JohnMo Posted December 19 Share Posted December 19 22 minutes ago, Tom said: 100mm off the floor and I have a ~50mm high piece of trunking for the hose/pipe to go over How does water drain if it has to go upwards? Sorry that is not a fix, and will not work. Head scratching time - plan your route that only falls away from unit - only you are there, so only you can do that bit Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 2 minutes ago, JohnMo said: How does water drain if it has to go upwards? Sorry that is not a fix, and will not work. Head scratching time - plan your route that only falls away from unit - only you are there, so only you can do that bit The pipe along the floor would form the U bit of the U bend, as long as the downstream end of the U is lower than the upstream end, then water will flow through it, like any U bend I guess. I can drill through the floor closer to the unit and drop the pipe through though, which seems less of a bodge. Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted December 19 Share Posted December 19 2 hours ago, Tom said: They said it was up to my plumber (ie me) to connect up the condensate drain. The problem is they are a commercial ventilation installers rather than domestic, if that makes a difference, so perhaps they see their remit slightly differently Indeed, but the other stuff is definitely them. For now make sure the drain has got a reasonable bend in it to create a good pool of water for the water trap, the more in there the less likely it is to suck air back up. Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 33 minutes ago, MikeGrahamT21 said: For now make sure the drain has got a reasonable bend in it to create a good pool of water for the water trap, the more in there the less likely it is to suck air back up. 1 hour ago, JohnMo said: You need a proper dry trap, like Hep2O ones, close to the unit. What sort of trap do I need? If the drain hose is sucking in air then would it allow a dry trap to open? Link to comment Share on other sites More sharing options...
JohnMo Posted December 19 Share Posted December 19 3 minutes ago, Tom said: What sort of trap do I need? If the drain hose is sucking in air then would it allow a dry trap to open? No that isn't how they work. They exactly the same as a normal trap, but with a membrane, that only allows one direction flow. First item that came up https://www.toolstation.com/viva-magna-self-sealing-waste-valve/p16545?store=LJ&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gad_source=1&gclid=CjwKCAiApY-7BhBjEiwAQMrrEV8HMBkKJNR2kKR371ncf4vxKMtfeMcDxK9vPqoY9c1Wyv_FiS0yzxoCbYEQAvD_BwE Link to comment Share on other sites More sharing options...
Conor Posted December 19 Share Posted December 19 Once you have a trap full of water, it's weight will be greater than the negative pressure from the unit. Was there not one supplied with the unit? It can even be a loop of pipe to form a trap. I've still not got mine plumbed in and it's just flowing in to a tub. Only need to empty it every couple of weeks or so. Is this a newly completed build, then your house will be soaking and the unit will want to be boosting. Override the humidity settings and set the fan to something like 33% Link to comment Share on other sites More sharing options...
JamesP Posted December 19 Share Posted December 19 (edited) McAlpine Tundish. Edited December 19 by JamesP Name Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted December 19 Share Posted December 19 50 minutes ago, JamesP said: McAlpine Tundish. Don’t tundishes have holes in them? Not suitable for MVHR drain if it has Link to comment Share on other sites More sharing options...
Thorfun Posted December 19 Share Posted December 19 (edited) 2 hours ago, JohnMo said: No that isn't how they work. They exactly the same as a normal trap, but with a membrane, that only allows one direction flow. First item that came up https://www.toolstation.com/viva-magna-self-sealing-waste-valve/p16545?store=LJ&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gad_source=1&gclid=CjwKCAiApY-7BhBjEiwAQMrrEV8HMBkKJNR2kKR371ncf4vxKMtfeMcDxK9vPqoY9c1Wyv_FiS0yzxoCbYEQAvD_BwE i've used traps like these (but different make) in a few places (under the bath and sinks in the bathroom) and like them a lot. Edited December 19 by Thorfun clarified that not this exact make of trap i used Link to comment Share on other sites More sharing options...
dpmiller Posted December 19 Share Posted December 19 best to ensure a vertical drop before these dry traps I find, there can be a bit of water builds up before there's enough weight to "open" the membrane Link to comment Share on other sites More sharing options...
