Startup and Operation
4-12
750-392
CBEX-DE
Once the main flame is established, turn the burner
switch off and observe that the flame is extinguished
promptly. The flame may continue to burn for a sec-
ond or two after normal shutdown due to the gas
remaining downstream from the fuel valve. If the
flame continues to burn for a longer period or during
blower motor spindown, it could indicate a main gas
valve leak. Immediately turn the burner switch “off”
and close the main gas cock. Investigate and correct
the cause of the valve leakage before relighting the
burner.
FIGURE 4-7. Gas Train
The main gas valve should provide a tight seal, if nothing prevents tight closure. Foreign material may be present
in either the new or renovated gas lines unless adequate care is taken in cleaning and purging.
4.9 — Startup, Operating, and Shutdown: All Fuels
Depending upon the fuel being burned, the applicable previous sections in this chapter should be reviewed for
preliminary instructions.
When firing with oil, be 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ing with gas, the burner gun should be properly withdrawn and latched in place.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 AUTO/MANUAL control to MANUAL.
Turn the burner switch ON. The load demand light should glow. The low-water level light should remain out,
indicating a safe water level in the boiler. The programmer is now sequencing.
Do not relight 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 gases are present in the furnace or flue passages. Failure to follow these instructions
could result in serious injury or death.
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 rechecking the burner and pilot
adjustment.
!
Warning
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