I have 2 cold rads on my system. I replaced 3 rads with type 22 convectors with thermostatic valves and of course, I had to drain down. My system was originally a gravity type fed by a Rayburn, then upgraded to a back boiler with a pump added. No TRV's As far as I can tell, it is a single pipe system. The 2 cold rads are fed from a single pipe. The way the system worked before was water went to a downstairs rad at the back of the living room, then to a kitchen rad, then to the hall rad then upstairs to a bathroom rad. Bathroom and hall rads heat up but kitchen rad and living room rad stay cold. I suspected an airlock and drained water from the kitchen rad. There was air in the pipes, the 2 cold rads heated up and I thought my problem was solved. But apparently, only till I switched everything off. Next day, same problem.
Assuming the problem is an airlock. I have been told that I can connect a hose to the drain cock and blast any air in the system up to the expansion tank in the loft. Is this a safe procedure?
Or has my problem been caused by me adding the TRV's? Any advice appreciated.
Assuming the problem is an airlock. I have been told that I can connect a hose to the drain cock and blast any air in the system up to the expansion tank in the loft. Is this a safe procedure?
Or has my problem been caused by me adding the TRV's? Any advice appreciated.