Running a Stoker in tandem with an oil boiler

I have just purchased a efm df520. I would like to run it in tandem with my existing oil boiler.
I want to keep the existing t-stats, zone valves, circulator, etc.
I will bring hot water from the df520 to the existing boiler. (not going to use the domestic hot water coil)
I am looking for a control schematic for this arrangement.
The oil boiler has a L8148a aquastat. high limit burner cutout.
The df520 will have a L8124a Triple acting aquastat. plus a will burt timer 20350.
am i right in thinking i can set the oil boiler high limit stat to 140
and the stoker stat to 200 high and 160 low?
or am i over simplifying it?
what i am trying to accomplish is having the stoker as the primary heat source and the oil as a back up if i have a out fire or if i have to leave for a few days

thank in advance for any help.
steve

I just run a circulator 24/7 from the coal boiler to the oil boiler. No fancy controls. I disconnect a wire from the oil boilers burner so that it cannot fire. After 9 years of using this coal boiler out fires are scarcer than hens teeth. Besides, doesn't a df520 have an oil burner also?

coalkirk wrote: Besides, doesn't a df520 have an oil burner also?

Only if you get the oil package...which I would not recommend if there is an existing oil boiler in the house.

Steve, I have an EFM 520 and oil boiler in my house as well. My first winter I did exactly what you suggested and turned down the aquastat on the oil boiler...it didn't have to run once that winter. The next winter I just shut the switch off to the oil burner and connected the thermostat wire from the zone control box to the L8124 on the EFM...that way when a zone calls for heat, the EFM stoker and circulator between the boilers starts. This is my third winter with the EFM, and I have still not had to bring the oil boiler online for heat. No outfires, no problems.

hi there, i have an axeman 130 that i ran in tandem with the oil burner, i turned off the oil burnerwith a switch, for heat i disconnected the circulator from the oil burner and wired it to the 130 same with the zone valves,hooked everything up on the 130 just as t was on the oil burner, now if i need hot water out of the oil burner i just flip the switch, for heat out of the oil burner,i have to hook up the wires to circulator and zone valves, 5 mins and im on oil again, i have been runnin for a year now and i have not had to turn the oil burner on , when i go away i have my neighbor check the boiler when he comes over to let the pets out, take care T.

I replaced my wood boil to coal that is connect to oil boiler. What I did in the past was reset high 120 low 100 on oil for back up, furnace came on if I forgot to load wood. Going to be first year with coal so going to keep same set up, reason is I'm not using glycol. Once I get familiar with keystoker my set up maybe tweak.