Vitodens 100-W W1 B1C Expansion Vessel Issues: Pressure Drop, Water Leak, & Membrane Replacement

Hello,

For about half a year I have been observing cyclical pressure drop in the central heating installation. Today I decided to check the pressure in the diaphragm vessel out of curiosity. I unscrewed the jumper cap, connected the manometer and instead of measuring half a liter of water fell out of the valve (the valve hung after pressing). I barely turned it on, it just crumbled. I cleaned the internal thread, installed a new car vent, inflated the air, but ...
Well, should the water in this vessel be mixed with air, or has the membrane broken? The furnace is only 2 years old, inspections were carried out, except for the motherboard that had fallen once he didn't cause any problems.
If it is necessary to replace it, can I buy such a diaphragm vessel myself? The exchange looks very easy.

Thanks in advance for your help.

When the water flew it is damaged.
You can buy and put on the dish yourself but you will not receive a guarantee for it.
You live in an apartment or at home. Where is the boiler installed?

So, for exchange ... I found such a dish in an online store for 390 PLN, the Vissmann part number is 7837231 (maybe someone will use it), the link is intentionally not given.
I live in a house, a boiler in the bathroom. Does it matter in this situation?
Can using the vessel in its current condition cause any problems? Will the air mix with water and spread throughout the entire installation?

tomix wrote:

Can using the vessel in its current condition cause any problems?

During heating, the pressure in the system may jump to 3 bar and the boiler safety valve will open. As you know, water increases in volume as the temperature rises.

tomix wrote:

I live in a house, a boiler in the bathroom. Does it matter in this situation?

You do not need to buy the original dish. In the basement or other storage room you install a universal diaphragm vessel with a volume not less than what you have installed in the boiler. Of course, the pipe from what the principle of operation will be exactly the same as that built into the boiler.

@tomix
If you decide to replace the vessel, I recommend adding a special shut-off and drain valve to the diaphragm vessel, which is useful for any servicing, e.g. you can disconnect the vessel without draining water from the heating system. Useful if, for example, we want to check or top up the precharge pressure in the diaphragm vessel.

However, I think I'll decide on the original dish. The whole central heating installation together with the boiler is on the same level, it is a flat. I can only put on the expansion vessel inside because it will not look aesthetically pleasing and I would have to modify the installations Thanks to this, the problem of draining water falls off, because the furnace is the highest point in the system. I will let you know after the exchange, maybe I will upload a photo.

Your original is relatively cheap, because it costs about PLN 730 to my old Vaillant, so the original fell off because of the price. In the case of an apartment, for PLN 390 I wouldn't even think, just take the original.
I don't know about you, but in my old Vaillant, you can only pull out the vessel after removing the boiler from the wall, so you have to take into account the worst. While disconnecting the water unit is a pikus, gas is a bigger problem.

I come back with some news. I was able to replace the diaphragm vessel, I do not throw any pictures because it is screwed with only one nut from the top of the furnace, 10 mm. Replacement is trivial, a bit westerly with draining the furnace water (only the furnace, not the installation) and subsequent filling + venting. I checked out of curiosity, the new one has exactly 1.0 bar inside. Oddly enough, the old one after disassembly was also some residual pressure, despite the fact that water was pouring from the valve, and during the last tests I pumped up to 1 bar. I conclude that the leak was "half", but as it is technically resolved - I have no idea.
400 PLN back and an hour of work.

Hello.
I have the same problem that concerns the exchange of a collecting vessel for replacement, could you describe to me what I have to do after replacing the vessel itself, I think it is trivial, but I have a problem in bringing the installation into a proper condition.
I am interested in instruction from the moment the vessel is attached
I will be grateful for your help.
Greetings.

Hello, with the vessel itself, of course, nothing needs to be done, I assume that the factory diaphragm is supplemented with the right gas / air to the correct pressure. Pay attention to venting the system and topping up to the correct pressure. The venting procedure is described in the service manual for the boiler, I do not know the order of operations by heart.

Service manual: http://www.viessmann.com/web/poland/pdf-90.ns...todens%20100-W%20B1HA,%20B1KA%20(09.2014).pdf
page 26.

Hello, there is a problem with the boiler, it shows me 3.6bam
Where is the pot in the boiler with behind the bag. Is the cause of such high pressure a damaged vessel? I will add that he will use the boiler from yesterday.

Drututu wrote:

Where is the pot in the boiler with behind the bag.

About the dish was written in your thread, so why duplicate matters.
Download the service manual, where you can see in the diagram where the vessel is.
It follows that it is on the left when you remove the boiler casing.
The valve is in the upper part of the vessel and protrudes from the upper part of the boiler casing.
If you have 2 left hands, you can not read the diagrams and instructions and you feel that the whole thing is overwhelming you, do not try and call a service technician, because if you want to save money you can lose even more.