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My Viessman boiler journey


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31 minutes ago, MrPotts said:

Use the switched live orange from the NC valve to apply power to the NO valves live connection. Then when there is a call for HW the NC HW valve will apply live to the NO CH valve thus closing it.

But tying the two browns together does that too doesn't it??

 

Not being confrontational here - if I'm not doing the right thing then I'm happy to learn why I need to do it a different way but to my mind both ways achieve the same result

 

I used the orange to power the HW demand box so I could have that in it's own section on the wiring centre because it's Viessmann thing to have an additional HW demand box.

 

 

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41 minutes ago, MrPotts said:

If you watch through the video he describes how to convert an s plan to PDHW with a NO valve.

 

I must have watched that video a bunch of times and I've not spotted that element

 

Annoyingly the only video that Syzmon has done that featured a Viessmann 100-W B1GA turned into a little whinge fest about how he wasn't impressed about the fact the HW demand box and wifi module were add on units and the boiler front cover didn't have a sound insulation panel in it like the system or combi boilers did.

 

He was making a valid points

 

The HW demand box is a bit of an add on

 

The Wifi module is hard to fit in the space and route nicely - if the ribbon cable was 2 cm longer it could be routed away from everything and look much neater than crossing the PCB at 45 deg

 

When heating HW at 100% modulation the 16kW rated boiler I have is throwing 19kW and 80 deg flow temp at the HW circuit and it's nowhere near as quiet as it is when it's doing CH at 3.2 kW and 37 deg C

 

I didn't want to convert to a 4 pipe system for all the disruption that caused and I wanted a boiler I could hide in a 300mm dept cupboard because SWIMBO wants to change the kitchen from white to black/dark gray and a white boiler on show would look crap

 

Sometimes we have to compromise to someone else's needs/wants ;)

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13 minutes ago, marshian said:

But tying the two browns together does that too doesn't it??

 

Not being confrontational here - if I'm not doing the right thing then I'm happy to learn why I need to do it a different way but to my mind both ways achieve the same result

 

I used the orange to power the HW demand box so I could have that in it's own section on the wiring centre because it's Viessmann thing to have an additional HW demand box.

 

 

Sorry, I missed the bit where you said you had the browns together, yes that would also work.

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6 minutes ago, JohnMo said:

Your drawing looks way more complicated than the cdt box drawing 

Screenshot_2024-10-18-15-42-58-81_f541918c7893c52dbd1ee5d319333948.thumb.jpg.d0ced014c8f4224514846d2673104e3d.jpg

You do realise "my drawing" is of all the wiring centre (well when I finish it) and what you have posted is a diagram of how the HW demand box integrates with the boiler 😞

 

I must admit I've borrowed the base drawing from an S plan which is what the gas engineer set the system up to work as despite being asked to set it up as X plan!!!

 

51011_01-mBox-L32-S-Plan-connection-drawing-FRAMELESS.pdf

 

 

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38 minutes ago, marshian said:

You do realise "my drawing" is of all the wiring centre (well when I finish it) and what you have posted is a diagram of how the HW demand box integrates with the boiler 😞

 

I must admit I've borrowed the base drawing from an S plan which is what the gas engineer set the system up to work as despite being asked to set it up as X plan!!!

 

51011_01-mBox-L32-S-Plan-connection-drawing-FRAMELESS.pdf 23.56 kB · 0 downloads

 

 

Yes I realise your drawing is for the whole wiring centre, so is the Viessmann one, letter G representing the wiring centre, it has all the central heating system control, hot water control and interface with the boiler.

 

Your S plan just says boiler stop start, nothing else. The Viessmann drawing shows a switched live through your room thermostat for switch box L terminal to terminal 1.

Your drawing doesn't show any such connections. In fact your room thermostat is really doing anything? 

 

Dump the S plan and use the Viessmann drawing. Drive your 2x 2 port valves as suggested above via switch in one 2 port.

