CleaverBrooks 4WI - 5.3 - Gas Pilot; 5.4 - Atomizing Air

Starting and Operating Instructions
5-4
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
In the event the boiler is equipped with optional control devices not listed here, be certain to ascertain that their
settings are correct. If additional information is required, see your local Cleaver-Brooks authorized representative
or contact Cleaver-Brooks.
On initial startup or whenever the boiler is placed into operation from a “cold” start, the manual-automatic selector
switch should be set at “manual” and the flame safeguard control set at “close.” 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 con-
trolled by the modulating control 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 linger-
ing 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.
Check the oil level of the air intake strainer.
FIGURE 5-3. Atomizing Air Pump
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.