Hi,
Some of my radiators are not getting hot at all or some are just hot at the top and from one side.
System Description.
- Downstairs mostly Wet Under Floor Heating. 14 Flow Circuits, with 8 Room Stats / Zones - WORKING OK
1 Towel Rad fed from upstairs
- Upstairs - Radiator based, single zone valve. 12 Rads from 3 pairs of 4 port manifolds to 10mm plastic. + 5 Rads from 2 Pairs of 4 port manifolds to 10mm plastic (other ports capped off).
Current works
Over the past two weekends I have run the system with X800 and flushed I have been flushing the system throughout. I have disconnected and flushed every Rad at mains pressure. I replaced all the JG Speedfit 4 port manifolds for flow and return to the Rad10mm circuits). I have used a radiator vibrator on an SDS drill :38:, to remove any blockages and sludge. I have flushed every circuit and also the core CH pipework which starts with 22mm from boilers (2x Valliant Eco max) to 35mm down to UFH or Rads main 28mm, then 22mm to the Rad Manifold Ports (4 Port Jg Sppedfit), the 10mm to rads.
Yes, I have removed lots of crud and sludge, but have proven full flow ability through every Rad circuits and the feeds to the distribution manifolds.
I also run run a pair of Magnaclean 28mm Pro's in parallel on the main feed to the boilers. I.e. Piped in 35mm.
I'm thinking my Rad problems may be due to poor flow rates to some rads and have tried balancing but am unsure if this is the problem or perhaps the flow is being challenged by some other factor.
One thing in to note is that after of had completed the flushing and refilled / pressurised the system, initially every Rad went up to full heat so I thought I had cracked it, but over the next few hours as it settled down, some rads began to cool down. All TRV's were removed at that point and lockshields were initially fully open.
With my system the has high flow from the boilers but 10mm plastic to individual rads, should I even be trying to Balance via lockshield restriction or just relay on the TRVs doing their job and perhaps try turning some of the TRVs down for rooms that are producing more heat ?
Any thoughts ?
thx Bob
Some of my radiators are not getting hot at all or some are just hot at the top and from one side.
System Description.
- Downstairs mostly Wet Under Floor Heating. 14 Flow Circuits, with 8 Room Stats / Zones - WORKING OK
1 Towel Rad fed from upstairs
- Upstairs - Radiator based, single zone valve. 12 Rads from 3 pairs of 4 port manifolds to 10mm plastic. + 5 Rads from 2 Pairs of 4 port manifolds to 10mm plastic (other ports capped off).
Current works
Over the past two weekends I have run the system with X800 and flushed I have been flushing the system throughout. I have disconnected and flushed every Rad at mains pressure. I replaced all the JG Speedfit 4 port manifolds for flow and return to the Rad10mm circuits). I have used a radiator vibrator on an SDS drill :38:, to remove any blockages and sludge. I have flushed every circuit and also the core CH pipework which starts with 22mm from boilers (2x Valliant Eco max) to 35mm down to UFH or Rads main 28mm, then 22mm to the Rad Manifold Ports (4 Port Jg Sppedfit), the 10mm to rads.
Yes, I have removed lots of crud and sludge, but have proven full flow ability through every Rad circuits and the feeds to the distribution manifolds.
I also run run a pair of Magnaclean 28mm Pro's in parallel on the main feed to the boilers. I.e. Piped in 35mm.
I'm thinking my Rad problems may be due to poor flow rates to some rads and have tried balancing but am unsure if this is the problem or perhaps the flow is being challenged by some other factor.
One thing in to note is that after of had completed the flushing and refilled / pressurised the system, initially every Rad went up to full heat so I thought I had cracked it, but over the next few hours as it settled down, some rads began to cool down. All TRV's were removed at that point and lockshields were initially fully open.
With my system the has high flow from the boilers but 10mm plastic to individual rads, should I even be trying to Balance via lockshield restriction or just relay on the TRVs doing their job and perhaps try turning some of the TRVs down for rooms that are producing more heat ?
Any thoughts ?
thx Bob
Last edited: