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Buderus 2017 on a gas boiler, term 12 needed?

GW
Member Posts: 4,593
Does anyone have an idea why the wiring directions show both line voltage and a switched leg going through the 2107? I have a guy calling us where the 12 term died. I fed the Honeywell with live power. The 10-11 are still switching the HW on and off heat call. I couldn't seem to get an answer for the Bud. Thanks, Gary
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Comments
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Terminal 12 is the manual reset high limit. The high voltage terminal (L1) of the aquastat must be fed from that.
Oil burners – factory jumper between terminals 12 & 10, brings 120V from 12 to 10. When contacts close between terminals 10 & 11, 120V power is sent from terminal 11 to Hot on the burner (terminal 4 is the neutral).
Gas burners – remove factory installed jumper between terminals 10 & 12. The contacts between terminals 10 & 11 are now “dry” (no voltage present) and switching to the burner is now low voltage between terminals 10 & 11 on the R2107 and TT (or RW) on the boiler aquastat.
Bob Boan
Bob BoanBob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
Thanks Bob, the HW is the main boiler control, the 2107 is acting as a fuel savings device. I can see the point when the boiler control is removed (on an oil boiler). I'm simply trying to justify 'insisting' the home owner 'must' have a new 2107 installed.0
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Gary,
The manual reset is under the black cap to the left of the temp dial.
There's also a fuse under the small cap to the right of the display.Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0
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