Logmatic Problem

Mellow_2

The 2109 has no program and no room sensor. If this is the 2109 control I would look at the lwco and burner circut. The other circuts sound OK. Hard to know without knowing what #s everything is hooked to. When you turn off the hot water in the "program" you must be working on a 2107. I have to jump the hot water sensor on the 2109 to turn off the hot water but the 2107 can turn off in the program.

The question is why the do the lights go on and off? This cannot be a dead short or the fuse would blow so maybe some voltage is getting back to the control? Dose this happen all the time? What can you run without this problem?

Big Ed

Logmatic Problem

Just started up Buderus system with Logmatic control . Ajusted the program , unit ran up to temperature then burner stopped. The screen flashes showing everything lights and all. Switched to manual and screen still flashes but burner runs...... Checked connections , every thing looks alright ??? The only thing I could add is I ran the boiler up through the pump station only. Any ideas ??? Is it me or the control ???

Mellow_2

wiring

how was the control wired? Maybe a wire on the wrong terminal or what type off burner is it? Dose it have the new honeywell control R784U? The burner might be feeding power back to the 2107 control. I just had to wire one of the honeywell controls to a 2109 and had to use T+T on the honeywell and run to 10+11 on the green burner plug on the 2109. When the burner reached the adj. limit it would click on and off very fast. I was getting power back from the igniter circut on the burner control. Can you send more wiring info?

Steve Ebels_3

???

"Ran the boiler up through the pump station"

I'm not following what you mean by that. Is the control powered up by some other device?

Check polarity.

Big Ed

Set up

Equitment is the G115/21 ,no indirect ,Buderus panals with trv thermostats home run piped,Buderus pump station non mix(used for the bypass in case all rads shut off.Used the bypass in pump station to check fire before radiation was fully hooked up.Buderus blue F3 Riello.lock out terminal and wire connected to L2109. No room sensor. Terminals on L2109 used........line in with ground/burner through lwco,jumper for run clock / heat pump terminals connected to pump station /the out door sensor/water production was shut off in program before problem..Thanks

Big Ed

L2107

Sorry I always had problems remembering control numbers

You know when the control first starts up , everthing shows on the screen and all three (sun,moon & auto)light shine, then it goes to a normal screen and unit starts to run. Well the control seems to start up then shut off before it runs the program. Nothing will turn on . It is running right now on manual with burner working off the manual limit and circulator running . The screen is doing the same on and off thing.

The control worked at first fire. Showed normal error on DHW sensor which I shut down along with the changes the Service book tells you to change, The outdoor sensor was working . I put the set back program to empty , the home owner wanted same temp day and night. The system did seem to flicker while running up to temperature. No radiation was hooked up just running through the supply -return loop. The burner shut off then fired back up again minutes later . Did not see screen flicker.

We buttoned up the boiler and finished radiation thats when problem showed up.....

I am trying to think of where a feed back could come from . LWCO is wired after Logomatic on its way down to burner. The center terminal on the Riello , lock out alarm running back to control needs another check , The circulator would work or not ?

Time to call Charles
,

Mellow_2

big Ed

It is hard to tell with out seeing it. Have you tryed unpluging everything on the high voltage side of the control. Then plug one in at a time and see when it starts to flicker. I have found problems by just having 120 volts going into the control with no circs, burners or lwcos in the mix. Just unplug them, then turn the control on, the flicker should be gone. Then turn the control off and plug in the burner. then turn it on again if it flickers then the burner would be causing the problem. Then you can trace just the burner wires to find the problem.



All the lights should come on when the control comes on at frist, then the control will try the circs and then go to the program. The program can take a minute to kick on the burner and this is normal but when the program is running the lights should not flicker. mellow

Big Ed

Tech Support

Called Buderus while on site. Made me pull everything and you had mentioned. Pulled ribbon leading to control also. They condemmed control. They made me change my lwco location before control rather then between control and burner. Gives you a line of protection against a surge. Thanks for all your help . Was a first for me.