Edited by JohnMo
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1 hour ago, JohnMo said:

Yes I realise your drawing is for the whole wiring centre, so is the Viessmann one, letter G representing the wiring centre, it has all the central heating system control, hot water control and interface with the boiler.

 

Your S plan just says boiler stop start, nothing else. The Viessmann drawing shows a switched live through your room thermostat for switch box L terminal to terminal 1.

Your drawing doesn't show any such connections. In fact your room thermostat is really doing anything? 

 

Dump the S plan and use the Viessmann drawing. Drive your 2x 2 port valves as suggested above via switch in one 2 port.


you’re a very clever chap but either I am really rubbish at explaining stuff (and I can accept that criticism if I am) or your reading and comprehension skills are a bit poor and I’m going to assume it’s the former rather than the later for now

 

As I said in earlier post CH side is not fnished in the drawing - I’ve just managed to get the HW side working as it should along with the transfer from CH to HW and back to CH having completed HW - not finished would account for some missing wires OK ;)

 

 

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Just to repeat - I asked for X plan - I got S plan (2 NC zone valves) with weather compensation (turned off because I like HW not CW) and set it up with a 55 deg flow temp

 

no HWD box 

no wifi interface (was on back order)

 

Installer came back with one new NO zone valve, HWD box (after I told him the part numbers for both) and said will you order it or shall I?) and the long awaited for wifi module

 

he’s had two opportunities to get it working right on x plan DHWP and hasn’t really got it right - I still have issues with control on CH side so I revert to what I often have to do “If I want a job doing properly I need to do it myself’ 

 

DIY means starting from scratch working out what all the wires do and drawing up a schematic that makes sense to me - Electrics are not my strong point but so far no fuses have been sacrificed to my electrickery knowledge quest

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Current state of wiring centre

 

IMG_5186.thumb.jpeg.f24ce8750c74f269d40961e95343d606.jpeg

 

orange now located in bottom right and linked to HWD box 

 

grey is now in the live lot (top row left side)

 

Reminds me - all the grey cables at the bottom were clamped before the install

 

after none were clamped and the clamps were gone…..

 

as a result I bought another L16 wiring centre to get new clamps and screws because I was less than happy about unclamped wires in a traffic area (SWMBO) keeps her ironing board and irons on the floor and shes a bit heavy handed

 

Remember this is a Viessmann trained installer - only one in 50 mile radius

 

I hate ending posts negatively - shat’s done is done I’ve clearly reached a point where I need to do this myself and any help or advice in this direction is appreciated and I can move forward positively :)

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29 minutes ago, MrPotts said:

Sorry but I am confused now. You don't have the CH demand connected to the boiler so presumably CH isn't working? Maybe I missed something, again!


it’s connected and it sort of works - just haven’t documented that section of the wiring on my schematic

 

sort of works……….

 

I currently have to turn the boiler off to stop CH - it leaves the pump on 24/7 even if the controller says all good house up to temp lets wait for the call for more heat 

 

flow temp of 32 deg C today and all rooms are at target temp on trv’s so all the flow is going thro the bypass right now so I’ve stopped the boiler in the ViCare app

 

 

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So the connection has been made within the boiler to connector X1 position 1 and the link removed? This is going by what the boiler install manual says.

Edited by MrPotts
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1 hour ago, marshian said:


you’re a very clever chap but either I am really rubbish at explaining stuff (and I can accept that criticism if I am) or your reading and comprehension skills are a bit poor and I’m going to assume it’s the former rather than the later for now

 

As I said in earlier post CH side is not fnished in the drawing - I’ve just managed to get the HW side working as it should along with the transfer from CH to HW and back to CH having completed HW - not finished would account for some missing wires OK ;)

 

 

Just think your making a job very complex, just follow the manufacturer instructions. The supplement info for the outside sensor attached also.

 

The simple wiring on the second section.

 

With that I will get my coat.

