Chapter 5 — Starting and Operating Instructions
Part No. 750-184 5-5
Check the oil level of the air intake strainer. When operating a
standard CB boiler, make certain that the V-belt which drives the air
pump is in place and has proper tension.
To verify air flow and pressure, place the burner Run/test Switch on
the program relay to the test position. If the burner is a combination
fuel burner, be sure that the gas/oil selector switch is set to “oil.”
Turn t h e Burner Switch on. The burner will cycle to the low fire pre-
purge position and stop there.
Observe the reading on the air pressure gauge. With no oil flow, the
pressure should be a minimum of 7 psi.
If there is no pressure, determine the cause and correct it before
proceeding. Check for obstructions in the air inlet line, incorrect
rotation, or a loose oil nozzle or other leaks. If the pressure is much
higher without any oil flow, check for obstruction in the discharge
line or at the oil nozzle. If there is no obstruction, restrict the air flow
by adjusting the air intake valve screw.
The air pressure will increase when an oil flow exists. At low firing
rate, the air pressure may rise to 12 psi or more.
Note: The air pressure should not exceed 35 psi at high fire. Greater
air pressure causes excessive wear of the air pump, increases
lube oil usage, and can overload the motor, thus causing
damage to the equipment.
Note: Abnormally high pressure indicated on the nozzle air pressure
gauge is an indication that the burner nozzle has become
clogged. In the event of clogging, check the nozzle and clean
as necessary.
After air flow has been verified, turn the burner switch off and return
the run/test switch to the run position.
E. FIRING PREPARATIONS FOR NO. 2 OIL (SERIES
100-200)
Prior to initial firing, oil flow and pressure should be established and
verified. Atomizing air pressure should also be established as
outlined in Section D.
See section H for IFGR setting procedures.
If the burner is a combination fuel model, be 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.
Oil Flow - Open all valves in the oil suction and oil return lines.
If the oil supply tank is located above the level of the pump and flow
to the pump is by gravity, then it will usually be necessary to vent
the suction line to allow oil to fill the line. Venting the suction line
can generally be accomplished by cracking a union fitting, or by
opening the cap of the oil strainer using care to prevent spillage of
oil. Tighten the fitting or the cap as soon as oil flow appears.
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