hoping you may be able to help me with a problem on my vented heating system ...
to cut a long story short
i have relocated my hot water cylinder and pump in the attic (to liberate space on the landing ... airing cupboard)
in order to do this I have lifted both the storage tank and the central heating expansion tank about 1.5m in order to provide the necessary head on the hot water cylinder and keep the expansion tank above the pump ... maintaining a positive presuure throughout all the system.
the problem i have is that my system is continuously filling up with air, rads require bleeding and the system is noisy (assume it is the air)
i think i am drawing air in through the vent to the expansion tank when the pump starts ... the length of the vent pipe is less than it was originally and i do get overflow from the expanion tank which seems to coincide with the pump starting
i have overcome the problem by selecting a lower speed on the pump, unfortunately at a lower speed i do not seem to be able to balance the system such that all the rads heat up ... no matter how much i try.
currently in the 22mm vent line there is a simple air separator, vessel
i was wondering if anybody knows of anything on the market which i can put in the vent which will prevent air being drawn in.
i was looking at mechanical air vents/separators and backflow prevention products ...