Refilling Water in Viessmann Vitodens 100: Step-by-Step Guide for Low Pressure Issue

Question

Gentlemen

I am green on this topic, and I cannot get through to the installer. Can any of you tell me how to top up the water - step by step? I have 1.2 pressure when the stove is turned off, and 0.8 when it is turned off. As far as I know, it should be 1.4, I am speaking well? Help please

Stove: VITODENS 100 Viessmann - single-function - next to a water boiler, underfloor heating (it can be seen on 200414)

greetings
ROBERT

zgryzliwy · Answer

Hello. If I were you, however, I would contact the installer. Low pressure indicated by the pressure gauge may have many reasons. Maybe you have a leak somewhere, or the pressure equalization tank is damaged. Adding water alone will not solve the problem, more important is to find the cause. where you can get information on how to top up the amount of water in the installation and how to fix similar problems, so as not to damage the installation. If it is a new installation, it has a warranty.

gersik · Answer

You probably have these valves connected by a hose behind the DHW tank.

pabrob · Answer

Gersik Can you tell me how to do it while looking at this picture? I understand that with the stove off. How much should the target pressure be? I know that the green one is a circulation pump .. And I already got lost with this functionality .. because on the hotline they said that I had two and my neighbor also says two .. so I don't get it .. but this I guess it doesn't matter to my question .. Snappish Sure, I will only do it when the installer is available .. so far I have no contact with him .. I think there is a vacation or something

grzes69 · Answer

Hi You need to connect the hose to this valve in photo 2, change the valves and top up to the required pressure> 0.8 bar. Go to Vissman's website, there is a manual for this furnace.

Anonymous · Answer

Not true. Above the circulation pump you have 2 closed valves and a hose between them. You add it this way. You open one valve slightly (e.g. halfway) and then with the other one gently (taking care not to do it too quickly because it is easy to overdo it) you let water in. If the installation is not high then you don't need to be more than 1.0. Unless, during commissioning, the service technician pumped the expansion vessel, then you should set 0.2 more on the installation than in the vessel. 1.0 is enough for you for everything, also don't overdo it with this pressure (add it so as not to exceed 1.5). Greetings

gersik · Answer

I wrote about it.

Anonymous · Answer

Yes, but the user asked how to do it.

pabrob · Answer

Thank you Walker29 and Gersik for the next tips. When I fill it, I will let you know that everything is ok and we will close the topic only the problem is that I searched the manual and does not write anywhere what the pressure should be. He only writes no less than 0.8. Hmm .. what is your experience and how should i set it up?

pabrob · Answer

Thank you for all your help .. exactly where he wrote Walker29 there are valves for adding water to the installation .. I added 1.5 - that is, as I found on the forums and that's what I have with the stove on and working. Thanks again for your help.