Weather compensator and efficiency regs

[Newts]

Now, now chaps, calm down. Vaillant called me back today to confirm that their weather compensator did actually enable interlock and Simon your right that it is in some way done by some algorithms that measure outside temp, flow and return temp and your set temp. How it actually works I dont know, but Vaillant are adamant that their device is the latest in efficiency devices and this setup is to current efficiency standards.

 

[BigBurner]

Unfortunately most manufacturers only allow competent heating engineers on their courses.

Then that precludes most of Corgi men going by the quality of the installs lately. "Competent" does not equate to being on a Corgi list.

 

[BigBurner]

Now, now chaps, calm down. Vaillant called me back today to confirm that their weather compensator did actually enable interlock and Simon your right that it is in some way done by some algorithms that measure outside temp, flow and return temp and your set temp. How it actually works I dont know, but Vaillant are adamant that their device is the latest in efficiency devices and this setup is to current efficiency standards.

If they do not have something in writing stating this, it does not give a "control interlock" and falls foul. They have to prove it does.

"and your set temp". What set temp is this?

 

[simond]

The ego is with you, thinking you know how something works because a makers rep told you. I don't need a domestic maker to explain control to me as I once specialised in commercial control. I would end up taking over the course.

Man without portfolio speaking again. Call the nurse.

 

[JPC]

the viessmann control the house temp from flow and ret temps, outside temps and knowing the fabric of the building...this is input at set up times by the engineer

the set temp there talking about is the room temp that is set on the boiler (but take that with a pinch of salt if boiler is in a cupboard)

 

[gas4you]

It has nothing to do with the air temp around the boiler, it is the room temp required and determined by the built in algorithms, depending on the flow and return temp and outside temp, so makes no difference where the boiler is installed.

 

[JPC]

ha...so that does not read a temp of the surrounding air.....jjst telling the boiler what temp you like the house to be...gotcha

 

[gas4you]

ha...so that does not read a temp of the surrounding air.....jjst telling the boiler what temp you like the house to be...gotcha

If the unit is placed on the wall as a room stat, then it does sense the room temp as a normal stat does.

 

[BigBurner]

the viessmann control the house temp from flow and ret temps, outside temps and knowing the fabric of the building...this is input at set up times by the engineer

If there is no temp sensor in the heated space then it can only approximate the room temp. And all this assumes the rads are sized properly and the pipework too, and balanced correctly too.

 

[BigBurner]

ha...so that does not read a temp of the surrounding air.....jjst telling the boiler what temp you like the house to be...gotcha

It is called a parameter - a fixed figure. About the only one as all the rest are variable.

 

[Norcon]

Sounds as if the boiler will cycle on/off around the boiler flow temp calculated set point with the pump running constant. Sorry OP but I wouldn't put too much faith in what the Vaillant tech helpline might tell you.