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.

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?
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.

..

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

I agree with the previous suggestion - another is that the adjusting head
may have been removed and refitted on the wrong "start" of the multi start
screw thread. Usually a stop prevents this - but if the stop is removed
then it is possible to take the cap off. I did this once and had a devil of
a jog getting it to respond properly to "3" on the dial.

On Sunday, 14 February 2016 18:38:04 UTC, 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.

That is the problem with TRVs.
They are influenced by the radiator/nearby pipework as much/more than the room temperature.
It's why some are installed horizontally. (To get the head further away from the radiator)
Or sometimes even in outlet (cooler part) of the radiator/pipes)

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.

On 15/02/2016 07:45, harry wrote:
On Sunday, 14 February 2016 18:38:04 UTC, 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.

That is the problem with TRVs.
They are influenced by the radiator/nearby pipework as much/more than the room temperature.
It's why some are installed horizontally. (To get the head further away from the radiator)
Or sometimes even in outlet (cooler part) of the radiator/pipes)


TRVs do have their limitations - but there's something definitely wrong
in the OP's case. I suspect that the heads are the wrong ones for the
valves.
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.

On Monday, February 15, 2016 at 7:45:04 AM UTC, harry wrote:
On Sunday, 14 February 2016 18:38:04 UTC, 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.

That is the problem with TRVs.
They are influenced by the radiator/nearby pipework as much/more than the room temperature.
It's why some are installed horizontally. (To get the head further away from the radiator)
Or sometimes even in outlet (cooler part) of the radiator/pipes)


You can get TRVs with a small 'linking pipe'. You mount the sensor-head on the wall slightly remote from the radiator.

Robert

In article ,
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.

Possibly a stuck or sticking pin see:
http://www.ebuild.co.uk/topic/10634-trv-problem/
for possible solutions (that person had one sticking open) - Including
WD40 and gently wiggling the pin.

Alan

--


Using an ARMX6

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?

I mentioned your suggestion to my wife, she says she is sure they are
new TRV because one was seized, and rust coloured, the replacements are
shiny and new looking.

Justin.

On 2016-02-15, Alan Dawes wrote:
In article ,
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.

Possibly a stuck or sticking pin see:
http://www.ebuild.co.uk/topic/10634-trv-problem/
for possible solutions (that person had one sticking open) - Including
WD40 and gently wiggling the pin.

Nothing wrong with the pin, I take the head off the TRV and it's like
an oven in here.

Justin.

Has the knob been removed and then screwed down too far before the stop was
fitted? (which limits it to one turn)

On 2016-02-15, DerbyBorn wrote:
Has the knob been removed and then screwed down too far before the stop was
fitted? (which limits it to one turn)


While the head removes easily, it does not appear to come apart in a
non-destructive way, I have looked very closly.

As I mentioned in my first post, if I only just engage the threads of
the head onto the body of the valve it works OK, but as I start "doing
up" the nut (knurled ring) the head is pulled down and flow reduced.
Then, as everything gets warm (TRV head in proximity of rad) flow is
shut off but before the room is warm enough.

While I could leave the head only partly engaged with the threads, I
I don't like that idea, all it would take is someone who doesn't know
to give it a tweak and they've got a TRV in their hands!


Justin.

--
Justin C, by the sea.

Justin C wrote in
news
On 2016-02-15, DerbyBorn wrote:
Has the knob been removed and then screwed down too far before the
stop was fitted? (which limits it to one turn)


While the head removes easily, it does not appear to come apart in a
non-destructive way, I have looked very closly.

As I mentioned in my first post, if I only just engage the threads of
the head onto the body of the valve it works OK, but as I start "doing
up" the nut (knurled ring) the head is pulled down and flow reduced.
Then, as everything gets warm (TRV head in proximity of rad) flow is
shut off but before the room is warm enough.

While I could leave the head only partly engaged with the threads, I
I don't like that idea, all it would take is someone who doesn't know
to give it a tweak and they've got a TRV in their hands!


Justin.


Mine have removable limit stops - which if removed allow the knob to
make an extra turn.