How do I connect the hot water tank to the VIESSMAN VITODANCE 050 W furnace?

Hello

I recently purchased an old bungalow for renovation and it was time to change the furnace. I have chosen a VIESSMANN VITODENS 050 W for technical reasons, I now have a problem with connecting the DHW tank. If I understand correctly, I connect the manifolds from the floor under the heating circuit. I connect room controllers and actuators to the controller I purchased, the controller to the furnace to COM and NO contacts. At this point, the controller will, if necessary, start the furnace and the built-in pump, plus we still have an expansion vessel in the furnace itself, so here it should be ok. However, as far as the DHW tank is concerned, I understand that the furnace uses the water circuit. As far as I know, the furnace does not have any pump in this circuit, it works in such a way that when you let hot water run in the tap, the water starts to flow through the furnace, the internal sensor detects the flow and starts heating. I understand that by connecting the DHW tank, the water circulates in a closed circuit, so there must be a pump and a boiler water temperature sensor to give the signal to switch on the pump. And here I have a question, do I need another controller to operate this, or can I connect it to the furnace somehow???? If so, which contacts????

Thank you in advance for your help and please correct my thinking if I have misunderstood something.

Sometimes it's worth having the job done by a professional who has a clue, so that you don't make a mistake and have to redo it 10 times later.

Firstly, hot water cylinders are generally connected to single-function boilers.
Although there are special so-called stratified storage tanks which are connected to 2-function boilers.
The point is that the control of these solutions is slightly different.
The boiler doesn't use a 'water circuit', as I'm guessing you mean a hot water circuit.
Only the boiler water circuit and then, on such a circuit, the pump built into the boiler pushes water into the DHW cylinder.
In the case of stratified storage tanks, an external pump is used.

Unfortunately, I do not know what VIESSMAN VITODANCE 050 boilers are.
Perhaps you were referring to the VIESSMANN VITODENS 050 boiler?
It's just that it's not clear from this name which boiler you are referring to: the single-function or double-function one.

As far as room controllers and actuators for underfloor heating are concerned, I don't think you can get any sillier than that.

How the boiler should be connected to the system depends on how that system is built.
I'm just assuming that you're just going to build it.
If that's the case, then start at the very beginning, because so far you're starting on the 4D side.
What you've asked here only follows from the construction of the whole installation. Will there be underfloors alone or a mixed system. If a mixed system, why do you want to double the cost of building the installation and complicate it?

Besides, when building a heating system, especially an underfloor heating system, you can make a lot of mistakes that you may not be able to rectify later.
Building a system is not just about connecting the boiler to the manifolds.

>>21497106 Hello, everything is correct. I am green in heating technology. After watching a heap of tutorials on YT I decided to do the installation myself. The assumptions are: the whole house only underfloor, each room is to have an independent temperature control, the boiler, as you wrote, my mistake, is a dual purpose boiler. From what I understand, it should look like this: I let the central heating circuit run on manifolds, on them I mount actuators connected to the controller, I also connect room regulators to it, and the controller itself to the appropriate COM and NO contacts in the furnace. As far as the DHW is concerned, I connect to the coil in the tank, plus a safety unit with a selective vessel, plus a pump and controller with temperature sensor. Plus still directional valves on both circuits. As far as progress is concerned, I have a plan for now and have added all the components to the basket, but before I buy anything I prefer to make sure I have a good understanding of what works how. I read somewhere on the internet that you can hook up a pump and temperature sensor to the cooker, but I couldn't find any information on whether this is for the hot water circuit. Unfortunately, in the cooker manual on the wiring diagram there is only a description of the pump and temp sensor contacts without any other explanation. I would be very grateful if you would verify my reasoning. The only thing I would add is that I would take someone on, but unfortunately financially it is crumbling and still people who bought the house to renovate have been cut off from grants, so I have to manage differently. Regards.

You write that poorly financially, but push yourself into ill-considered and unnecessary, even harmful investments.

Why do you need these actuators and room regulators? Do you have nothing to do with the money?
This kind of control only worsens the performance of the installation.

It's very difficult to tell the layman, because an installation is not just a boiler and a few valves.
Here you have to calculate heat fluxes, flows, lengths and number of loops, select pumps and coupling if necessary, and this depends on the size of the installation, the area of the house. In addition, you need to take into account whether it is a single-storey or a two-storey house.
Calculate the heat requirements of the individual rooms depending on their purpose, the type of floor covering and the expected temperatures. Different temperatures are expected in the living rooms, others in the bedrooms and still others in the bathrooms.
Doing the underfloor heating "on the spur of the moment" usually ends in problems and additional costs later on.
Only some plumbers can calculate underfloor heating correctly. The rest make a mass of mistakes that they try to cure later with controls. They push expensive systems like strips and actuators in the manifolds + room controllers in each room. Such control is an additional expense of at least several thousand zloty, and it is needed like 'frog fins'.
Contrary to appearances, these are not simple things. Especially for someone who has not been exposed to building such installations for at least a few years. Although even just seeing or even doing it is no guarantee that someone will have the necessary knowledge.

Here where I work, we have a team of plumbers. A new employee came in recently who had worked abroad and was installing heating systems for a large company.
He started bragging about what he couldn't do and what he didn't know. On plumbing, on automation. He even started lecturing me on control systems. The coolest thing was his text to me: "if you don't know something, you can ask me". At the beginning I didn't even reveal who I was by education and what I did for a living, and I am an automation-electronics technician who has been working in the profession for almost 40 years, dealing with typical heating automation for 20 years .
When I asked the guy what his area of knowledge was, which was not much, I told him what I was dealing with and for how many years, and that he should fill in the gaps in his knowledge, because he was theorising a lot and his knowledge was far from the truth.
The guy knows a thing or two about screwing threads and valves, but has no knowledge of calculating flows, flow resistance and heat fluxes. He hasn't even heard of Bernoulli's formulae or Reynolds numbers. Just a typical plumber-practitioner without the basics of thermodynamic flow theory.
Without this, no proper calculation of underfloor flow rates, no selection of pipe cross-sections and no selection of suitable pumps can be carried out.