Hi folks
About 2 months ago I replaced my parents heating system up to but not including the boiler. Basically, plumber came in fitted combi to old system then I came in and ripped out all the old rads and pipework. Anyway, piped system up using 22mm flow to a 22x15x15x15 manifold. one 15mm for new extension (3 rads), one 15mm for remainder of downstairs (3 rads) and one for upstairs (3 rads and a dinky small towel rad) The return is done the same way. I've used Hep2o and have used the inserts.
Problem I have is pressure stays bang on 1 bar but over the course of a couple weeks all the upstairs rads get air in them. One of them gets about 90% air, the other maybe 30% air and the towel rad about 20% air.
One section of old copper remains on the upstairs section as it wasn't convenient to do at the time. this consists of old 22mm flow and ret, old system pump etc. I will on holidays rip up bedroom floor and get rid of all this so it will be 100% Hep2o. Could air be getting sucked in at a bad connection on the old copper? seems strange as pressure stays the same.
Any ideas of what to check would be appreciated.
Steve
About 2 months ago I replaced my parents heating system up to but not including the boiler. Basically, plumber came in fitted combi to old system then I came in and ripped out all the old rads and pipework. Anyway, piped system up using 22mm flow to a 22x15x15x15 manifold. one 15mm for new extension (3 rads), one 15mm for remainder of downstairs (3 rads) and one for upstairs (3 rads and a dinky small towel rad) The return is done the same way. I've used Hep2o and have used the inserts.
Problem I have is pressure stays bang on 1 bar but over the course of a couple weeks all the upstairs rads get air in them. One of them gets about 90% air, the other maybe 30% air and the towel rad about 20% air.
One section of old copper remains on the upstairs section as it wasn't convenient to do at the time. this consists of old 22mm flow and ret, old system pump etc. I will on holidays rip up bedroom floor and get rid of all this so it will be 100% Hep2o. Could air be getting sucked in at a bad connection on the old copper? seems strange as pressure stays the same.
Any ideas of what to check would be appreciated.
Steve