Ideal Mexico RS60 boiler, with gravity hot water.
On C/H pump start-up, a surge of water goes up both the feed and expansion pipe into the header tank, and also up the safety vent pipe at the same time (but no water actually comes out of the vent). Around half a pint up each pipe every time the pump starts.
As the hot water system is not connected to the pump (the pipes are on the opposite side of the boiler from the C/H pipes) what could be the cause of this?
The feed and expansion pipe is connected to the gravity hot water return, the safety vent is connected to the hot water flow.
The C/H pump is on the return pipe, just before it re-enters the boiler.
I'm getting air (not hydrogen) building up in the C/H radiators, so could the pump be sucking air in by so-called 'microleaks' or could it be aeration due to oxygenated water re-entering the system?
A professional heating engineer says teeing the f&e and vent pipes and blocking the vent may cure the problem, but why? (He didn't say.....)
On C/H pump start-up, a surge of water goes up both the feed and expansion pipe into the header tank, and also up the safety vent pipe at the same time (but no water actually comes out of the vent). Around half a pint up each pipe every time the pump starts.
As the hot water system is not connected to the pump (the pipes are on the opposite side of the boiler from the C/H pipes) what could be the cause of this?
The feed and expansion pipe is connected to the gravity hot water return, the safety vent is connected to the hot water flow.
The C/H pump is on the return pipe, just before it re-enters the boiler.
I'm getting air (not hydrogen) building up in the C/H radiators, so could the pump be sucking air in by so-called 'microleaks' or could it be aeration due to oxygenated water re-entering the system?
A professional heating engineer says teeing the f&e and vent pipes and blocking the vent may cure the problem, but why? (He didn't say.....)