Lennox O23Q2-70, Руководство по установке

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Page 20
Troubleshooting: Burner starts, but no flame is established.
Source Procedure Causes Correction
Oil Supply
Check tank gauge or use dip
stick.
No oil in tank Fill tank.
Coat dip stick with litmus paste
and insert into bottom of tank.
Water in oil tank
If water depth exceeds 1 inch,
pump or drain water.
Listen for pump whine. Tank shut−off valve closed Open valve.
Oil Filters & Oil Line
Listen for pump whine.
Oil line filter is plugged Replace filter cartridges.
Kinks or restriction in oil line Repair or replace oil line.
Plugged fuel pump strainer Clean strainer or replace pump.
Open bleed valve or gauge port.
Start the burner. No oil or milky
oil indicates loss or prime.
Air leak in oil supply line
Locate and correct leak.
Tighten all connections.
Oil Pump
Install pressure gauge on pump
and read pressure. Should not
be less than 140 psi.
Pump is partially or completely
frozen. No pressure and the
motor locks out on overload.
Replace pump.
Coupling disengaged or broken
− no pressure
Re−engage or replace coupling.
Fuel pressure too low Adjust to 100 psi.
Nozzle
Disconnect ignition leads. Ob-
serve the oil spray (gun assem-
bly must be removed from unit).
Inspect the nozzle for plugged
orifice or carbon build−up around
orifice.
Nozzle orifice plugged
Replace nozzle with the same
size, spray angle, and spray
type.
Nozzle strainer plugged
Poor or off center spray
Ignition Electrodes
Remove gun assembly and in-
spect electrodes and leads.
Fouled or shorted electrodes
Clean electrode leads.
Dirty electrodes and leads
Eroded electrode tips
Clean electrode tips and reset
the gap to 5/32 inches and cor-
rectly position tips.
Improper electrode gap spacing
Improper position of electrode
tips
Bad buss bar connection Retension and realign.
Cracked or chipped insulators Replace electrode.
Cracked or burned lead insula-
tors
Replace electrode leads.
Ignition
Transformer
Connect ignition leads to the
transformer. Start burner and
observe spark. Check line volt-
age to transformer primary.
Low line voltage
Check voltage at power source.
Correct cause of voltage drop
or call the power company.
Burned out transformer wind-
ings.
Replace the transformer.
No spark or weak spark
Properly ground the transformer
case.
Burner Motor
Motor does not come up to
speed and trips out on overload.
Turn off power and rotate blower
wheel by hand to check for bind-
ing or excessive drag.
Low line voltage
Check voltage at power source.
Correct cause of voltage drop
or the call power company.
Pump or blower overloading
motor
Correct cause of overloading.
Faulty motor Replace motor.