Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is flow
and which is return?

TIA

Cheers,
David.

David Robinson wrote:
Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is flow
and which is return?

Any arrows on the pump? The boiler may also have indications of which
terminals are flow & return. If not, you can almost certainly google for a
boiler manual which would show which was which.

Tim

"David Robinson" wrote in message
...
Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is flow
and which is return?

TIA


Why do you need to know: you'll soon find out when you put the rads back
and turn them on?

S

spamlet wrote:
"David Robinson" wrote in message
...
Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is
flow and which is return?

TIA


Why do you need to know: you'll soon find out when you put the rads
back and turn them on?

And then find that you've fitted the TRVs the wrong way round? No thanks.

Tim

On Mon, 26 Apr 2010 22:32:03 +0100, "Tim Downie"
wrote:

spamlet wrote:
"David Robinson" wrote in message
...
Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is
flow and which is return?

TIA


Why do you need to know: you'll soon find out when you put the rads
back and turn them on?

And then find that you've fitted the TRVs the wrong way round? No thanks.

ITYF that most TRVs nowadays don't care about direction of flow.
Certainly my Danfoss ones fitted six or seven years ago are
bi-directional.

--
Frank Erskine

"Tim Downie" wrote in message
...
spamlet wrote:
"David Robinson" wrote in message
...
Having googled this, I realise I should have figured out the flow and
return of each rad before taking the system to pieces. Hindsight etc!

Unfortunately, the system is completely drained down, and all the old
rads have been removed. So checking which side of each rad gets hot
first could be a challenge!

However, access to almost all pipes under-floor is currently good, so
I could "easily" do some tracing.

In a drained-down system, how can I tell, at the boiler, which is
flow and which is return?

TIA


Why do you need to know: you'll soon find out when you put the rads
back and turn them on?

And then find that you've fitted the TRVs the wrong way round? No thanks.

IMHO: TRVs belong in the recycling bin where they will do the most for the
environment, and save an awful lot of time faffing about unsticking them all
the time.

S