EFM520 circulator question
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klim1972
- Member
- Posts: 74
- Joined: Tue. Nov. 01, 2011 11:15 am
- Location: lake ariel Pa
- Stoker Coal Boiler: EFM df 520
- Coal Size/Type: Buck
Ok so been running the new 520 for about 2 weeks and just noticed when thermostat calls for heat boiler turns on and runs instantly is this normal? I don’t remember my last boiler doing this till water temp was under temp? Or is something g wired wrong?
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Retro_Origin
- Member
- Posts: 926
- Joined: Sun. Feb. 21, 2021 7:46 pm
- Location: Schuylkill county
- Stoker Coal Boiler: 1957 Axeman Anderson 130
- Coal Size/Type: Buckwheat / Pea
It’s typical to setup them that way, the boiler is firing so it doesn’t fall behind during a heat call. This is especially important for slow ramp up fires like coal.
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nepacoal
- Member
- Posts: 1700
- 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
Yep, that's exactly how a triple aquastat works when the TT terminal is connected to a thermostat ( or end switch if using a Taco SR type control). A simple on off aquastat would work like your old one.
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nepacoal
- Member
- Posts: 1700
- 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
Yes... The majority of boilers use a triple aquastat. What's your high limit and low limit? A good starting point for an EFM is 200 HL, 160 LL with a differential of 10.
