Starting and Operating Instructions
4-6
750-96 (revised 2010)
Model CB Packaged Boiler Manual
4.6 — Firing Preparations for No. 4 Oil: Series 800-900
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 4.4. The schematic flow diagram in Chapter 1 indicates the flow
of fuel and atomizing air.
If the burner is a combination fuel model, make 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.
4.6.1 — Oil Flow
Open all valves in the oil suction and oil return lines. Momentarily energize the fuel oil pump starter to check for
proper pump rotation. With rotation verified, prime the suction line strainer with oil and start the fuel oil pump by
closing its power entrance switch. Observe the pressure gauge on the fuel oil controller for indication that oil flow
is established. If no pressure shows after a few moments, stop the oil pump and re-prime. If oil flow is not estab-
lished after priming the pump on one or more occasions, conditions preventing oil flow must be determined and
corrected to avoid damage to the pump’s internal mechanism.
A vacuum (or a compound pressure-vacuum) gauge should be installed in the oil suction line and its reading
observed and recorded for future guidance. This gauge reveals the tightness of the system.
4.6.2 — Oil Pressure
As soon as it is determined that oil is flowing through the controller, adjust the pressure relief valve if necessary to
obtain 42 to 45 psi. The pressure will fluctuate slightly during the firing cycle. If it is erratic prior to firing or does
not respond to adjustment, possibly air is trapped in the line or there may be a leak in the suction line. The tight-
ness of the suction line can be determined by reference to a vacuum gauge. If air is trapped in the line, turn out
the relief valve adjusting screw so that there is no pressure on the valve. This will generally permit the free flow of
any trapped air through the valve. Turn the adjusting screw to obtain the necessary pressure.
If the preceding does not prove to be the problem, it is possible that foreign matter may have lodged under the
seat of the back pressure regulator valve. In this case the valve will have to be disassembled and carefully
cleaned. Final regulation of oil flow to the nozzle may be done later, if necessary, by adjusting the metering cam
screws as outlined in Chapter 5.
After the burner is firing and with properly heated oil, further adjustments can be made, if necessary, to this valve.
4.6.3 — Oil Temperature
When oil flow is ascertained, turn the oil heater switch to “on.”
The electric oil heater has a built in adjustable thermostat. The normal temperature requirement is 100º F. Should
adjustment be necessary, turn the adjusting screw and use the thermometer in the fuel oil controller as a guide to
the proper temperature.
Before turning on the oil heater switch, make certain that the heater shell is filled with fuel oil as indicated by a pres-
sure reading on the fuel oil pressure gauge.
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