Hydrostat 3250+ Failure
- nepacoal
- Member
- Posts: 1701
- Joined: Wed. Nov. 21, 2012 7:49 am
- Location: Coal Country
- 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
I just noticed that I've been using the inexpensive Chinese timer for two years now... 2 years and just over a week to be exact. Still going strong with zero issues... Second best Mod made to my system!
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- Rob R.
- Site Moderator
- Posts: 18009
- Joined: Fri. Dec. 28, 2007 4:26 pm
- Location: Chazy, NY
- Stoker Coal Boiler: EFM 520
- Hand Fed Coal Stove: Chubby Jr
Yeah this is a 60 minute model. I already threw the clock in the dumpster. I kept the enclosure and will get some DIN rail and mount one of the solid state units inside it.
- DCCoalBurner
- New Member
- Posts: 8
- Joined: Thu. Oct. 29, 2015 1:30 am
- Location: Dickerson, Maryland
- Stoker Coal Boiler: EFM520
- Coal Size/Type: Rice
- Other Heating: Backup Oil Burner
Don't mean to raise an old thread but I'm glad I found this. I had two Hydrostat 3250 fail on my EFM 520 in 7 years. Last one only lasted 2 years. Both failures left the boiler stuck running. I'm not going try a third.
- Rob R.
- Site Moderator
- Posts: 18009
- Joined: Fri. Dec. 28, 2007 4:26 pm
- Location: Chazy, NY
- Stoker Coal Boiler: EFM 520
- Hand Fed Coal Stove: Chubby Jr
Same thing happened to mine, and I will save Leon the trouble of retyping what happened to his: Post by lzaharis - 2023 AA260 InstallDCCoalBurner wrote: ↑Sat. Sep. 30, 2023 1:26 amDon't mean to raise an old thread but I'm glad I found this. I had two Hydrostat 3250 fail on my EFM 520 in 7 years. Last one only lasted 2 years. Both failures left the boiler stuck running. I'm not going try a third.
I have been told that the Hydrostat controls do fine if you move the stoker motor load to an external relay. I am doing this on the AA260 I am working on and will see how it goes. Regardless of your choice of primary aquastat, you should have a second high limit control. Ideally it would be a manual reset type (see link below), but even a regular L4006A is better than nothing.
https://www.supplyhouse.com/Resideo-L4006E1000-Hi ... ating-Temp