Update:
I had originally done the Beckett Mod to the Andy & Jean Harmon, Wander Lodge groups wiring diagram. Along with Richard's idea of adding a main power relay and 14 ga wire. The drawback to that method was you were interrupting the main power to the Beckett controller. This caused an immediate shutdown of the burner and fan motor i.e. no purge cycle. The Beckett controller manual identifies this condition. This is in fact what was going on for the last year or so. This also causes unburned fuel in the nozzle to carbonize, due to the heat and disturbed the spray pattern. My nozzle only lasted about a year before I had burner issues (smelling unburned fuel inside the coach). I had also provisioned the Beckett igniter but not used it at the time.
Fast forward to now. My OCD got the best of me to find a fix for the "non purge condition". Richard checked his operating Beckett Mod and does have the 2 min purge cycle upon shutdown. Eureka moment, the Beckett does have an internal purge cycle as long as you don't switch off the main power (page 5 Beckett 7556 manual). I borrowed Richard's Beckett Contractor Tool (displays the internal programing and fault codes) to verify my settings. They were set to a 15 second pre purge and a 2 min post purge. Understanding that main power interruption was by passing these parameters there had to be a way to enable this on my set up.
As it turned out the solution was pretty simple (see the attached wiring diagram). By connecting a direct 12vdc main power to the Beckett. Then using the main power relay to make and break the Beckett "Enable" circuit. Now the Beckett controller is in standby mode at all times waiting on a call for heat. Once the switch is turned on and the 190 degree T-stat is closed the unit fires right up. While the burner is operating, turning the switch off I now have the two min post purge cycle.
While working on this I completed the install of the Beckett Igniter box. Richard asked to verify the alarm circuit by disconnecting the igniter and attempt a start. Blower came on 15 sec later heard a relay click obviously the burner did not light. 15 sec later the blower shut down and the AH light went out.....that worked properly. To reset the controller one must interrupt the main power for 10 sec....i installed a bullet connector in the main power circuit to facility a controller reset.
As you can see the final configuration has enough wire that I am able to remove the two bolts holding the white board and lay it off to the side on top of the AH in order to gain access to the burner assembly.
Attached is the final wiring diagram configuration I used....if anyone sees an error please let me know. I used this free online diagram editor (
https://www.circuit-diagram.org) to draw this up. Also, some other attachments that you may find helpful.
Many thanks to Andy & Jean Harmon and Richard for the insperation and help with this project!!
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