750-368
CBEX Elite 100-1200 HP
5-3
5.3 — Gas Pilot
On initial startup or whenever the boiler is placed into operation from a “cold” start, the manual-automatic selec-
tor should be set at “manual”. After the boiler is in operation and thoroughly warmed, the selector switch should
be turned to “automatic,” so that the burner firing rate may be controlled automatically in accordance with load
demands.
5.3 — Gas Pilot
The gas pilot should be checked for satisfactory performance prior to initial firing. Follow the pilot flame adjust-
ment instructions provided in Chapter 6.
On initial starting attempts, several efforts might be required to fully bleed the pilot line. While checking pilot
adjustment, observe whether the pilot flame is extinguished promptly when the burner switch is opened. A lin-
gering flame indicates a leaking gas pilot valve, which is a condition requiring correction before proceeding.
5.4 — Atomizing Air
The supply and pressure of the atomizing air on an oil-fired burner should be checked. Before starting, inspect
the oil pump lube oil level. Add oil if necessary to bring the level to the mid-point or slightly higher in the sight
glass. Use SAE 20 detergent oil of a grade mentioned in Chapter 8 and fill in accordance with instructions given
there.
FIGURE 5-1. Oil gauge glass
To verify air flow and pressure, place the burner run/test switch on the flame safeguard to the “test” position. If
the burner is a combination fuel burner, be sure that the gas/oil selector switch is set to “oil.” Turn the burner
switch on. The burner will cycle to the low-fire pre-purge position and stop there.
Observe the reading on the air pressure gauge. With no oil flow, the pressure should be a minimum of 7 psi.
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