New loft radiators cold: balance whole system?

[Coltom]

Ariston DIA system 27 RFFI combi plus hot water storage tank (plus immersion heater) - all installed into our two storey victorian terrace 1998ish. serviced recently by Ariston engineer and all OK.

Just had loft conversion inc new rad and HTR. Neither warm up when CH is on. Plumber who installed rads just told us to turn up the combi boiler thermostat. Now everything downstairs is too hot and hall thermostat cuts off. Reading here it seems as though the whole CH system might need to be properly balanced. Found the FAQ and could have a go but shouldn't plumber/loft company have done this?

 

[doitall]

The plumber installed it he should be the one to get it working as part of the project.

And just in case, it isn't chargable.

 

[East Kent Coastal]

Balancing may sort it, the new rads being the furthest, I'm assuming, from the boiler, therefore being starved of heat by the other rads. If you wanted to get it sorted without having to wait, balancing is in the FAQs.

However, it might also be how he run in the pipework for the rads. As a rule of thumb, 15mm pipework can only supply 2 average sized rads with sufficient flow to heat up properly. If he connected into 15mm pipework already feeding 2 or more rads, the new ones will have trouble getting hot. He would've wanted to have come off the closest 22mm pipework.

The new rads are at the top of system tho. I'm assuming you've tried bleeding them?

 

[doitall]

What is the pressure gauge reading.

 

[kevplumb]

where is the boiler ?

 

[Coltom]

Loft rad & HTR bled.
Boiler pressure 1.5 bar.
Boiler in kitchen (grd floor).

In pic -
source pipe from rad in 1st flr bathroom into which T-piece inserted is too hot to hold. New pipe T-pieced off this also too hot to hold. Pipe as it enters new rad in loft approx. 50C. Exit pipe from new rad cold.

Untitled

• Coltom
• 9 Dec 2012
• 1

 

[doitall]

Is the lockshield valve open

 

[Coltom]

Is the lockshield valve open

Yep

 

[doitall]

And you removed the cap and checked.

In that case, turn the flow lever valve off and see whether you can draw any air from the return.

 

[Servotech]

Might seem a daft question but have you vented it with the pump off?

 

[Coltom]

And you removed the cap and checked.

In that case, turn the flow lever valve off and see whether you can draw any air from the return.

Sorry don't understand

 

[Coltom]

Might seem a daft question but have you vented it with the pump off?

Aqain not sure what this means

Could the TRV be faulty?

 

[doitall]

And you removed the cap and checked.

In that case, turn the flow lever valve off and see whether you can draw any air from the return.

Sorry don't understand

In the pic you show lever ball valves where the existing pipes were valved off prior to the extension.

You could have an air lock in the return, so turning the flow valve off you can bleed the rad from the return pipe.

 

[Agile]

Do you get water out of the loft rad bleed screw?

 

[dcawkwell]

Turn radiators downstairs off and the upstairs will get hot.
Simply system needs balancing.

Turn radiator thermostat up indeed. idiot doesn't know what he is doing.