Recent content by ronp849

Retired.

Retired Electronics Engineer

Many moons ago I had to design a demagnetiser for ball races - It consisted of generating a 50Hz alternating magnetic field strong enough to overcome the residual magnetisation of any component to be demagnetised. The field was then allowed to decay slowly over several mains cycles to zero. In...

Hi -I had a similar problem with a RavenHeat Combi. (Mind you, It had been running for about 15years). The Central heating/Hot water was working fine but it would not hold pressure. Kept on discharging through the boiler pressure release valve. It turned out to be the Expansion chamber...