Adjustment Procedures
5-22
750-96 (revised 2010)
Model CB Packaged Boiler Manual
5.15 — Low Oil Temperature Switch
This control prevents the burner from starting, or stops it operation, if the temperature of the oil is below normal
operating temperature.
To adjust the control on a No. 6 oil fired steam boiler, 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.
Turn the differential adjusting screw (located above the dial) until the movable indicator is approximately 5º F
above the setting on the main scale.
On a standardly equipped No. 5 oil burner, and on a No. 6 oil burner installed on a hot water boiler, the low oil tem-
perature switch is an integral part of the electric oil heater. The switch in this case is non-adjustable and is factory
set at approximately 40º F below the maximum operating temperature of the heater.
5.16 — High Oil Temperature Switch (Optional)
This control 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 normal operating temperature. These con-
trols generally have a set differential and will close 5º F below the set point.
5.17 — Low Oil Pressure Switch (Optional)
This control prevents burner ignition, or stops its operation, when the oil pressure is below a set point. 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.
5.18 — Electric Oil Heater Thermostat: Steam, Series 400, 600
The maximum temperature setting of the control is stamped on the dial. This 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 sufficiently lower temperature (approximately 15º) than the
steam heater thermostat. This eliminates the electric heater from 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.
A 0.005 MFD capacitor is wired in parallel with the thermostat lead connections to prevent contact bounce and
arcing. The control differential is non-adjustable.
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