockwise when viewed from the front of the boiler. The air pump rotation is clockwise when viewed from
its drive end. When operating a standard 78” boiler, the fan motor and air pump should rotate counterclockwise.
Before operating the boiler feed pump or oil supply pump, be sure all valves in the line are open or properly posi-
tioned.
For safety reasons, perform a final pre-startup inspection, especially checking for any loose or incomplete piping or
wiring or any other situations that might present a hazard.
5.2 — Control Settings: Steam and Hot Water
See Chapter 6 for adjustment instructions for the following controls:
5.2.1 — Operating Limit Control
Inspect the operating limit control for proper setting.
• The operating limit pressure control of a steam boiler should be set slightly above the highest desired steam
pressure, but at least 10% lower than the setting of the safety valve.
• The operating limit temperature control on a hot water boiler should be set slightly above the highest desired
water temperature and within the limits of the pressure vessel.
5.2.2 — High Limit Control
Inspect the high limit control for proper setting.
• On a high pressure steam boiler, the control should be set approximately 10 psig above the operating limit pres-
sure control setting, if feasible, or midway between the operating limit pressure and the safety valve setting. The
setting on a low pressure steam boiler may be 2 or 3 psig above the operating limit setting, but must not exceed
the safety valve setting.
Prior to firing a boiler, be sure that discharge piping from safety valves or relief valves, and discharge piping from all
blowdown and drain valves, is piped to a SAFE point of discharge, so that emission of hot water or steam cannot pos-
sibly cause injury. Failure to do so could result in serious injury or death.
NOTE: The pressure vessel support legs are welded to mounting skids in front and secured by bolts at the rear of the
pressure vessel. The bolts are tightened for shipment. When the boiler is installed, and prior to initial firing, the bolts
securing the rear legs to the skid must be loosened to allow for expansion and contraction caused by differences in
temperature between pressure vessel and skids and to avoid damage to the equipment.
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