From the United States of America? - Checkout our specific plumbing forum for you:USA Plumbing Forum

Discuss How can I cure my gravity circulation problem? in the Central Heating Forum area at PlumbersForums.net

I am a retired Chartered Electrical Engineer and am looking for information about the necessary conditions for gravity primary circulation in a 28mm domestic indirect vented hot water circuit.

Until recently I have fitted Hercal cylinders in my house and they always worked without any difficulty. I have now replaced the old copper Hercal with a stainless Telford cylinder but cannot get any primary circulation.

I have flushed all sections of pipework and tried bringing the boiler up to boiling point but there is still no hot flow down the coil. I can only assume that there is an air lock resulting from a coil which probably does not go consistently down all the way. It may not be helped by the non-smooth very flexible pipe. Perhaps a corrugated surface is not particularly good at promoting downward flow of water combined with chalk and cast iron particles whilst encouraging upward flow of trapped air.

I would be grateful for any advice or pointers to sources of information about this.

Neville
 

Reply to How can I cure my gravity circulation problem? in the Central Heating Forum area at PlumbersForums.net. Plumbing questions, answers, tips and tricks.

Plumbing and Plumbers

Plumbing Workwear

Shower Power Booster

Water Underfloor Heating

CORGI Direct for Plumbers

The Wetroom Store

Plumbase Spares

New Posts Threads Members

Top