Modine Manufacturing POR Installation And Service Manual page 19

service & trouBlesHooting
oil Burner assembly (continued)
Problem B. Burner motor operates but no oil delivered at nozzle.
1. Oil level below intake line inside supply tank.
2. Clogged strainer.
3. Clogged nozzle.
4. Air leak in the intake line.
5. Restricted intake lines (high vacuum).
6. A two pipe system that becomes air bound.
7. A single pipe system that becomes air bound.
8. Slipping or broken coupling.
9. Frozen fuel unit shaft.
10. Excessive vacuum.
11. Dirty oil filter cartridge.
Problem c. Burner motor operates, delivers oil, but no flame.
1. No spark.
2. Poor atomization of oil.
3. Improper electrode setting.
4. Excessive combustion air.
Problem d. Burner starts but flame blows away from nozzle.
1. Excessive combustion air.
2. Excessive draft.
3. Poor atomization of oil.
4. Uneven flame.
Burner fuel unit
Problem a. no oil flow at nozzle.
1. Oil level below intake line in supply tank.
2. Clogged strainer or filter.
3. Clogged nozzle.
4. Air leak in intake line.
5. Restricted intake line (high vacuum reading).
6. A two-pipe system that becomes air bound.
7. A single-pipe system that becomes air bound.
8. Slipping or broken coupling.
9. Rotation of motor and fuel unit is not the same
as indicated by arrow on pad at top of unit.
10. Frozen fuel unit shaft.
Problem B. oil leak.
1. Loose plugs or fittings.
2. Leak at pressure adj. screw or nozzle plug.
3. Blown seal (single-pipe system).
4. Blown seal (two-pipe system).
5. Seal leaking.
6. Cover loose.
Problem c. noisy operation.
1. Bad coupling alignment.
2. Air in inlet line.
3. Tank hum on two-pipe system and inside tank.
Problem d. Pulsating pressure.
1. Partially clogged strainer or filter.
2. Air leak in intake line.
3. Air leaking around cover.
4. High vacuum. Should not exceed 17 inches
Hg (mercury).
Problem e. low oil pressure.
1. Defective gauge.
Problem f. improper nozzle cut-off.
1. Filter leaks.
2. Strainer cover loose.
3. Air pocket cut-off valve and nozzle.
4. Air leak in intake line.
5. Partially clogged nozzle strainer.
6. Leak at nozzle adaptor.
1. Fill tank with oil and bleed air from the line.
2. Remove and clean strainer.
3. Remove and clean or replace nozzle.
4. Tighten all fittings in the intake line. Tighten unused intake port plug in the fuel unit. If there are valves in
the line, be sure the valve stems are packed solid and tightened securely.
5. Replace any kinked tubing and check all valves in the intake line.
6. Insert by-pass plug if not in place. Prime pump.
7. See start-up procedure.
8. Tighten or replace coupling.
9. Return unit to factory.
10. Use next larger tubing size. Too high of a lift. Also see B5.
11. Replace cartridge.
1. Check the ignitor and high tension insulators.
2. Adjust oil pressure to 130 +/- 2psi for POR100 and 145, 100 +/- 2psi for POR 185, check for oil line
restriction and nozzle defects.
3. Remove firing assembly and adjust.
4. See start-up procedure.
1. See start-up procedure.
2. Adjust draft regulator.
3. Change nozzle with same capacity.
4. Change nozzle with same capacity.
1. Fill tank with oil. (Bleed air from oil lines.)
2. Remove and clean strainer. Replace filter element.
3. Replace nozzle.
4. Tighten all fittings in intake line. Tighten unused intake port plug. Check filter cover and gasket.
5. Replace any kinked tubing and check any valves in intake line. Check for correct line sizes.
6. Check for and insert by-pass plug. Make sure return line is below oil level in tank.
7. Loosen gauge port plug or easy flow valve and bleed oil for 15 seconds after foam is gone in bleed
hose. Check intake line fittings for tightness. Check all pump plugs for tightness.
8. Tighten or replace coupling.
9. Install fuel unit with correct rotation.
10. Return unit to approved service station or factory for repair. Check for water and dirt in tank.
1. Dope with good quality oil-resistant thread sealer. Retighten.
2. Washer may be damaged. Replace washer or O-ring.
3. Check if by-pass plug has been left in unit. Replace fuel unit.
4. Check for kinked tubing or other obstructions in return line. Replace fuel unit.
5. Replace fuel unit.
6. Tighten cover screws or replace damaged gasket.
1. Loosen fuel unit mounting screws slightly and shift unit in different positions until noise is eliminated.
Retighten mounting screws.
2. Check all connections. Use only good flare fittings.
3. Install hum eliminator in return line.
1. Remove and clean strainer. Replace filter element.
2. Tighten all fittings.
3. Be sure strainer cover screws are tightened securely. Check for damaged cover gasket.
4. Closed shut-off valve, clogged filter, kinked tubing, too small on line.
1. Check gauge against master gauge, or other gauge.
1. Check face of cover and gasket for damage.
2. Tighten screws on cover.
3. Run burner, stopping and starting unit, until smoke and after-fire disappears.
4. Tighten intake fittings. Tighten unused intake port and return plug.
5. Clean strainer or change nozzle.
6. Change nozzle and adaptor.
4-522.4
remedy
remedy
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