Unvented CH system - need for 'safety' radiator?

[Cussy]

I've recently moved into a brand new 3 storey house. It has an unvented CH system with TRVs on all rads except the one in the hall. There is a room stat in the hall.

All rads are fully bled and TRVs correctly set but to get the top floor as warm as I want means the hall has to be allowed to get really warm or it triggers the roomstat. I'm needing to run the roomstat at 23 degrees.

I think the (non-TRV) hall rad is a tad too large and too close to the room stat but the installer/builder say it's correct so I'm snookered there.

Is there any reason why I cannot simply shut off the hall radiator at the valve and rely on each room's TRV for control? I seem to recall someone once saying that the new unvented systems need at least one radiator to be always open.

Many thanks.

 

[Deleted member 105431]

you need a bypass to allow the pump overrun of the boiler. That hallway rad also provides the heat to operate the roomstat. Leave it alone!

 

[jameshayes]

reduce heat output by turning down lockshield valve on hall rad.
as its a new build there is probaly a bypass valve some where on the system usually just after the pump.

 

[kirkgas]

if it is a new system it "should" have a fully automatic bypass valve which would allow the hall rad to have a trv and be shut down but as it has 2 lockshields i assume that it is being used as a bypass so i wouldn't shut the valves as it might stop correct circulation, better to try to balance the other rads first to see if that helps.