Starting and Operating Instructions
4-12
750-96 (revised 2010)
Model CB Packaged Boiler Manual
4.10 — Startup, Operating, Shutdown: All Fuels
Depending upon the fuel being burned, the applicable previous sections in this chapter should be reviewed for pre-
liminary instructions.
When firing with oil make certain that the burner gun is in its most forward position and latched in place. When fir-
ing with gas, the burner gun should be properly withdrawn and latched in place. The fuel selector switch should be
accordingly set to either “oil” or “gas.”
Set the manual-automatic switch to “manual” and turn the manual flame control to “close.”
Turn the burner switch to “on.” The load demand light should glow. the low water level light should remain out, indi-
cating a safe water level in the boiler.
The programmer is now sequencing. See Chapter 3 for sequence details.
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 re-setting the lockout switch.
After main flame ignition, the burner should be left on manual control at its low fire setting (that is, with manual
flame control at “close”) for about 30 minutes or until the boiler is properly warmed, unless it reaches its normal
operating pressure or temperature sooner.
In the case of a steam boiler, CLOSE THE TEST VALVE when steam begins to appear.
A hot water boiler must have a continuous flow of system water through the vessel during the warm-up period. The
entire water content of the system and boiler must be warmed prior to increasing fuel input.
If flame at low fire setting is insufficient to reach normal operating pressure or temperature after 30 minutes, grad-
ually increase the firing rate by turning the manual flame control in one point increments to no higher than the mid-
point between close and open. Operate at this increased fuel input rate for a period of time until an increase is
noted in pressure or temperature. Sustained operation of the boiler should never be maintained when the manual
control is set beyond midpoint.
After the unit 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 adjustment procedures in Chapter
5. After making the high fire adjustment manually, position the burner over the range from high to low fire, stop-
ping at intermediate points, analyzing combustion gases, and adjusting as required.
NOTE: On an initial starting attempt, several efforts might be required to accomplish “bleeding” of fuel lines, main, or
pilot. If ignition does not then occur, do not repeat unsuccessful attempts without re-checking the burner and pilot
adjustment.
Do not re-light the pilot or attempt to start the main burner, either oil or gas, if combustion chamber is hot and/or if
gas or oil vapor combustion gases are present in the furnace or flue passages. The burner and control system is
designed to provide a “pre-purge” period of fan operation prior to establishing ignition spark and pilot flame. Do not
attempt to alter the system or take any action that might circumvent this feature.
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