On 2016-02-14, Roger Mills wrote:
On 14/02/2016 18:26, Justin C wrote:

I'd like to avoid calling the plumbers back if I can.

Last week we had two stuck-shut TRVs replaced, the new ones are
marked Bulldog gen2. We were looking forward to being warm again
but alas, twas not to be. I thought that maybe the rad needed
flushing, so did that myself yesterday - it did need doing but
didn't fix the issue.

I took the head off the TRV and the radiator was too hot to touch
within a few minutes - result! But then the TRV cut flow before
the room got up to a habitable temperature. I compared the head
with the other one they fitted and the plunger was much more
proud, I swapped them over (the other is in a room infrequently
used and we don't mind it being chilly). That'll do it I thought,
except no... within a short time the heat from the rad had
expanded the (whatever it that makes these work) and we were in
the same situation.

So, even at 'full-open' these TRVs cut flow before the room is
warm, we're constantly chilly. Can these be adjusted somehow (I
can't see it if they can - short of taking a dremel to the plunger
in the head). Or do I need to call the plumbers back in?

If I barely put the head on - so the fixing ring threads only just
grip - 1/8 to 1/4 turn - we have the kind of temperature we want,
but that's not right.

Suggestions gratefully received.



Justin.

It sounds as if these are the wrong heads for the TRVs. Were the whole
things replaced, or only the heads?

That sounds logical. I don't know if the TRV was replaced, or only the
head.

Yesterday we were fed up with being chilly so I took the head off the
TRV and before long we were too warm!

It sounds like I need the plumbers to come back.


Justin.

--
Justin C, by the sea.