Hi all

Just had an upgrade to the CH and found that the wallys have reversed the
flow and return to the downstairs rads.
That is the hot water flows from the lockshield end to the TRV end of each
rad.
The only downside that I can see to this is that any sludge build up (which
has been sitting happily out of harms way not bothering anyone), may be
dislodged by the reverse flow and cause blockages. The system was hit with
Sentinel X400 twice by yours truly before the re-work, but some areas were
still noticably clogged.

I believe that the TRVs can work in either direction, mostly Draytons and a
couple of Danfoss.

So, any good reasons to insist on the re-piping would be appreciated!!!
Doesn't look like a huge exercise but will involve drain down and re-fill
with inhibitor.

TIA

Phil

TheScullster wrote:
Hi all

Just had an upgrade to the CH and found that the wallys have reversed the
flow and return to the downstairs rads.
That is the hot water flows from the lockshield end to the TRV end of each
rad.
The only downside that I can see to this is that any sludge build up (which
has been sitting happily out of harms way not bothering anyone), may be
dislodged by the reverse flow and cause blockages. The system was hit with
Sentinel X400 twice by yours truly before the re-work, but some areas were
still noticably clogged.

I believe that the TRVs can work in either direction, mostly Draytons and a
couple of Danfoss.

So, any good reasons to insist on the re-piping would be appreciated!!!
Doesn't look like a huge exercise but will involve drain down and re-fill
with inhibitor.

TIA

Phil

Some TRVs get a bit noisy when the water flow is the "wrong" way, and
clunk when the valves operate. If they are designed with no particular
flow direction required then I guess this shouldn't be a problem.

On Tue, 26 Sep 2006 09:16:58 +0100, TheScullster wrote:

Hi all

Just had an upgrade to the CH and found that the wallys have reversed the
flow and return to the downstairs rads.
That is the hot water flows from the lockshield end to the TRV end of each
rad.
The only downside that I can see to this is that any sludge build up (which
has been sitting happily out of harms way not bothering anyone), may be
dislodged by the reverse flow and cause blockages. The system was hit with
Sentinel X400 twice by yours truly before the re-work, but some areas were
still noticably clogged.

I believe that the TRVs can work in either direction, mostly Draytons and a
couple of Danfoss.

So, any good reasons to insist on the re-piping would be appreciated!!!
Doesn't look like a huge exercise but will involve drain down and re-fill
with inhibitor.

If the TV are truly bi-directional then there is no problem.
Sludge should have been thoroughly removed as part of the upgrade.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

On Tue, 26 Sep 2006 09:16:58 +0100, "TheScullster"
wrote:

I believe that the TRVs can work in either direction, mostly Draytons and a
couple of Danfoss.

Older Drayton's were one way only, they changed iirc about 3 or 4
years ago to bi-directional. There should be an arrow marking on the
valve body.


--