Running a Stoker in Tandem With an Oil Boiler

Running a Stoker in tandem with an oil boiler

PostBy: spc450 On: Sat Sep 22, 2012 12:52 am

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.
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Other Heating: Oil Boiler
Stove/Furnace Make: EFM
Stove/Furnace Model: DF520

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Re: Running a Stoker in tandem with an oil boiler

PostBy: coalkirk On: Sat Sep 22, 2012 5:48 am

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?
Stoker Coal Boiler: 1981 EFM DF520
Coal Size/Type: anthracite/rice coal

Re: Running a Stoker in tandem with an oil boiler

PostBy: Rob R. On: Sat Sep 22, 2012 5:59 am

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 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.
Rob R.
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Running a Stoker in tandem with an oil boiler

PostBy: Fran654 On: Sat Sep 22, 2012 6:55 am

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.
Stove/Furnace Make: US Stove
Stove/Furnace Model: 6100M

Re: Running a Stoker in tandem with an oil boiler

PostBy: Wiz On: Sat Sep 22, 2012 8:08 am

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. :oops: 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.
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

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