I have a microbore central heating system in my home (8mm) and I need to add
some new radiators. I have located the manifold but I now need to identify
the flow and return for each of the existing radiators.
Any ideas on how to do this?

In article ,
writes
I have a microbore central heating system in my home (8mm) and I need to add
some new radiators. I have located the manifold but I now need to identify
the flow and return for each of the existing radiators.
Any ideas on how to do this?

One is hot, the other is not (as much), use a calibrated finger.

It allegedly doesn't matter which is which as modern TRVs will operate
correctly with flow in either direction but after having bother in the past I
prefer to have the flow pushing so as to open the washer, that is with flow
out of the pipe at right angles to the TRV body. That means having the
TRV on the inlet side if you like your TRV vertical or outlet side if you prefer
your TRV horizontal.
--
fred
Plusnet - I hope you like vanilla

On Thu, 18 Jan 2007 14:40:31 -0000 someone who may be
wrote this:-

I have a microbore central heating system in my home (8mm) and I need to add
some new radiators. I have located the manifold but I now need to identify
the flow and return for each of the existing radiators.
Any ideas on how to do this?

Turn the heating on. Feel which one warms up first.



--
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

"David Hansen" wrote in message
...
On Thu, 18 Jan 2007 14:40:31 -0000 someone who may be
wrote this:-

I have a microbore central heating system in my home (8mm) and I need to
add
some new radiators. I have located the manifold but I now need to identify
the flow and return for each of the existing radiators.
Any ideas on how to do this?

Turn the heating on. Feel which one warms up first.



--
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

I thought that you meant you need to identify each individual radiator's
flow and return. I have often pondered this as I want to replace a pipe.
I had thought (but not tried) - starting with a cold system - turn off each
radiator's flow and lockshield - leaving just one open. Fire up the boiler
and feel which pipes heat up (flow first followed by return). There
shouldn't be any flow to the isolated radiators so their pipes should remain
cold. Repeat progressively to identify the others.

Is this what you meant?

--


--
John

On Thu, 18 Jan 2007 17:22:59 GMT someone who may be "John"
wrote this:-

Fire up the boiler
and feel which pipes heat up (flow first followed by return). There
shouldn't be any flow to the isolated radiators so their pipes should remain
cold. Repeat progressively to identify the others.

And label each one in some way, so as not to forget which is which.

Of course, depending on what work is to be done and the current
system, there may be no point in identifying the flow and return to
an individual radiator.


--
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