Viessmann Vitodens room sensor

ALH_4

And there is where the subjectivity comes in. I would feel fine using the RS on Thermofin floors. I think it is fine on anything except concrete.

GW

Viessmann Vitodens room sensor

Guys, do I have to yank the control out of the boiler when I have a remote sensor? Does Viessmann not make a "plain" sensor to simply sense temp? Thanks, GW

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ALH_4

rs

Gary, you can use the RS sensor. It is shown on page 33 of the Technical Data Manual.

Uni R_3

But...

But not for an underfloor heating circuit - too much inertia - Viessmann's words, not mine.

GW

yes, it's a dry radiant system working off of the B circuit.

I've really stuggled with this room sensor thing in the past on another vito job. It must be me.

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Uni R_2

Hey Gary...

Have you thought about using a tn4 controller on the Vito instead?

GW

well, the system is already installed. tekmar can drive the viessmann? Certainly it makes sense to buy a basic room sensor instead of a tn4 I would think.

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Mike T., Swampeast MO

The Vitodens does not need to sense room temperature to control room temperature.

Paul Pollets

How True

If the system loop layout is correct, and the flow balanced, trying to enable the sensor is a waste of time. And absolutely not neccessary. Many techs only familiar only with Tekmar, seem to have a problem with this concept, and feel secure only with indoor feedback. Relax...let it go...go with the flow....

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Mike T., Swampeast MO

True modulation to the load...

It just happens in any reasonably suited system.

TONY_22

"Indoor feedback? We don't need no stinking indoor feeback."

Unknown

Which, as far as I can tell, is practically no home built in america

Correction: without multiple mixing valves, at which point, might as well have gotten the tekmar.

needle needle from a tekmar fan

ALH_4

other features

The other features of the RS are ok to have too. The user can put the system in day, night, or scheduled mode as well as shifting the day and night curve. All without having to mess with the boiler control, which could be nice.

GW

I'm getting a little lost, was there some pun interjected? I'm stumped on the "no need for indoor sensor". We have all sorts of people running wood stoves in their living space. How wasteful is that to have the boiler not know there's internal gains?

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Brad White_168

Gary- Room Sensors on a Vitodens

After over two months of smooth operation without a room sensor, the Vitodens at my Susan's simply does not need it...

I was going to move the Comfortrol to the living room for convenience and activate the sensor that is resident within that. (A blank plate for temperature indication goes into the Vitodens per code as you know.)

Convenience issues aside, there is simply no reason for us to do that. I may do so yet, but no driving reason to. It holds temperature beautifully, standing CI rads on a 1.1 curve.

GW

Hi Brad, I have two Vitos where the owners will run a wood stove at the area of the b circuit. Unless I'm just down trodden and spent, doesn't it make sense to knock the heat down in the system as the external energy source emits hundreds of thousands of btus? Please agree or I will jump!

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Brad White_9

Don't Jump!

At least not until the end of the dance!

Yes, if you have a wood stove you will need indoor feedback. I suspect at some level the Vitodens will know that the indoor load has decreased.... and will probably go make itself a cup of espresso or something.

Besides, your B circuit will have a mixing valve, right? So that is subordinate control right there. If RFH especially high mass, there is no way to respond that quickly and you should expect some overheating... I do not think that this can be helped.

If they use the wood stove all the time then perhaps a slab temperature sensor may be the key? Keep it just above room temperature as a base? Loose thinking but cranking up a 45-55 MBH Vermont Castings Defiant in a slab heated room strikes me as an odd match.

GW

yes B is on its own, yet it's still following a curve, so what's the difference? Of well, I guess I don't see the magic

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