JamesP Posted December 19 Share Posted December 19 (edited) 1 hour ago, MikeGrahamT21 said: Don’t tundishes have holes in them? Not suitable for MVHR drain if it has MCALPINE TUNDISH 19/23MM X 19/23MM (5684V) (9) Write a reviewAsk a Question Clear non-return valve manufactured in polypropylene with 19 / 23mm universal compression connections. Prevents backflow in overflow pipes. Valve opens with the weight of the liquid, allowing it to flow through and then closes once the liquid has passed. Mechanical Non-Return Valve For Use in Vertical Position Edited December 19 by JamesP Detail 2 Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted December 19 Share Posted December 19 30 minutes ago, JamesP said: MCALPINE TUNDISH 19/23MM X 19/23MM (5684V) (9) Write a reviewAsk a Question Clear non-return valve manufactured in polypropylene with 19 / 23mm universal compression connections. Prevents backflow in overflow pipes. Valve opens with the weight of the liquid, allowing it to flow through and then closes once the liquid has passed. Mechanical Non-Return Valve For Use in Vertical Position ahh, smart, not seen one of those ones 1 Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 Well that was a fun evening, managed to get the c9ndensate all hooked up with 22mm pipe, dropping through the floor and connecting to a McAlpine trap: Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 1 Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 Many, many thanks for all the helpful advice. I've turned the humidity limit up to 85% and the the thing's as quiet as a mouse. I might have to go and check it's still on... Link to comment Share on other sites More sharing options...
Tom Posted December 19 Author Share Posted December 19 Oh, and the installer said it wasn't their job to insulate the external feed duct, ffs. It's only a short run, guess I just need to wrap in rockwool? Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted December 19 Share Posted December 19 3 minutes ago, Tom said: Oh, and the installer said it wasn't their job to insulate the external feed duct, ffs. It's only a short run, guess I just need to wrap in rockwool? The foiled rockwool, to prevent condensation on the pipe forming, and foil tape on any joints. Glad the unit is behaving now your connected the drain Link to comment Share on other sites More sharing options...
Thorfun Posted December 20 Share Posted December 20 12 hours ago, Tom said: said it wasn't their job to insulate the external feed duct wtaf! Link to comment Share on other sites More sharing options...
Tom Posted December 20 Author Share Posted December 20 14 minutes ago, Thorfun said: wtaf! I know. They said they could come back and do it but there would be a charge - merry f'ing Christmas! 1 1 Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted December 20 Share Posted December 20 46 minutes ago, Tom said: I know. They said they could come back and do it but there would be a charge - merry f'ing Christmas! Might be worth reminding them that this is part of building regs for an MVHR, from memory 1 Link to comment Share on other sites More sharing options...
Redbeard Posted December 20 Share Posted December 20 On the positive side that really is a beautiful 'duct-forest'! Doesn't need boxing (not that I think you were going to); it's a sculpture! 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted Friday at 19:08 Share Posted Friday at 19:08 22 hours ago, Tom said: Many, many thanks for all the helpful advice. I've turned the humidity limit up to 85% and the the thing's as quiet as a mouse. I might have to go and check it's still on... Tres bien, Rodney. 21 hours ago, Tom said: Oh, and the installer said it wasn't their job to insulate the external feed duct, ffs. It's only a short run, guess I just need to wrap in rockwool? Yup, as above, the foiled stuff. Or neoprene sheet stuff and use carpet spray glue (contact adhesive) to bond. 8 hours ago, Tom said: I know. They said they could come back and do it but there would be a charge - merry f'ing Christmas! Penises. Link to comment Share on other sites More sharing options...
Nickfromwales Posted Friday at 19:11 Share Posted Friday at 19:11 3 hours ago, Redbeard said: On the positive side that really is a beautiful 'duct-forest'! Doesn't need boxing (not that I think you were going to); it's a sculpture! Has your wife caught you looking at @ducthub in the evenings? 1 Link to comment Share on other sites More sharing options...
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