Dunkirk EXCELSIOR EXB5115 Ek Talimatlar - Sayfa 15

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Beckett NX BURNER TROUBLESHOOTING

Condition 1: Burner motor does not start when there is a call for heat.

Procedure

1. Check that limit switches are closed and

contacts are clean.

2. Check for line voltage power at the oil

primary control. Voltage should be 120

Vac between the black and white lead

wires on the oil primary control.

3. Check indicator light with burner off, no

call for heat (no flame).

4. Shield cad cell from external light.

5. Verify that the oil valve is closed during

the "valve on delay" period by observ-

ing the view port and verifying that no

flame is present during the 15-second

"valve on delay".

6. Jumper thermostat (T -T) terminals on

Aquastat

IMPORTANT

First remove one thermostat lead wire.

OPERATION AND TROUBLESHOOTING

Status

Corrective Action

N/A

Green Indicator light

Cad cell is defective, sees external light, or connections have shorted. Go to step

is on.

Green Indicator light

Go to step 6.

is off.

Green Indicator light

Eliminate external light source or permanently shield cad cell.

turns off.

Replace cad cell with new cad cell and recheck.

If indicator light does not turn off, remove cad cell lead wires from Aquastat and

Green Indicator light

recheck.

stays on.

If indicator light is still on, replace the Aquastat control.

If the indicator light turns off, replace cad cell bracket assembly.

Green Indicator light

If flame is present, replace the oil valve.

is on.

Trouble is in thermostat circuit. Check thermostat-wiring connections.

Burner starts.

If connections are clean and tight, check thermostat wires for continuity.

•

Burner does not start.

•

If burner still doesn't start, check the oil burner motor. It may be seized or

burned out.

•

Disconnect line voltage power and open line switch.

•

Check all wiring connections.

Tighten any loose connections and recheck.

If burner still doesn't start, replace Aquastat.

N/A

P/N 240009355, Rev. C [11/15/2015]