Viessmann vitodens 100-w

[thomo27]

Evening all
Has anyone here wired the above boiler with a cylinder stat and a room stat via a 2 channel programmer?

 

[JohnD]

Why do you ask?

 

[thomo27]

Hi John
Just having an issue with it and thought I'd ask before I write war and peace about it..

 

[JohnD]

mine is like that. But it has a programmable room stat so the timer/programmer is set to CH continuous and HW twice.

It is not zoned.

 

[thomo27]

No not zoned
It's a combination boiler used on kind of a S plan
Valve for hot water only..
Cylinder stat set to 60 but boiler running continuously i.e cylinder stat not switching off ( water is red hot)

 

[EFLImpudence]

Cylinder Stat faulty

 

[JohnD]

or incorrectly wired?

What sort of motorised valve does it have?

If you set the timer to HW off, then HW should go off regardless of the cylinder stat condition.

Did it ever work correctly?

What temp is the boiler set to? It must be higher than the cyl stat. What actual temperature is the tapwater?

Who wired it?

 

[thomo27]

or incorrectly wired?

What sort of motorised valve does it have?
Not sure can check tomorrow..it's purely for hot water only
If you set the timer to HW off, then HW should go off regardless of the cylinder stat condition.
It does..

Did it ever work correctly? The heating works but when the cylinder stat is up to 60 degrees the boiler just shows the tap symbol so the heating doesn't get a look in

What temp is the boiler set to? It must be higher than the cyl stat. What actual temperature is the tapwater?
Boiler was set to 6 about 80 degrees

Who wired it?

I wired it

 

[JohnD]

and did it ever work correctly?

 

[thomo27]

and did it ever work correctly?

No it hasn't

 

[Jackrae]

In that case drawing of how you have wired it and pictures of actual wiring terminations on valve and boiler would assist in crystal ball gazing

 

[thomo27]

In that case drawing of how you have wired it and pictures of actual wiring terminations on valve and boiler would assist in crystal ball gazing

 

[Agile]

You have never answered the question about what temperature the boiler is set to provide.

While heating hot water, the boiler needs to be set to provide about 10 C above the set water thermostat.

The cylinder stats are not exactly precision devices and it is difficult to set them to a particular cylinder temperature based solely on their calibration without measuring the actual water temperature.

Tony