750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
5-7
5.6 — Firing Preparation for No. 6 Oil (Series 400 - 600)
4. The pressure gauge will indicate a higher reading when the flame is present and will increase as the firing rate
increases. After the burner is firing and when the air pump is running, final adjustment can be made at the fuel
oil controller.
5. 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.
5.5.3 — Starting
When all the conditions covered in Sections 5.1 through 5.5 are assured, the burner is ready for firing. Refer to Sec-
tion 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 (see 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 switch to “oil.” Insert the burner drawer gun into its most forward position and latch it in place.
5.6.1 — Oil Flow
1. Open all valves in the oil suction and oil return lines.
2. Open the bypass valve on the fuel oil controller until oil flow is established. Normally, the orifice valve is left in
a closed position. however, on cold starts, it may be opened for brief periods to aid in establishing oil flow. The
bypass and orifice valves must be returned to the closed positions as soon as oil flow is established as indicated
by a reading on the oil supply pressure gauge. Do not at temp to set pressures while valves are open.
FIGURE 5-4. No. 6 Fuel Oil Control
NOTE: Prior to firing, attach combustion analysis instruments and monitor consistently throughout the startup
sequence. Refer to the adjustment procedures in Chapter 6.
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