Oil System - CleaverBrooks CBEX Elite Operation And Maintenance

2.4 — Oil System
Component
11. High Gas Pressure Switch
12. Butterfly Gas Valve (not
shown)
2.4 — Oil System
The following items are applicable to all oil fired or combination fired boilers.
Component
Oil Drawer Switch
Atomizing Air Proving Switch
Atomizing Air Pressure Gauge
Oil Solenoid Valves
Fuel Oil Controller
Oil Relief Valve
Terminal Block
Fuel Oil Strainer
Back Pressure Orifice
Low Oil Pressure Switch
(optional)
750-368
CBEX Elite 100-1200 HP
A pressure actuated switch that is closed whenever main gas line pressure is
below a preselected pressure. Should the pressure rise above the setting, the
switch contacts will open a circuit causing the main gas valve(s) to close, or pre-
vent the burner from starting. The switch is usually equipped with a device that
must be manually reset after being tripped.
The pivoted disc in the valve is actuated by connecting linkage from the gas mod-
ulating cam to regulate the rate of gas flow to the burner.
Opens the limit circuit if the oil drawer burner gun is not latched in the forward
position required for burning oil.
Pressure actuated switch whose contacts are closed when sufficient atomizing air
pressure from the air pump is present for oil firing. Oil valve(s) will not open, or
will not remain open, unless switch contacts are closed.
Indicates the atomizing air pressure at the burner gun.
Opens when energized through contacts in the programmer and allows fuel oil to
flow from the oil metering valve to the burner nozzle. A light oil fired burner uses
two valves operating simultaneously.
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 inte-
gral 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 accor-
dance with boiler load variances. Stem movement is controlled by the oil
fuel actuator.
B. Oil Burner Pressure Gauge: Indicates pressure of the fuel oil at the metering
valve.
C. Oil Pressure Regulator: For adjustment of the pressure of oil at the metering
valve.
Maintains a constant oil supply pressure to the fuel oil controller by bypassing
excess fuel oil.
Provides connections for fuel oil supply piping.
Prevents foreign matter from entering the burner system.
A restriction located in the oil return line immediately downstream of the fuel oil
controller to create back pressure (100 and 200 series only).
Switch contacts open when the fuel oil pressure drops below selected pressure.
Switch will interrupt the limit circuit upon loss of sufficient fuel oil pressure for
correct combustion.
Description
Description
2-5