750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
5-7
5.6 — Firing Preparation for No. 6 Oil (Series 400-600)
Adjustment may also be required to the regulator on the fuel oil controller. The pressure regulating valve is
equipped with tubing that directs and adds atomizing air pressure to the adjustable spring pressure. Since the air
pump is not running at this time, only tentative adjustment can be made. Without the air supply, adjust the fuel oil
pressure regulator so that the oil burner gauge registers approximately 35 psi.
FIGURE 5-7. Fuel Oil Controller
The pressure gauge will indicate a higher reading when air is present and the flame exists and will increase as the fir-
ing rate increases. After the burner is firing and when the air pump is running, final adjustment can be made at the
fuel oil controller.
Final regulation of oil flow to the nozzle can be done later, if necessary, by adjusting the metering cam screws as
outlined in Chapter 6.
When all the conditions covered above and in Sections 5.1, 5.2, 5.3, 5.4, and 5.5 are assured, the burner is ready for
firing. Refer to Section 5.8 for further starting and operating information.
5.6 — Firing Preparation for No. 6 Oil (Series 400-600)
Prior to initial firing, oil flow, pressure and temperature should be established and verified. Atomizing air pressure
should also be established as outlined in Section 5.4. The schematic flow diagram in Chapter 2 indicates the flow of
fuel and atomizing air.
If the boiler is a combination fuel model, be certain that the main gas shutoff cock is closed and set the gas/oil
selector to “oil.” Insert the burner drawer gun into its most forward position and latch it in place, depressing the oil
drawer switch.
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