andy

Plumbing Schematic

Recommended Posts

Hi all

 

So things move glacially along here.  Perhaps we'll actually get the ground works started in July but I am not holding my breath as it was (theoretically) supposed to have been December...

 

But whilst we wait, I've been busying myself with plumbing design, trying to work out what the best option is here and I've come up with the attached so far:

 

1248726986_Plumbing-Details.thumb.jpg.83cc719eb36be33de229a24bc5fcea41.jpg

 

I'm quite sure there are numerous things I need to add/remove/correct in it but what I wanted to try and get to was a design that made sense, so I can get a plumber to get me up to AHSP/hot and cold manifold level, so I can do the Hep2O runs to each room as needed.

 

I like @JSHarris idea of having a continually circulating UFH pump but I'm going to have two pumps and linked to this I am also not sure whether to do a single zone per manifold or split them up into zones per room.  I think continuous circulation is only sensible if you have a single zone.

 

Again, conscious of following the KISS principal and how far I seem to be deviating from it on this design so far...!

 

My plans for the control system is Loxone but I will need to ensure I have the correct inputs into that e.g. use Loxone switches per room as thermostats to request heating (again makes more sense to have multiple zones then).  Or do I just nominate two Loxone switches, one for each manifold and get that to run as required?

 

The house isn't up to passive levels mainly due to the stretched out shape of it but it isn't too far off with 300mm EPS100 on top of beam and block floor and 300mm warmcell filled timber frame walls, 350mm warmcell filled roof.

 

Anyone have any thoughts/corrections on the above?

 

I am also happy to upload the Visio that sits behind this if that is of use to anyone?

  • Like 1

Share this post


Link to post
Share on other sites

First comment, your UVC expansion vessel wants to be connected directly to it, not the other side of a service valve

 

I only have one circulating pump for the whole ASHP in the flow from the ASHP, that serves HW and heating. the UFH manifolds have their own circulation pumps.

 

Automatic bypass between ASHP flow and return as far away as you can get it from the ASHP before any electrical controlled valves.

Share this post


Link to post
Share on other sites

Thanks @ProDave, I've update the expansion vessel location.

 

I didn't know if a separate pump was required in addition to the manifold pumps but I've added one on the return.

 

I did have an automatic bypass between the ASHP flow and return but wasn't 100% sure if it was needed and where it needs to go.  At present I've got 3 valves - one for each UFH manifold and one for DHW, I could have a single one that diverted between DHW and UFH I guess but that would serve both manifolds?

Share this post


Link to post
Share on other sites
3 hours ago, andy said:

Thanks @ProDave, I've update the expansion vessel location.

 

I didn't know if a separate pump was required in addition to the manifold pumps but I've added one on the return.

 

I did have an automatic bypass between the ASHP flow and return but wasn't 100% sure if it was needed and where it needs to go.  At present I've got 3 valves - one for each UFH manifold and one for DHW, I could have a single one that diverted between DHW and UFH I guess but that would serve both manifolds?

3 port valves imho are the work of the devil. Stick to 2 port valves.

 

My own HP has a "feature" that it turns the pumps on all by itself if it senses the water in the HP is getting near freezing. If I didn't have a bypass, then all the flow valves would be shut and it would have nowhere to circulate.  Place the bypass at whatever point it furthest from the HP.

Share this post


Link to post
Share on other sites

If your house is stretched out and groundfloor only, maybe you would benefit from a hot return circuit to minimise wait times for hot water.

 

Could be well controlled by Loxone eg only running the hot return circuit pump when activity in the house is detected.

Share this post


Link to post
Share on other sites
9 hours ago, andy said:

Hi all

 

So things move glacially along here.  Perhaps we'll actually get the ground works started in July but I am not holding my breath as it was (theoretically) supposed to have been December...

 

But whilst we wait, I've been busying myself with plumbing design, trying to work out what the best option is here and I've come up with the attached so far:

 

1248726986_Plumbing-Details.thumb.jpg.83cc719eb36be33de229a24bc5fcea41.jpg

 

I'm quite sure there are numerous things I need to add/remove/correct in it but what I wanted to try and get to was a design that made sense, so I can get a plumber to get me up to AHSP/hot and cold manifold level, so I can do the Hep2O runs to each room as needed.

 

I like @JSHarris idea of having a continually circulating UFH pump but I'm going to have two pumps and linked to this I am also not sure whether to do a single zone per manifold or split them up into zones per room.  I think continuous circulation is only sensible if you have a single zone.

 

Again, conscious of following the KISS principal and how far I seem to be deviating from it on this design so far...!

 

My plans for the control system is Loxone but I will need to ensure I have the correct inputs into that e.g. use Loxone switches per room as thermostats to request heating (again makes more sense to have multiple zones then).  Or do I just nominate two Loxone switches, one for each manifold and get that to run as required?

 

The house isn't up to passive levels mainly due to the stretched out shape of it but it isn't too far off with 300mm EPS100 on top of beam and block floor and 300mm warmcell filled timber frame walls, 350mm warmcell filled roof.

 

Anyone have any thoughts/corrections on the above?

 

I am also happy to upload the Visio that sits behind this if that is of use to anyone?

 

Wildly in general it would be great to have such a set of resources once they are a little 'community approved' ;)

 

Share this post


Link to post
Share on other sites

I'm happy to upload the Visio but I'd like to iron out any obvious flaws that exist first.

 

@Nickfromwales any thoughts if you have 5 mins?

  • Like 1

Share this post


Link to post
Share on other sites
On 13/05/2019 at 11:24, andy said:

I'm happy to upload the Visio but I'd like to iron out any obvious flaws that exist first.

 

@Nickfromwales any thoughts if you have 5 mins?

Apologies, but only seeing this now.

I'll have a look when i get 5 mins, but at first glance it seems a little pointless going for such a small accumulator. That will have <125L of useful volume and is dependant on the incoming cold mains value. Have you done a reading for static pressure and dynamic flow rate yet? To decide on an accumulator volume these need to be known, and your max cold mains dependency understood. ;) 

Share this post


Link to post
Share on other sites

Hi @Nickfromwales no problem at all!!

 

Pressure was tested but only once so far and it’s 5.5 bar and circa 20l/min flow rate.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now