Starting and Operating Instructions
4-8
750-96 (revised 2010)
Model CB Packaged Boiler Manual
4.7.3 — Oil Temperature
When oil flow is established and regulated, turn the oil heater switch to “on.”
The electric oil heater has a built-in adjustable thermostat. Turn the adjusting screw to maintain an oil temperature
of approximately 140º-150º F.
Close the manual bypass valve after temperature rise on the fuel oil controller thermometer is noted. Make certain
that hot oil is moving through the controller. The orifice gate valve must also be closed. If the temperature drops,
open the orifice gate valve until a rise is noted, then close it.
Final regulation of oil flow through the nozzle may be done later, if necessary, by adjusting the metering cam
screws as outlined in Chapter 5.
Suggested oil pressures at high fire operation:
4.7.4 — Starting
When all conditions covered above and in Sections 4.1, 4.2, 4.3, and 4.4 are assured, the burner is ready for fir-
ing. Refer to Section 4.10 for further starting and operation information.
4.8 — Firing Preparation for No. 6 Oil: Series 400-600
Prior to initial firing, oil flow, pressure, and temperature should be established and verified. Atomizing air pressure
should also be established as outlined in Section 4.4. The schematic flow diagram in Chapter 1 indicates the flow
of fuel and atomizing air.
If the boiler is a combination fuel model, make certain that the main gas shutoff cock is closed and set the gas/oil
selector switch to “oil.” Insert the burner drawer gun into its most forward position and latch it in place.
4.8.1 — Oil Flow
Open all valves in the oil suction and oil return lines. Open the bypass valve on the fuel oil controller until oil flow is
established. Normally, the orifice valve is left in a closed position. However, on cold starts, it may be opened for
Before turning on the oil heater switch, make certain that the heater shell is filled with fuel oil as indicated by a pres-
sure reading on the fuel oil pressure gauge.
NOTE: The temperatures listed are tentative. The composition of the fuel oil in a given grade can vary, necessitating a
higher or lower preheating temperature. The viscosity of the oil at the nozzle should be less than 300 SSU and prefer-
ably less than 150 SSU. The actual temperature of the oil at the burner should be determined by flame appearance
and good combustion based on a stack analysis. See Chapter 5 for additional information.
Oil Supply 75 psi minimum
Oil Burner Pressure 40-50 psi
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