Introduction
1-8
750-392
CBEX -DE
1.2.6 — Oil system
The following items are applicable to all oil fired or gas and oil fired boilers.
1. Oil Shutoff 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.
2. 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.
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 oil actuator or in
linkage systems by an oil metering cam.
B - Actuator: Positions the oil metering valve stem.
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.
3. Oil Relief Valve: Maintains a constant oil supply pressure to the fuel
oil controller by bypassing excess fuel oil.
4. Terminal Block: Provides the connection for fuel oil input and return
to storage tank.
5. Fuel Oil Strainer: Prevents foreign matter from entering the burner
system.
6. Pressure Gauge for oil supply pressure
7. Fuel Oil Pump (not shown): Transfers fuel oil from the storage tank
and delivers it under pressure to the burner system.
FIGURE 1-9. Front head oil piping
1
1
2A
2B
2C
2D
FIGURE 1-10. Oil terminal block
3
4
5
6
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