750-96 (revised 2010)
Model CB Packaged Boiler Manual
4-9
4.8 — Firing Preparation for No. 6 Oil: Series 400-600
brief periods to aid in establishing oil flow. The bypass and orifice valves must be returned to the closed position
as soon as proper oil flow is established as indicated by a reading on the oil supply pressure gauge. Do not
attempt to set pressures while valves are open.
Momentarily energize the fuel oil pump starter to check for proper pump rotation. With the rotation verified, prime
the suction line strainer with oil and start the fuel oil pump by closing its power entrance switch. Observe the oil
supply pressure gauge for indication that oil flow is established. If no pressure shows on the gauge after a few
moments, stop the oil pump and re-prime. Heavy oil in the storage tank must be at a temperature to provide oil vis-
cosity to permit flow through the oil pump and suction line. If oil flow is not established after priming the pump on
one or more occasions, conditions preventing oil flow must be determined and corrected to avoid damage to the
pump’s internal mechanism.
A vacuum (or a compound pressure-vacuum) gauge should be installed in the oil suction line and its reading
observed and recorded for future guidance. This gauge reveals the tightness of the system.
4.8.2 — Oil Pressure
Oil pressure is regulated in several areas. The first is at the relief valve at the oil heater. This should be set so that
at maximum firing rate a minimum reading of 75 psi is obtained on the oil supply pressure gauge.
The other pressure adjustments are to the regulators on the fuel oil controller. Adjust the fuel oil pressure regulator
so that the burner oil gauge registers approximately 45 psi. Adjust the back pressure relief valve so that its gauge
reads approximately 10 psi less than the burner gauge.
After the burner is firing, further adjustments can be made, if necessary, to these valves.
The pressure gauges will indicate lower readings when main flame is ignited. The pressure will decrease as the fir-
ing rate increases and vice versa. The pressure reading on the two gauges on the controller will, despite this fluc-
tuation, retain a nearly constant difference of 10 psi.
Final regulation of oil flow to the nozzle can be done, if necessary, by adjusting the metering cam screws as out-
lined in Chapter 5.
Suggested oil pressures at high fire operation:
4.8.3 — Oil Temperature
After determining that the heater shell is filled and that fuel oil circulation exists, turn the oil heater switch to
“on.” Adjust the electric oil heater thermostat to maintain oil temperature at approximately 200º F.
Oil Supply Pressure Gauge 75 psi minimum at maxi-
mum firing rate
Oil Burner Pressure Gauge 40-50 psi
Oil Return Pressure Gauge 10 psi less than oil supply
pressure
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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