Looking for help with efm 520 timer not turning on boiler.

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nepacoal
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Posts: 1733
Joined: Wed. Nov. 21, 2012 7:49 am
Stoker Coal Boiler: Keystoker KAA-4 / "Kelly" and an EFM 520 at my in-laws
Hand Fed Coal Boiler: Harman SF-260 - retired
Coal Size/Type: Buck
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Post by nepacoal »

A 10° differential is good. LL at 180° and HL at 200° is fine. On a Honeywell aquastat, always keep at least 20° between the LL and HL to prevent circulator lockout. On Hydrolevels you can set them 10° apart, but I'd just stick with 20° apart for safety.

You could lower your LL to save a little coal during normal weather and raise up to 180° during those polar vortex events.

Walt Drake
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Posts: 10
Joined: Sat. Sep. 23, 2023 4:36 pm
Stoker Coal Boiler: Efm 520
Coal Size/Type: Rice
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Post by Walt Drake »

Thank you again for all your help I really appreciate it, take care.


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nepacoal
Member
Posts: 1733
Joined: Wed. Nov. 21, 2012 7:49 am
Stoker Coal Boiler: Keystoker KAA-4 / "Kelly" and an EFM 520 at my in-laws
Hand Fed Coal Boiler: Harman SF-260 - retired
Coal Size/Type: Buck
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Post by nepacoal »

Good luck! Hopefully you'll have another 15 years of trouble free service...

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davidmcbeth3
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Posts: 8458
Joined: Sun. Jun. 14, 2009 2:31 pm
Coal Size/Type: nut/pea/anthra
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Post by davidmcbeth3 »

273.JPG

273.JPG

Another success story .. nice

100% surer my advice was totally worthless on this one. :D

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