750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
6-27
6.24 — Low Oil Temperature Switch
6.24 — Low Oil Temperature Switch
The LOTS prevents the burner from starting, or stops its operation, if the temperature of the oil is below normal
operating temperature.
To adjust the control:
1. Insert a screwdriver into the center slot in the control cover and turn the dial until the fixed (center) pointer is
approximately 30º F lower than the oil heater thermostat setting.
2. Turn the differential adjusting screw (located above dial) until the movable indicator is approximately 5º F above
the setting on the main scale.
On a hot water boiler, the low oil temperature switch is an integral part of the electric oil heater. The switch is non-
adjustable and is factory set at approximately 40º F below the maximum operating temperature of the heater.
6.25 — High Oil Temperature Switch (Optional)
The HOTS prevents the burner from starting, or stops its operation, if the temperature of the oil exceeds the nor-
mal operating temperature.
To adjust, turn the dial until the pointer is approximately 25º F above the normal operating temperature. The con-
trols generally have a set differential and will close 5º F below the setpoint.
6.26 — Low Oil Pressure Switch (Optional)
The LOPS prevents burner ignition, or stops its operation, when the oil pressure is below the setpoint. Adjust the
control by turning the screw on top of the control case to an indicated pressure 10 psi below the established pri-
mary oil pressure setting indicated on the oil supply pressure gauge. The switch will remain in a closed position as
long as the oil pressure exceeds this setting. The control normally used automatically resets when pressure is
restored after a drop.
6.27 — Electric Oil Heater Thermostat (400 and 600 Series: Steam)
The maximum temperature setting of the control is stamped on the dial. The maximum temperature setting is
attained with the adjusting knob turned to the “high” end of the scale. Lower settings are obtained by turning the
adjusting knob clockwise using the thermometer in the fuel oil controller as a guide.
The final setting of this thermostat should be at a temperature approximately 15º F lower than the steam heater
thermostat. This eliminates the electric heater operation when the steam heater is functioning. The electric heater is
sized to provide sufficient heated oil for low-fire operation on cold starts before steam is available.
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