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Just a shame our RT313's don't have the balancing insert - but the Honeywell Valencias upstairs do. Oh well.

Drayton RT313's on the downstairs. I'll try that suggestion of 1/12.

Yes we have an auto bypass valve. As for February last year - that guy turned out to be a bit dim shall we say since the automatic bypass was setup for a 2 meter head and hence fully open most of the time. We got somebody else who set up the system properly. All radiators now get piping hot...

I'll Give that another go. I have tried that before but although the differential across the boiler flow and return was approx 18-20 degrees for the first 15 minutes of heating being on, afterwards the return begins to climb as the TRV's close down, right up until the point that there is only...

D_Hallisham - it's a British Gas 330 (glow worm) on an S plan. Sealed system.

System pressure is 1.0 bar when ambient, rising to about 1.4 bar when up to the flow setpoint of 72. The circulating pump is fitted after the boiler (1.5 meter in terms of length of pipework) in the flow primary and before the three two port valves for the three zones I have. The radiator in...

Yes it does indeed. By the time the system has been fully heated through and up to temp it quietens right down.

Sealed system , all bled. Fernox inhibitor inside. A recent drain down revealed water practically as clean as tap water coming out and a very clean magnetic filter.

The TRV's are Drayton RT313 so multi directional.

It's always been like it since I balanced the system (previously the LSV was practically fully open and so a lot of flow going through the first radiator on the system) The LSV is on the flow pipe on this radiator as the TRV had been fitted to the return before our ownership of the house...

It's a about 20 years old that radiator but the valve is only a few years old. So I take it this is something we have to live with until we change the rad?

Any ideas why my systems first radiator LSV creates this noise when it's opened between 1/8 & 1/2 of a turn? I need to have it turned down this low to prevent it taking all the flow from the rest of the system but it starts making this noise. More than half a turn open and it stops.

In answer to these: No not really, it still Short cycles roughly the same amount with the boiler stat on maximum. Yes, I have several sets of clamp on thermometers and hand held PT100 contact probes which confirm the flow and return temps.

If the heating is on at the same time, no it doesn't short cycle at all, and the cylinder stat will still be satisfied but it does take a little longer to get there than solely hot water. Around 1 hour to 1 hour 15 depending on how cold the cylinder is to start with

Sounds about right to be honest and confirms kind of what I was starting to think. I bet the coil in that old cylinder is only 5 or 6kw on a 24 kw boiler.

Not really classed as a hard water area but the cylinder is pushing 40. The whole reheat process only takes about 45 minutes from cold, it's just that last 15 minutes or so where it does this.

It's already on three. The heating works fine it's just got water and when it gets towards 60 degrees on the cylinder temp

No you're right, I'm talking about industrial machinery in industry. (With reference to the original nature of this post)

It's In my safe isolation handbook written by the HSE and also in their own online archive : Isolation and permits to work Isolation The basic rules, are that there should be isolation from the power source (usually, but not exclusively, electrical energy), the isolator should be locked in...

Joking aside though, the HsE clearly define what they consider as acceptable in terms of isolation and the "no lockout" option isn't one of them under any circumstance.