Weil-McLain QB-180 Manual page 13

QB-180/300 Oil Burners Series 2 — Burner Manual
If burner starts and
has a smoky flame
If you hear
mechanical noise
from the burner
If you hear
combustion noise
If there is puffback
from burner
If there is nozzle
drip
Part number 644-500-065/0200
Check for:
Insufficient combustion air
Improper mixing of oil and air
Insufficient draft
Check for: Loose fan
Air in oil line
Defective pump gears
Obstructed suction line
Check for:
Insufficient draft in breeching
or overfire
Improper mixing of oil and air
Incorrect attenuating air band
setting
Check for:
Delayed ignition
Nozzle afterdrip due to poor
cutoff
Check for:
Air in supply line from oil tank
to fuel pump
High vacuum
Flame impingement on target
wall or crown sheet of boiler
Nozzle afterdrip due to faulty
solenoid or cutoff valve
Defective motor bearings
Pump and motor shaft mis-
aligned
Defective ignitor
Defective primary control
Incorrect adjustment cam set-
ting
Loose or dirty fan
Excessive draft
Incorrect attenuating air band
setting
Hot nozzle or gun assembly due
to improper draft, misadjusted
burner or blocked flueways in
boiler
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