Startup and Operation
4-8
750-392
CBEX-DE
FIGURE 4-1. Oil gauge glass
To verify air flow and pressure, place the burner run/test switch on the flame safeguard 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 the 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 (remember, air pump rotation is clockwise), 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.
The air pressure will increase when an oil flow exists. At low firing rate, the air pressure may rise to 12 psi or
more.
After air flow has been verified, turn the burner switch off and return the run/test switch to the “run” position.
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.
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.
!
Caution
To Next Page
Loading...
Need help?
General
