Recently done a powerflush on a sealed system S plan with 12 cast iron rads and 6 steel rads. Also fitted a Magnaclean at the same time. Most of the pipework is 22mm with 15mm to the steel rads.
Prior to the powerflush, the system was reasonably well balanced to my knowledge but some of the rads not fully up to temperature due to sludge.
Now the powerflush has been done, I'm finding it hard to rebalance the system. All the rads are bled and there is no noise indicating air in the system. Of the rads working, the valves need barely a half turn on for them to be boiling hot. A couple though won't heat up despite valves being fully open.
The cast iron rads have the flow in at the top (wheelhead valve) and out at the bottom (Lockshield). Should I use the wheelhead to balance or the lockshield or both given that they are very sensitive to adjustment?
If using the lockshield (bottom valve), would the rad be more prone to sludging up quicker at the bottom since the flow is restricted at the bottom rather than the top?
Prior to the powerflush, the system was reasonably well balanced to my knowledge but some of the rads not fully up to temperature due to sludge.
Now the powerflush has been done, I'm finding it hard to rebalance the system. All the rads are bled and there is no noise indicating air in the system. Of the rads working, the valves need barely a half turn on for them to be boiling hot. A couple though won't heat up despite valves being fully open.
The cast iron rads have the flow in at the top (wheelhead valve) and out at the bottom (Lockshield). Should I use the wheelhead to balance or the lockshield or both given that they are very sensitive to adjustment?
If using the lockshield (bottom valve), would the rad be more prone to sludging up quicker at the bottom since the flow is restricted at the bottom rather than the top?