I've recently installed some TRV's on a few of my radiators, but when
the temperature is just below the shut off point they seem to start
whistleing! It seems to be on every radiator so it's not just a rouge
I fitted the Pegler Terrior II TRV's from Screwfix as I was told
Pegler was a reputable make. Could anyone shead any light onto why
this is happening and if there's a solution (apart from replacing them
On the bright side, it does negate the need for an alarm clock in the
On 5 Dec 2003 04:48:49 -0800, email@example.com (Big Phil) wrote:
Seriously though, have you balanced the system or are all the
lockshields wide open?
Otherwise you are asking the TRVs to do the entire flow control.
If the pump is on a high setting, creating high flow/pressure then the
valves could whistle as they are shutting off. Try reducing the
I'd recommend fitting an automatic bypass valve, or setting up the one you
already have. This can substantially reduce issues like this. Another
possibility, if you have a pump external to the boiler, is to replace by an
intelligent pump such as a Grundfos Alpha, that notices TRV shut down and
slows down automatically, rather than putting ever faster water through the
radiators still on, causing excessive noise.
Thanks for all these. I am planning on moving to a Combi System in the
very near future, the TRV's on some of the rads were the first phase
of this, so I'll see what it's like afterwards. In the meantime I'll
balance them a bit better as they are currently all fully open I
Thanks again, what a useful newsgroup this is.
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