Chapter 2 — Burner Operation and Control
2-8 Part No. 750-184
the air pump is present for oil firing. Oil valve(s) will not open, or
will not remain open, unless switch contacts are closed.
3. Atomizing Air Pressure Gauge: Indicates the atomizing air
pressure at the burner gun
4. Oil Solenoid Valve: Opens when energized through contacts in
the programmer and allows fuel oil flow from the oil metering
valve to the burner nozzle. A light oil fired burner uses two valves
operating simultaneously.
5. Fuel Oil Controller: An assembly combining into a single unit the
gauges, regulators and valves required for regulating the flow of
fuel oil. All controllers have the following integral parts. In
addition to these, the controller used on a No. 6 oil fired burner
has additional components described in Section I.
A. Oil Metering Valve: Valve metering stem moves to increase
or decrease the orifice area to regulate the supply of fuel oil
to the burner nozzle in accordance with boiler load
variances. Stem movement is controlled by the modulating
motor through linkage and the oil metering cam.
B. Oil Modulating Cam: Assembly consisting of a quadrant, a
series of adjustable allen-head screws and a contour spring
provided for adjustment of oil input at any point in the
modulating range.
C. Oil Burner Pressure Gauge: Indicates pressure of the fuel oil
at the metering valve.
D. Oil Pressure Regulator: For adjustment of the pressure of oil
at the metering valve.
6. Oil Relief Valve: Maintains a constant oil supply pressure to the
fuel oil controller by bypassing excess fuel oil.
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