Starting and Operating Instructions
5-14
750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
4. On ignition failure, the flame failure light will glow and the blower will purge the boiler of unburned fuel vapors
before stopping. After ignition failure, wait a few moments before resetting the lockout switch.
5. After main flame ignition, the burner should be set on manual control at its low-fire setting (that is, with manual
flame control at “close”) until the boiler is properly warmed. Close the steam header.
In the case of a steam boiler, CLOSE the test valve when the steam begins to appear.
A hot water boiler must have a continuous flow of system water through the vessel during the warmup period.
The entire water content of the system and boiler must be warmed prior to increasing fuel input.
6. If the flame at low-fire provides insufficient heat to reach normal operating pressure or temperature after 30
minutes, gradually increase the firing rate by turning the manual flame control in one point increments to no
higher than the third cam screw. Operate at the increased fuel input rate for a period of time until an increase is
noted in pressure or temperature.
7. After the boiler is thoroughly warmed, turn the manual flame control to high-fire. At this point a combustion
analysis should be made, with instruments, and fuel flow regulated as required. Refer to the adjustment proce-
dures in Chapter 6. After making the high-fire adjustment, manually decrease the firing rate, stopping at each
cam screw to analyze combustion gasses, and adjust as required.
To properly perform the testing and adjusting, it is necessary that the burner be allowed to fire at a maximum rate
long enough to achieve desired results.
5.9.1 — Operating
Normal operation of the burner should be with the switch in the automatic position and under the direction of the
modulating control. The manual position is provided for initial adjustment of the burner over the entire firing
range. When a shutdown occurs while operating in the manual position at other than low-fire, the damper will not
be in a closed position, thus allowing more air than desired to flow through the boiler.
With the switch set at “automatic,” the burner will operate on a modulating basis according to the load demand.
The burner will continue to operate with modulated firing until the operating limit pressure or temperature is
reached, unless:
Do not re-light the pilot or attempt to start the main burner, either oil or gas, if the combustion chamber is hot and/or
if gas or oil vapor combustion gasses are present in the furnace or flue passages. Failure to follow these instructions
could result in serious injury or death.
The burner and control system is designed to provide a “pre-purge” period of fan operation prior to establishing igni-
tion spark and pilot flame. Do not attempt to alter the system or take any action that might circumvent the “pre-purge”
feature. Failure to follow these instructions could result in serious injury or death.
NOTE: The hot flame to cool air cycling subjects the pressure vessel metal and refractory to undesirable conditions.
!
Warning
!
Warning
To Next Page
Loading...
Need help?
General
