Hi
Iam just replacing my centrel heating boiler but the system in my
house is on gravity hot water.
I have got to change it over to a fully pumped system. Does anyone
know if its ok to leave the cold feed and expansion pipes on the
cylinder coil pipes where they are and fit the pump and motorised
valves to the return line of the boiler. This would mean the vent pipe
was constantly open to the boiler but the cold fill will only have
access to the boiler through the cylinder coil and down the flow pipe
to the boiler unless the ho****er valve was open.
Thanks Roo

wrote:
Hi
Iam just replacing my centrel heating boiler but the system in my
house is on gravity hot water.
I have got to change it over to a fully pumped system. Does anyone
know if its ok to leave the cold feed and expansion pipes on the
cylinder coil pipes where they are and fit the pump and motorised
valves to the return line of the boiler. This would mean the vent pipe
was constantly open to the boiler but the cold fill will only have
access to the boiler through the cylinder coil and down the flow pipe
to the boiler unless the ho****er valve was open.
Thanks Roo


Not really. Blank them off and run the indirect coil pressurised.

Better still fit a pressurized tank.

On Fri, 08 Jun 2007 12:35:58 -0700 someone who may be
wrote this:-

Iam just replacing my centrel heating boiler but the system in my
house is on gravity hot water.
I have got to change it over to a fully pumped system. Does anyone
know if its ok to leave the cold feed and expansion pipes on the
cylinder coil pipes where they are and fit the pump and motorised
valves to the return line of the boiler. This would mean the vent pipe
was constantly open to the boiler but the cold fill will only have
access to the boiler through the cylinder coil and down the flow pipe
to the boiler unless the ho****er valve was open.

Very much not ideal and worth changing while the boiler disruption
is happening. They should really connect to the pipework near the
boiler. There are a number of variables though in terms of where
pipes connect and where pumps go, without details of your system
there is only so much advice that can be given.

A system as you outline may work without problems for decades, but I
wouldn't recommend trying.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54