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 Post subject: Condensing boilers, & "Ballon" wastes, etc
PostPosted: Sat Jan 01, 2011 12:19 pm 
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Location: Was Plouasne 22830, now Ploeuc sur Lie 22150, France
Condensing boilers, French hot water cylinders (Ballon), UK style pressurised hot water cylinders, and safety discharge pipes from pressurised central heating systems, discharge wastes

Whilst it might be a bit late for this years cold spell, it would be worth bearing in mind the problems brought to light because of this cold snap

A condensing boiler condenses part of the water vapour in the flue gas to liquid water and this liquid is piped to a discharge point via a 22 mm plastic waste pipe, if this pipe is run on an outside wall in an exposed position, the dribbles of water tend to freeze in the pipe, blocking it and the liquid will then back up the pipe resulting in a boiler shut down

Ballons, when the water is heated a small amount of water is discharged to waste, whilst the pipe is larger 32 mm plastic, if the pipe is exposed there could be a possibility of the water in the pipe freezing and blocking the pipe causing a flood inside the property

With UK style hot water cylinders and pressurised central heating systems, if the safety valve is dribbling water to waste, again the pipework could freeze, and cause a problem if the safety valve lifted for any reason

To avoid any problems, the best solution is to run the discharge waste pipe in a heated part of the property, lagging the pipe will help to a certain extent, changing the pipe size to the next larger pipe size could help as well, if the pipework must run on an outside wall in an exposed position changing the pipework to a metal pipe, with electrical trace heating and covered with lagging is about the only answer to a freeze up of the discharge pipe

Three meat and one veg

An old wild fowling motto : little powder, plenty lead, kill 'em dead

English born, Living in France, Therefore European

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