viessmann — boards.ie - Now Ye're Talkin'

Viessman Vitodens 200-w wb2b

stueymc — Fri, 20 Jan 2023 15:01:41 +0000

Looking for a bit of help/advice if possible.

I have a Viessman Vitodens 200-W WB2B gas boiler fitted. It is about 10 or 11 years old, runs perfectly. It has a integrated, factory fitted timer. The heating system is two zone - rad.'s and hot cylinder - controlled by Danfoss room stat., cylinder stat., and a RX2C controller. Heating only, no DHW. The built in timer is a bit simplistic, and not wifi. And from that I can figure out, to go the Viessman route of making the boiler wifi accessible is both awkward and expensive. Ideally I would like to put in an Optimium OP-BM-IHTWF01 Wi-Fi Boiler Module (or something similar) but can not figure out how. In theory I know I have to bypass the built in timer/controller, and set the boiler to permanently ON, and then let the external timer take over. Has anyone any experience with this type of boiler? Or has anyone already solved this problem, and is willing to share the "How"?

Thanks very much.

Combi Boiler Viessmann stopped working 2nd time in 7 years on Christmas Eve.

Basilio — Sun, 25 Dec 2022 01:07:15 +0000

My Vitodens 100-W B1KA26kW is flushing code "F2" and sending presents of chilly Holidays.

Originally installed 09/2015 by official Viessmann installer managed to last 3 years. Called the installer, he dismantled whole unit to parts and advised me to install new unit. I contacted Irish Viessmann`s Head Office and was redirected to guys doing guaranty work for merchant. After waiting for a few week boiler was reassembled, heatexchanger cleaned, rubber hoses replaced and unit worked (not without glitches) till 23/12/22. Thanks God it is not below 0 outside.

Contacted company who fixed and reinstalled unit in October 2018, got advise to buy a new Viessmann for €3800.00 installed. To my comments regarding the Price vs Reliability ratio got advise " other boilers are not as efficient as Vitodens". To my comment regarding warranty and chances new unit would break in 3-4 years again got reply "warranty only covers parts but quality of water to blame". Other brands maybe not as efficient but work for years longer I believe.

What brand/installer should I go to avoid changing/repairing boiler in the next 3-4 years? Any festive advise would be highly appreciated. Have a warm Holidays!

Will new Viessmann system save me money?

BenAndJerry — Mon, 13 Jul 2020 10:20:23 +0000

Hi All,

I had an annual boiler service last week. I currently have a Potterton Performa System HE - it's about 12 years old and it's running in my four bedroom semi detached house. The service guy said that while most things were in good shape a couple of the flue seals (for the burner, spiggot and elbow) were a bit worn and needed to be replaced soon. He also said something about the pressure buildings up and recommended that an external 12ltr expansion vessel be fitted in the hot press.

Obviously this would all cost money (ball patk €400+VAT) and he suggested that another option was to install a new boiler - he was recommending a 30KW Viessmann system boiler with a 5 year parts and labour warranty. He was saying that the Potterton was a very early condenser boiler and that the Viessmann would be much more efficient and save money on my monthly gas bill.

So, what do you guys think - is there likely to be much of a monthly saving? The cost of the new boiler install is in the region of €2,800 +VAT apparently....

Thanks for any input.

Viessmann Vitodens 200 W System 26 KW Design Questions

Colmrenault — Sat, 09 Oct 2010 17:30:51 +0000

I was wondering if you can help me with the design of my heating system that I am upgrading. I plan to buy a Viessmann Vitodens 200w system 26 Kw (WB2C). Ideally I want to plumb the radiator flow and return to a System Zone 4 manifold, as I have very poor circulation down stairs compared to upstairs and want to run the pumps a different speeds. The beauty of the System Zone is that once the pump is off no flow will occur in that circuit, thus eliminating motorised valves, which I have had desperate trouble with unreliability in the past.

http://systemlink.ie/systemzone-product-ireland.asp

The copper cylinder coil will be fed separately from the boilers second set of flow and returns.

The System Zone manifold will be fed from the left with the boilers own pump. From the bottom of the System Zone there will be two flows & two returns, one set feeding upstairs & the other feeding down stairs & each will have it’s own circulation pump.

