Riello G5X Burner and 530SE Control Box

[John Carroll]

Friend had a few problems with the above not firing up so I took a few readings off my own nearly 20 year old Firebird with the same burner and control box.

The oil solenoid coil is a 3 wire with two windings, one is 1.4 ohm (start up), the other is 1400 ohms (holding). What is supposed to happen is, 12 secs after the prepurge, both windings get 30VDC, after the 30V drops off the start up winding and 3V is supplied to the holding winding and the 30V is removed.

But, on mine, 30V (actually 27V) is supplied to both windings from the runup start. After ~ 17 secs the 27V is removed from the holding winding, leaving 3V (actually 4.5V), but I still measure 27VDC on the start up (1.4 ohm) winding which apparently remains there while the burner is firing. If so then one would expect the coil to burn out very rapidly?. I also removed the burner from the boiler and placed it on the ground and started/stopped it 4 times after 9 secs but before ignition point so ~ 36secs but couldn't see any signs of oil dribble which would surely be apparent if the oil valve was energised at the start of runup. There is normally ~ 5bar pressure on runup & before the oil valve is energized CLOSED , the oil pressure then builds up to ist's normal 8bar and fires the burner.

Any thoughts on this?.

 

 

 

 

 

 

Edited January 1 by John Carroll