Discuss Plumbing and Heating: DHW Secondary return configuration. in the Plumbing and Heating Forum area at TilersForums.com

uHeat Official Forum Sponsor for Underfloor Heating (Electric and Wet)
This official sponsor may provide discounts for members

Plumbing News

TF Official Sponsor
Premium
Joined
Dec 9, 2019
Messages
1,592
DHW Secondary return configuration. plumbing question
Hi

Anyone help and advise on the best option for a DHW secondary circulation (SC) layout.

Scenario 1

I need to install SC in a large new build. The unvented cylinder will be in the middle of the house and so I would like to have two SC ‘loops’ i.e. T off the hot from the cylinder and go to each end of the house. Then install 2 return legs and common them before a single pump as it returns into the cylinder. In this approach I anticipate having to add valve to balance each of the loops so the pump is pulling both legs equally and not favouring any particular loop.

90C281DB-1D25-4142-A30A-C8F707D22ABA.jpeg

Scenario 2

Can I have some outlets off the secondary return loops and some low use hot taps not? So, I would again T off the top of the cylinder and create a SC loop with one of the branches of that T and take the other branch take straight to a HW tap(s) without a return?

If this is possible, would I have to have a one way valve to the none SC leg to prevent the true SC loop pulling on it?

CB5B4686-5257-405E-B2CD-391F35E42AB1.jpeg

General question.

Is it still best practice to have the SC return leg a pipe size small than the supply leg?

If reducing the return pipe is the correct way, in scenario 1, would I do both returns in size lower or once they are commoned before the pump drop a size. I.e. say the out let pipework from the cylinder is in 22mm from the furthest point back drop to 15mm or stay in 22mm for the return legs and drop to 15 before the pump once commoned

Can spur off the SC loop and then spur off that spur again. I.e. T off the SC loop to feed the shower and the basin with only one pipe.

5395C927-4C68-44E3-A417-7BCD878F001F.jpeg


Many thanks.

DHW Secondary return configuration.

This has been posted to our plumbing forum, click DHW Secondary return configuration. to reply to this plumbing question.
 
UK Pro Tiling Training
This official sponsor may provide discounts for members

Reply to Plumbing and Heating: DHW Secondary return configuration. in the Plumbing and Heating Forum area at TilersForums.com

UK Pro Tiling Training
This official sponsor may provide discounts for members
Top Bottom
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock
No Thanks

Use TilersForums.com to find Tiling Jobs or your Local Tilers for free. Get tiling tools at the best prices via the forum.