Still getting to grips with the flow numbers Ubbink 400

[Post and beam]

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

[JohnMo]

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.

[jack]

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.

[Post and beam]

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.

[Post and beam]

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.

[Nickfromwales]

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

👎

[Post and beam]

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.