Getting a little frustrated with my CH system.
Symptom - poor circulation, difficult to balance. 16 Rads, 3 Towel Rails. boiler on top floor. Large property (converted church). Mix of Cast iron rads and modern. Magnaclean fitted.
System is reasonably clean - only about 3 years old, and I've drained system 3 times, and flushed two suspect radiators, replumbed to simplify twists and turns to them. Have fitted new Drayton TRVs on all rads throughout. Replaced 2 undersized old rads with new.
Can now get all rads hot, individually. House is over 3 floors, and lots of the runs drop to the rads, which makes draining a bit of a sod.
If all lockshields are wide open, only about 3 or 4 rads get hot upstairs. To get any flow downstairs or to the cold rads, I have to almost close many of the other lockshields - down to .125 of a turn of 5 turns say. Even then, some parts of the circuit won't heat until I've refitted all the TRV heads (thus shutting down some rads completely).
Questions - could it be a dodgy pump (inside Vokera Linea 36HE) (it makes the right noises at the different speeds, and I can hear it pumping water). Or is it typical on a large circuit, to have to shut down so many of the lockshields down so far?
The system seems to be clean and sludge free now (there wasn't much muck in it and apart from the 2 problem rads, all the rads seem to be clean and heat properly top to bottom when isolated).
If the pump, is it ok to just buy the pump head, or do I need the whole unit?
Simon
Symptom - poor circulation, difficult to balance. 16 Rads, 3 Towel Rails. boiler on top floor. Large property (converted church). Mix of Cast iron rads and modern. Magnaclean fitted.
System is reasonably clean - only about 3 years old, and I've drained system 3 times, and flushed two suspect radiators, replumbed to simplify twists and turns to them. Have fitted new Drayton TRVs on all rads throughout. Replaced 2 undersized old rads with new.
Can now get all rads hot, individually. House is over 3 floors, and lots of the runs drop to the rads, which makes draining a bit of a sod.
If all lockshields are wide open, only about 3 or 4 rads get hot upstairs. To get any flow downstairs or to the cold rads, I have to almost close many of the other lockshields - down to .125 of a turn of 5 turns say. Even then, some parts of the circuit won't heat until I've refitted all the TRV heads (thus shutting down some rads completely).
Questions - could it be a dodgy pump (inside Vokera Linea 36HE) (it makes the right noises at the different speeds, and I can hear it pumping water). Or is it typical on a large circuit, to have to shut down so many of the lockshields down so far?
The system seems to be clean and sludge free now (there wasn't much muck in it and apart from the 2 problem rads, all the rads seem to be clean and heat properly top to bottom when isolated).
If the pump, is it ok to just buy the pump head, or do I need the whole unit?
Simon