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6.0 Trouble-Shooting
CAUTION
PROBLEM
Pilot fails to light.
Main flame fails to light
or goes out as burner
cycles to high fire.
Smoke on high fire.
Smoke on low fire.
Burner rumbles or bangs.
Trouble shooting of panels and electrical circuits should be done by
qualified plant electricians, technicians, or engineers experienced in
all facets of this type of combustion equipment.
CAUSE(S)
1. On initial start-up, gas line may be filled with air. Repeat ignition trial sev-
eral times to purge.
2. No power to ignition transformer or pilot solenoid.
3. Open circuit between ignition transformer and spark plug.
4. Spark plug needs cleaning. See "Maintenance" section for instructions.
5. Spark plug improperly grounded. Do not use pipe dope on ignition plug
threads.
6. Pilot gas cock screw closed.
7. Insufficient gas pressure into or out of pilot regulator.
1. Pilot set too lean, becoming unstable as air increases.
2. Insufficient pressure into or out of main gas regulator.
3. Main gas adjusting valve not open enough.
1. Gas flow is rich. Main gas butterfly valve is open too far.
1. Gas flow is rich. Proportionator spring is screwed out too far.
2. Insuffiicient air flow due to dirty blower filter or impeller.
3. Air butterfly valve is closed too far.
4. Insufficient gas pressure into proportionator, causing it to track improperly
at all rates below high fire. Raise inlet gas pressure as listed in Section 2.
1. Burner not properly set. See Section 5.0.
2. If rumbling occurs, slide a piece of steel plate over the end of the tube until
the noise disappears. Then weld the plate in place.
8
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