Hi
Thinking of replacing all the radiator valves in the (3 bed semi) house, due to tops missing etc.
Obviously worth using some TRVs, but is it worth using them on all the radiators?
Does it matter which end of the rad they go?
All but the one where the room thermostat is located
If they are bidirectional types, no. Usually these have a mark with an arrow having two heads on the base. If it is one head then the valve is directional and needs to be fitted accordingly.
It's worth investing in Drayton/Invensys TRV4s for longevity and inhibitor after the surgery of course.
Make sure you leave one radiator without a TRV. Your boiler requires this to be done. Calum Sabey (Newark Traditional Kitchens 01556 690544)
hi
only use honeywell vt117e trvs--you will not regret most othes stick leak or pack up
one rad has to have no trv --the one in same room as the room stat to comply with building regs vt117e u can can put on the flow or return ((either end))
The Medway Handyman wrote:
Well, sort of . . .
If the boiler requires pump over-run, there must always be a flow path. If this is provided by a radiator, then:
The *real* reason for having a radiator without a TRV is that there needs to be a room stat to provide a boiler interlock (i.e. turn the boiler off when all demands are satisfied). The room stat must be in a room with an open radiator. If there were a TRV, the 2 stats would fight with each other - with unpredictable results.
Or fit a by-pass to the system. (ISTR that some boilers incorporate this facility)
Malcolm
Whenever I read this it always conjures up bizarre images in my mind of heating components coming to life after everyone's gone to bed and wrestling on the axminster.
I found with the Pegler ones that screwfix do, they will work fine on either side of the rad, however if you put them on the return side, you can sometimes get an irritating whistling sound from them as they throttle down.
Oh yeah, been there. It's an incredibly annoying sound, especially if you fit one in the bedroom. Pegler were very nice about it, but still insisted that their TRVs can be fitter either way round.
What is the corrrect arrangement with a thermal store?
Does the boiler just thermostat off the store?
And all rads then have TRV's and no room stat is needed?
Anyone got a link to design advice on thermal store based central heating?
I think it better to fit a programmable thermostat in the sitting/living room and use that to vary the temperature of the whole house over the 24 hr day, with perhaps a different setting for weekends.
Any TRV will counteract the programmable thermostat since it will be trying to maintain a constant temperature.
I did notice the BBC Newsnight 'Ethical Man' decided that having 6 TRVs installed for £300 was not worth the money as it would only save about £25 pa, especially after an estate agent told him that upgrading is house from a 'D' rating to a 'C' rating would make no difference to the selling price. The plumber did point out that the radiators had conventional valves which could be manually) turned if necessary.
"Michael Chare" wrote
NO!
The stat will only directly control the temperature in the living room and switch off the system when that room is satisfied. TRVs are used to control what happens in all the other rooms! When you have TRVs in conjunction with a programmable stat, the stat acts as a sophisticated time clock for the rest of the system until it is satisfied. Once the set point for the living room is reached and the stat satisfied it turns the heating circuit off.
Phil
Yes, but they will try to maintain a constant temperature, If you use normal radiator valves in a fixed position the temperature in the other rooms will rise and fall with the temperature in the living room.
When the room termperature is near the set point my programmer runs the boiler at regular intervals e.g. on for two minutes off for five
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