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yes I can, (If I can find a lifter) but nothing leaking anywhere, no drainage problems, and the upstairs bathrooms drain into the same manhole and there is no smell from those. to me it feels like the positive pressure from the flush is pushing the foul air to find a way out to atmosphere...

solid concrete floors.

spent a few hours reading about those before I posted. pretty sure the answer is a no. The stack at the back of the house is vented through the roof (its a 1970's house), this serves the two upstairs bathrooms. No smell issues there at all. The downstairs WC, the soil outlet is on a flexi...

hi I have a back to wall pan in a downstairs cloak room, soil pipe comes out horizontally into a flexible connector that goes down into floor behind the pan underneath the concealed cistern. This particular pan has been installed for about 10 years, on and off have noticed smells, but its...

yeah, I had a good read of the protocol spec as well a couple of months back once I started seriously trying to understand what was going on for myself. I design large and complicated country-sized networks that run internet service providers etc for a living, so I have to know a lot of protocol...

good question. I've written a "substantial" email to my installers, still waiting for their reply. Its not about the cost of the OT unit (bugger all in the grand scheme) its the 5 months of hassle trying to figure out why it wasn't working .... and all the time the assumptions on what was going...

well, the plot thickens. My installers specified opentherm, but having inspected everything in detail at the weekend, there is no opentherm! Nothing is plugged into X21 in the boiler. I have been installed a straightforward BDR91 boiler relay, sending switched live to the roomstat call for heat...

evohome is bloody brilliant for heating control. every room at the temp you want when you want it, the learning does work. I wanted to buy something from a company with a recognised background in heating controls, all my previous stats (e.g. CM67) have been honeywell, so stuck with them. Didn't...

ok, makes sense. so we are just giving it voltage on the room stat call for heat terminal. I will try to see if I can test this weekend. clearly you know the WB1B and expect this to work. do you expect it to go straight to 75, or work its way slowly up? if want it to go straight there, do we...

wb1b control inputs and temps

ok, W plan then.

thanks. as part of this test, do I also need to send a live to the relevant terminal on the cylinder demand terminal box? am I correct to assume that is there to tell the modulation logic to stay out of the way, and thus makes the difference between the boiler running in CH-mode, cool and...

I know its not a y-plan as strictly defined based on where and what type of valves, how they are controlled, etc. But it gives a logical OR, i.e CH OR DHW, which is exactly what Y-plan does, therefore to me, that proposal was pretty much analogous to running the system as Y-plan.

yep, makes perfect sense. I think my installers expected OT information from the evo controller to enable to boiler do that adjustment automagically, but its clearly not working. So, ditching the evo OT for a BDR91 and wiring the hot water kit's output into the cylinder demand terminals on the...

he didn't say the words y-plan. but what he described is effectively that: re-instate the master zone valve on the rad circuit - so it goes back to being S-plan in plumbing terms. However then wire the ouput (C I think from memory) of the evohome DHW kit so that when DHW demands, it forces the...

I have just RTFM the boiler installers manual. Its not exactly clear what a hot water doodah that you mention, however, page 15 block G = external 230v controls sw-live/Live/N block C = terminal box cylinder demand accessory see separate instructions. Is this what you mean? I am demanding that...

no I know the boilers not faulty. but its the only way to get them out (my installer is aware, he is going to be there same day). how exactly do you think the system should be laid out? use BDR91's only? interlock so that CH shuts off when DHW demand? or something else?

ok, apologies if offence given, I will put it differently. I decided I wanted evohome+a new boiler, I found 3 local installers on the honeywell site who were evo certified, talked to all of them, went with the one I felt happiest with. they specced the viessman, and the OT. I still have an...

1b1b yes. although system is sealed /pressurised (the expansion is on top of the pandora). the knob is already on 11. I will be calling viesmann out on it as a fault next week, but was hoping to get any clues before I did so hence this post. What exactly do you mean by "PL to the viessman" ? I...