EFM520 timer question
- 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 almost done wore this 520 in but hit a road block I have a Tork 1hr mechanical timer and have power to it now my question is where does it go from there to on my aquastat which is a L7224 I’m afraid of wiring it wrong and shorting something out
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- nepacoal
- Member
- Posts: 1696
- 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
See page 15. On a 520, the switched output from the timer goes to ZR. Using ZR will prevent the timer from firing the stoker above the high limit.
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- nepacoal
- Member
- Posts: 1696
- 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
In the manual above, it would be terminal 4.
1. 120v hot
2. 120v neutral
3. Jumpered to 1.
4. Normally open circuit that closes on timer cycle to pass voltage from 3. (Usually a red wire is used to ZR)
I don't know the terminal designations for the Tork
1. 120v hot
2. 120v neutral
3. Jumpered to 1.
4. Normally open circuit that closes on timer cycle to pass voltage from 3. (Usually a red wire is used to ZR)
I don't know the terminal designations for the Tork
- Rob R.
- Site Moderator
- Posts: 17980
- Joined: Fri. Dec. 28, 2007 4:26 pm
- Location: Chazy, NY
- Stoker Coal Boiler: EFM 520
- Hand Fed Coal Stove: Chubby Jr
Currently you have a jumper from power to the NO terminal. You should change that so the jumper goes from power to the C terminal, as shown in the attached diagram. Next connect a wire from the NO terminal in the timer to the ZR terminal in the aquastat (shown as Load 2 in the diagram).
The way you have it wired now would work, but it would be confusing to anyone trying to troubleshoot it later.
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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 guys so have my EFM 520 all wired and it runs but when not calling for heat the timer doesn’t work to keep fire going it have power to timer and timer does work don’t know if it wired right in aquastat right not it’s on Zr and Zc in aquastat any help would be great