Post and beam Posted March 7, 2023 Share Posted March 7, 2023 I believed the Ubbink 400 was a good choice for my prospective house design ( planning granted today !). 200 sq/m requiring 60 l/s, apparently. From the manual the 5 speed settings give the following # 0 = 50 m3/hr, 14 l/s # 1 = 100 m3/hr, 28 l/s # 2 =200 m3/hr, 55.5 l/s # 3 =300 m3/hr, 83 l/s #max = 400m3/hr, 111 '/s I have no way of knowing if the 5 speed settings are equally spaced from 0 to full. So, my 60 l/s would need speed set at 2. Does this look like it will be operating in a quiet enough part of its range to be a wise choice after all? Also, how does the boost requirement of 4 ACH fit into this model As always guys, wise words gratefully taken on board Link to comment Share on other sites More sharing options...
JohnMo Posted March 7, 2023 Share Posted March 7, 2023 5 minutes ago, Post and beam said: boost requirement of 4 ACH Where do you get this requirement from? Would normally be a boost of 125% if I recall correctly. Link to comment Share on other sites More sharing options...
jack Posted March 7, 2023 Share Posted March 7, 2023 23 minutes ago, Post and beam said: I believed the Ubbink 400 was a good choice for my prospective house design ( planning granted today !). 200 sq/m requiring 60 l/s, apparently. From the manual the 5 speed settings give the following # 0 = 50 m3/hr, 14 l/s # 1 = 100 m3/hr, 28 l/s # 2 =200 m3/hr, 55.5 l/s # 3 =300 m3/hr, 83 l/s #max = 400m3/hr, 111 '/s I have no way of knowing if the 5 speed settings are equally spaced from 0 to full. So, my 60 l/s would need speed set at 2. Does this look like it will be operating in a quiet enough part of its range to be a wise choice after all? Also, how does the boost requirement of 4 ACH fit into this model I have a Brink Excellent 400, which is in the same family of closely-related MVHR units. I have a ~290 m2 house with probably higher than average volume. I'll have to dig it out to be sure [which I've now done and corrected the following number], but I believe our calculated base rate was 180 225 m3/hr, which seems low compared to what you're aiming for given your floor area. Either way, I never run it on anything like that. I think it's currently set on 80 m3/hr, and stays like that 24/7 unless I manually boost it when cooking or we have a lot of people over. We never have problems with condensation and the bathrooms dry out fast enough that I don't bother with a humidity-based boost (I'd have set it up, but one of the decorators we had in decided to step on a cardboard box to reach something. It collapsed, which caused him to smash the humidity sensor that was in the box. I was only 80% sure it was him when I found it a couple of days later, so unfortunately I wasn't able to clearly place the blame). Can you adjust the rate away from those manual setting defaults? I believe we were able to do so for ours at a resolution of maybe 5 m3/hr. Link to comment Share on other sites More sharing options...
Post and beam Posted March 7, 2023 Author Share Posted March 7, 2023 16 minutes ago, JohnMo said: Where do you get this requirement from? Would normally be a boost of 125% if I recall correctly. It came from 1.27 of part F. However, having just re read it i think i misunderstood. Its been a long day. Purge ventilation rather than boost as i stated means opening the windows. 2 Link to comment Share on other sites More sharing options...
Post and beam Posted March 7, 2023 Author Share Posted March 7, 2023 10 minutes ago, jack said: I have a ~290 m2 house with probably higher than average volume. I'll have to dig it out to be sure, but I believe our calculated base rate was 180 m3/hr, which seems low compared to what you're aiming for given your floor area. The 60l/s figure comes from the quote i have from Regavent. also .3 x area which is 200 m3 in my case. As per another post i raised, with no other knowledge to base my figures on i have been using the 60 l/s. I have read such good things about the Brink/Ubink 400 that i would be amazed if it were not suitable and your comments bear that out. Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 7, 2023 Share Posted March 7, 2023 1 hour ago, jack said: Can you adjust the rate away from those manual setting defaults? I believe we were able to do so for ours at a resolution of maybe 5 m3/hr. Yup, on the Brink stuff, but a pretty generic function. 1 hour ago, Post and beam said: It came from 1.27 of part F. However, having just re read it i think i misunderstood. Its been a long day. Purge ventilation rather than boost as i stated means opening the windows. You were probably just giddy from the good news 1 hour ago, Post and beam said: Regavent 👎 Link to comment Share on other sites More sharing options...
Post and beam Posted March 8, 2023 Author Share Posted March 8, 2023 Hi Nick Agree no to Rega-vent. Their unit looks like rubbish when you see inside it. I had the joy of seeing one of their part finished installs recently as well. I could not commit to spending £7k on that. So i used that figure and priced up a kit of parts for a Brink 400 and 90mm ducting. That appears to come to about £5k. This would leave me £2k to get it commissioned and signed off and i would be no worse off financially but would have a top notch install. Link to comment Share on other sites More sharing options...
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