In message , John
Rumm writes
On 18/07/2019 13:04, John Rumm wrote:
On 18/07/2019 11:31, Steve Jones wrote:
On Thursday, 18 July 2019 00:24:01 UTC+1, John Rumm* wrote:
On 17/07/2019 15:11, Harry Bloomfield wrote:
on 17/07/2019, John Rumm supposed :
Turn off the boiler. Top up the pressure to ~1 bar if required.
Isolate the CH flow and return. Now remove and empty the condensate
trap[1], and replace. Leave for an hour or two and see if pressure has
dropped. Check the condensate trap again. If there is a leak in the
main HX, then there will be water in there (you may even see an
occasional drip from the trap mounting point.

Isolator valves don't usually completely isolate, they will still pass
some water.

It does not really matter - if you empty the trap and the boiler is not
running, it should stay empty.

Thanks, will try trap test this weekend
If you do the test and the trap does not refill, remember to refill
it manually, since its not good to run the boiler with an empty trap
since there is a slight risk it could allow combustion products back
into the room via the empty trap.

Finally got round to fixing mine:

http://wiki.diyfaq.org.uk/index.php/...lus_624_repair

Very good.

The pressure loss I was flacking about in a self installed underfloor
heating system (professionally installed boiler and manifolds) turned
out to be two leaks at the manifolds.
One was a cracked air release valve, probably due to rough handling the
other a poorly fitted 22mm olive.
Not apparent until the system was allowed to cool when the drips were
obvious. Leak rate around 2 egg cups per day.



--
Tim Lamb