Upstairs & downstairs has conventional radiators. Both zones need to have separate time & temperature control. My original plan was to combine the pumps, time clocks & Zone thermostats with a System Lex wiring centre…

http://systemlink.ie/systemlex-product-ireland.asp

This can control up to 4 separate zones with individual time & temperature & individual pump control. It can produce a switched 220 volt call for heat or a zero volt call for heat. This would be no problem with the Vitotronic 100 standard controls on the WB2C version of the Vitodens 200W.
However I want to use the Vitronic 200 Advanced weather compensation module. This seems to talk digitally with the boiler and is constantly aware of the outside temperature and modulates up & down accordingly.

My plumber is under the impression that he can still use the System Lex to call for heat from the boiler with the didital Vitronic 200? Is this true?
If it is the System Lex can look after starting the pump.

Even if it can my problem with this though is that the traditional zone thermostat is only either on or off which doesn’t give the boiler the chance to modulate down as the zone approaches the target temperature.

Preferably I would prefer to use two Vitotrols 300A’s, one controlling upstairs & one controlling downstairs. Two of these will plug straight into the Vitotronic 200 doing away with the Sytem Lex altogether perhaps?

As they can communicate digitally with the boiler would I be correct in saying that the boiler can modulate down as the zones approach target temperature?

If so the problem I have now is how do I get the boiler to turn on and off the pumps for each zone?
There seem to be two electrical add-ons available, namely…

Extension AM1 & Extension EA1.

From the technical guide…

Extension AM1
Part no. 7429 152
Function extension inside the casing for wall mounting.

Using the extension enables up to two of the following functions to be achieved:
Function Rated breaking capacity of the relay output
– Switching the DHW circulation pump (only with the Vitotronic 200, type HO1A)
– Switching the heating circuit pump for a directly connected heating circuit
– Switching the circulation pump for cylinder heating (not for boilers with integral DHW cylinder)

Can two of these outputs be triggered by the 2 vitotrol 300A’s to turn on their respective pumps on the System Zone manifold?

Extension EA1
Part no. 7429 151
Function extension inside the casing for wall mounting.

Using the inputs and outputs enables up to 5 functions to be achieved:
Function Rated breaking capacity of the relay output
1 switching output (zero volt changeover contact)
– Central fault message output
– Switching a feed pump to a substation
– Switching the DHW circulation pump (only with the Vitotronic 200, type HO1A)
2(1) A 250 V~

1 analogue input (0 to 10 V)
– Set boiler water temperature default

3 digital inputs
– External heating program changeover for 1 to 3 heating circuits (only with Vitotronic 200,
type HO1A)
– External blocking
– External blocking with central fault message
– Minimum boiler water temperature demand
– Fault messages
– Brief operation, DHW circulation pump

What about this one?

Another question I have is what happens when the boilers internal diverter valve gives priority to the coil and cuts flow to the System Zone manifold and sends all the hot water to the coil (pumped by the boilers internal pump). I assume it’s no harm to leave the two other zone pumps running.

My next question is regarding part number 7408012 room temperature sensor. Would I be correct in saying that this is a hard wired sensor that can be mounted remotely from the boiler? I assume I do not need this if I order two Vitotrol 300A’s.

Regarding the …

Mounting base for programming unit
Part no. 7299 408
To be able to freely position the programming unit of the control unit
anywhere outside the appliance.
To be fitted directly to the wall or a surface box.
Distance from the boiler: Observe the lead length incl. plugs of 5 m.

Can I cut this lead and solder in an extension. 15m should do me?

I was going to put two grundfos alpha 2’s pumping upstairs and downstairs. As you may know this is a variable speed pump with high efficiency.
Would it be best not to go for the optional variable speed high efficiency pump in the boiler itself. Maybe they would confuse each other?

Finally do I need mixing valves on the heating circuits?

Thanks for your help with these questions. My main objective here is to avoid motorized valves at all costs and to have maximum modulation, thus increasing condensing duration/efficiency.

Colm (colmrenault@yahoo.co.uk)