750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
2-13
2.6 — Additional Controls for Heavy Oil
FIGURE 2-8. Oil Heating Assembly (Steam)
In addition to the components of the fuel oil controller identified in section 2.5, the following are used with a heavy
oil fired burner.
Low Oil Temperature Switch Thermostatic switch that prevents burner from starting, or stops
burner firing if fuel oil temperature is lower than required for oil
burner operation.
Oil Supply Pressure Gauge Indicates fuel oil pressure in the oil heater and supply pressure to
the fuel oil controller’s pressure regulator.
Component Description
High Oil Temperature Switch (optional) Switch contacts open when fuel oil temperature raises above a
selected temperature. Switch will interrupt the limit circuit in the
event fuel oil temperature rises above the selected point.
Hot Water Oil Heater Thermostat Used on a hot water boiler to sense fuel oil temperature and control
the starting and stopping of the booster water pump.
Booster Water Pump Started and stopped by the hot water thermostat to regulate the
flow of hot water through the hot water oil heater to maintain tem-
perature of fuel oil.
Fuel Oil Thermometer Indicates temperature of fuel oil being supplied to the fuel oil con-
troller.
Back Pressure Valve For adjustment of oil pressure on the downstream side of the
metering valve. Also regulates rate and return oil flow.
Oil Return Pressure Gauge Indicates oil pressure on the return side of the fuel oil controller.
Component Description
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