Condition: Burner starts then locks out on safety with indicator light flashing at 1/2 second on, 1/2 second off. (Cont.)

Procedure

Status

Corrective Action

 

Ignition is off

Spark igniter could be defective. Check for line voltage at igniter

 

terminals. If line voltage is present, replace R7484.

 

 

8. Listen for spark after burner

Ignition is on.

Go to Step 9.

turns on (after 2 second delay).

 

 

Ignition is on but no oil is being

Wait for “Valve ON” delay to complete. Check oil supply, and oil line

 

 

sprayed into the combustion

 

valve. Check for filter blockage or seized oil pump.

 

chamber.

 

 

 

 

 

9. Check indicator light after flame

Indicator light is on until the

Replace R7184

control locks out and starts

is established, but before oil

flashing during lockout.

 

primary control locks out.

 

 

Indicator light stays off.

Go to step 10.

 

10.Check cad cell sighting for view of flame.

a.

Disconnect line voltage power

Burner locks out.

Go to step 11.

 

and open line switch.

 

 

b.

Unplug cad cell and clean cad

 

 

 

cell face with soft clothe.

 

 

 

 

 

 

Check sighting for clear view

 

 

 

of flame. Replace cad cell in

 

 

 

socket.

Burner keeps running.

System is OK.

c.

Reconnect line voltage power

 

 

 

and close line switch.

 

 

d.Start burner.

11.Check cad cell.

a.Disconnect line voltage power

and open line switch.

Indicator light is on.

Remount control onto burner housing. Go to step 6.

b.Remove existing cad cell and replace with new cad cell.

c.Disconnect all wires from thermostat terminals to ensure that there is no call for heat.

d.

Reconnect line voltage power

Indicator light is off.

Go to step 12.

 

and close line switch.

 

 

e.

Expose new cad cell to bright

 

 

 

light such as a flashlight.

 

 

12. Check cad cell bracket

 

 

 

assembly.

 

 

a.

Disconnect line voltage power

Indicator light is on.

Replace cad cell bracket assembly.

 

and open line switch.

 

 

b.

Remove cad cell wires from

 

 

 

quick connect connectors on

 

 

 

 

 

 

the R7184 and leave control

 

 

 

lead wires open.

 

 

c.

Apply power to device.

Indicator light is off.

Replace R7184.

d.

Place jumper across cad cell

 

 

 

terminals after burner motor

 

 

 

turns on.

 

 

NOTE: Restricted Mode - (Limited Reset): In order to limit the accumulation of unburned oil in the combustion chamber, the control can be reset only 3 times, after which, the control locks out. The reset count returns to zero each time a call for heat is successfully completed.

To reset from RESTRICTED MODE: press and hold the reset button for 30 seconds. When the LED flashes twice, the device has reset.

NOTE: Disable function: Pressing and holding the reset button will disable all functions until the button is released. The burner will restart at the beginning of the normal heat cycle on SAFETY CHECK.

28

30318 R4 9/9/2005

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Image 28
Field Controls WML-C, MPL-B manual Remount control onto burner housing. Go to step

MPL-B, WML-C specifications

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