B
bigrinks
Hi all, first posting so please be gentle!
I've got a ideal classic boiler and a megaflow tank sealed / unvented system. approximatley 10 years old and serviced regularly.
Even from new the system has been very poor at heating my livingroom radiators which struggle to get above 33 degrees C with system on. On radiator( the furthest doesnt heat up at all). Flow in hot, flow return cold and in some radiators - stone cold.
General view is that i have a blockage in downstairs loop (unlikely) or that system incorrectly installed (likely). Having investigated the latter, i now know the system is 22mm arterial copper feed with flow and return being15mm branches to each radiator. However, my downstatirs circuit consists of very short 22mm feed and return and majority being 15mm and feeding multiple radiators - and very long lengths!
I've since drained and piped in 22mm connection from exisitng 22mm direct into the rooms with poorly operating radiators. This reduces length of 15mm branches and provides a feed for multiple radiators.
Now systems running, i can report very little change in rad temps (still 33 deg C) although the cold ones all now get to 33 DC quickly. With air temp set high, boiler cuts out repeatadly due to overheating before restarting a few mintues later. Balancing therefore usless as it seems to make a constrained system worse.
Any ideas what to look at next? How to track down the problem.
This problem seems to be of little interst to professionals and i've been given the run around since October - presumably due to difficulty?
Sorry for length of the post!!!
Mark
I've got a ideal classic boiler and a megaflow tank sealed / unvented system. approximatley 10 years old and serviced regularly.
Even from new the system has been very poor at heating my livingroom radiators which struggle to get above 33 degrees C with system on. On radiator( the furthest doesnt heat up at all). Flow in hot, flow return cold and in some radiators - stone cold.
General view is that i have a blockage in downstairs loop (unlikely) or that system incorrectly installed (likely). Having investigated the latter, i now know the system is 22mm arterial copper feed with flow and return being15mm branches to each radiator. However, my downstatirs circuit consists of very short 22mm feed and return and majority being 15mm and feeding multiple radiators - and very long lengths!
I've since drained and piped in 22mm connection from exisitng 22mm direct into the rooms with poorly operating radiators. This reduces length of 15mm branches and provides a feed for multiple radiators.
Now systems running, i can report very little change in rad temps (still 33 deg C) although the cold ones all now get to 33 DC quickly. With air temp set high, boiler cuts out repeatadly due to overheating before restarting a few mintues later. Balancing therefore usless as it seems to make a constrained system worse.
Any ideas what to look at next? How to track down the problem.
This problem seems to be of little interst to professionals and i've been given the run around since October - presumably due to difficulty?
Sorry for length of the post!!!
Mark