 

 

WB1B Compact Outdoor Sensor Instructions.pdf

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1 minute ago, MrPotts said:

So the connection has been made within the boiler to connector X1 position 1 and the link removed? This is going by what the boiler install manual says.

What connection??

 

boiler has

 

Direct control of the pump

HWD box wired in

Weather Compensation sensor wired in


The boiler has been “told” to run in weather compensated operation mode

 

The link wire is still in place and I think it’s running on a permenant live and Neutral only with no switched live in sight 

 

But as I’ve said electrickery is not my strong point - if it’s got oil or water in it or it needs to fabricated in steel or wood or whatever I’m fine with it :D

 

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2 minutes ago, JohnMo said:

Just think your making a job very complex, just follow the manufacturer instructions. The supplement info for the outside sensor attached also.

 

The simple wiring on the second section.

 

With that I will get my coat.

 

 

WB1B Compact Outdoor Sensor Instructions.pdf 124.52 kB · 0 downloads

I’m trying very hard to do three things

 

1. understand how it works

2. Save the life of a fuse by not getting it wrong

3. Keep the smoke inside the wires

 

thank you for your input but this is not my strong suit so I will be painfully slow in progress

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12 minutes ago, marshian said:

What connection??

 

boiler has

 

Direct control of the pump

HWD box wired in

Weather Compensation sensor wired in


The boiler has been “told” to run in weather compensated operation mode

 

The link wire is still in place and I think it’s running on a permenant live and Neutral only with no switched live in sight 

 

But as I’ve said electrickery is not my strong point - if it’s got oil or water in it or it needs to fabricated in steel or wood or whatever I’m fine with it :D

 

It looks like the link is providing a permanent live to terminal 1 on connector X1 which looks like it is the CH demand hence the boiler runs continually.

Edited by MrPotts
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7 minutes ago, MrPotts said:

It looks like the link is providing a permanent live to terminal 1 on connector X1 which looks like it is the CH demand hence the boiler runs continually if the room thermostat demands heat even with the programmer off.

 

Highly likely - That will be down to the gas engineer to resolve - I'm absolutely fine with doing everything outside the boiler - not so fine with stuff inside it.................

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13 hours ago, marshian said:

 

Highly likely - That will be down to the gas engineer to resolve - I'm absolutely fine with doing everything outside the boiler - not so fine with stuff inside it.................

If the link is still in place I think the boiler will think there’s is a permanent demand for CH hence why it stays on until you turn the boiler off.

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25 minutes ago, MrPotts said:

If the link is still in place I think the boiler will think there’s is a permanent demand for CH hence why it stays on until you turn the boiler off.


as the link is external to the PCB I decided to remove it…….

 

No pump at all :D

 

 

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3 hours ago, marshian said:


as the link is external to the PCB I decided to remove it…….

 

No pump at all :D

 

 

What’s the GC number of your boiler? Edit found it on post 1

Edited by MrPotts
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Sorry for slow reply - my attention has been diverted to bathroom issues

 

IMG_5191.thumb.jpeg.b18eac288cb7f5374e5a66e6cf3f370e.jpeg

 

shower waste needed replacing and access was too tight with the soil pipe in the way - luckily I did the bathroom myself so knew how it all went together ;)

 

Later today I’ll check out the boiler connections

Edited by marshian
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9 hours ago, MrPotts said:

Have you made all the connections to the boiler as per attached?

 

 

IMG_1733.png

 

Sorry had to rip apart my bath room to replace a shower waste that was letting in smells

 

So connected (Not me) but AFAIK

 

Outside temp sensor yes

HW Demand box

Power to the Boiler (Live, Neutral and Earth)

 

After that sorry but not a clue

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1 hour ago, marshian said:

 

Sorry had to rip apart my bath room to replace a shower waste that was letting in smells

 

So connected (Not me) but AFAIK

 

Outside temp sensor yes

HW Demand box

Power to the Boiler (Live, Neutral and Earth)

 

After that sorry but not a clue

OK, i think its time to get someone in that can investigate how the boiler has been wired.

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