Source

Power

Source

Poor Fire

Flame Detector

Oil Supply

Procedure

If voltage fluctuates, fault is in the power source. Recheck voltage at the power source.

Procedure

After burner fires,

immediately jumper across flame detector

terminals at the primary control.

If burner continues to run (does not lock out of safety), fault may be poor fire. Inspect fire.

If fire is good, check for fault in flame detector

circuit.

If burner loses flame (does not lock out on safety), fault is in the fuel system.

Listen for pump whine

Causes

Loose wiring connection

Low or fluctuating line voltage

Causes

Unbalanced fire

Too much air - - lean short fire

Too little air - - long dirty fire

Excessive draft

Too little draft or restriction

Dirty CAD cell face

Faulty CAD cell - - exceeds 15000 hms

Loose or defective cad cell wires

Pump loses prime - air slug

Pump loses prime - air leak in supply line

Water slug in line

Partially plugged nozzle or nozzle strainer

Restriction in oil line

Plugged fuel pump strainer

Cold oil - outdoor tank

Correction

Locate and secure connection.

Call power company.

Correction

Replace nozzle

Reduce combustion air - check combustion.

Increase combustion air - check combustion.

Adjust barometric damper for correct draft.

Correct draft or remove restriction.

Clean CAD cell face.

Replace CAD cell.

Secure connections or replace cad cell holder and wire leads.

Prime pump at bleed port

Check supply line for loose connections and tighten fittings.

Check oil tank for water (over 1 inch) pump or drain out water.

Replace nozzle.

Clear restriction.

Clean strainer or replace pump.

Change to number 1 oil.

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505082M 10_5

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Image 22
Lennox International Inc O23V4-105, O23V5-140, O23V5-154, O23V-70 Power, After burner fires, Locate and secure connection

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