I have 8 radiators, all/each fitted with a TRV, all fitted horizontally as
recommended by the manufacturer, although the plumber who fitted them was
not aware of this(I also have a room thermostat, but the TRV in bathroom is
always set to maximum and there is also an automatic bypass internal to my
combi).

The TRVs are birectional so could have been fitted to the flow or return,
but the manufacturer recommends to fit to the return(coolest) end of the
radiators.

The plumber has fitted 6 TRVs to the returns(fortuitously, as he had not
been aware of the manufacturers recommendations), but the remaining 2 on the
flow.

The plumber has (or says he has) balanced the system.

My question is(if he has balanced the system), when the TRVs begin to
control at different temperatures and/orI fully close the 2 TRVs(in
bedrooms) which have been fitted to the flow, will the system still remain
balanced and function correctly?

Keith G. Powell

On Mon, 7 Nov 2005 12:45:53 +0000 (UTC), "Keith G. Powell"
wrote:

I have 8 radiators, all/each fitted with a TRV, all fitted horizontally as
recommended by the manufacturer, although the plumber who fitted them was
not aware of this(I also have a room thermostat, but the TRV in bathroom is
always set to maximum and there is also an automatic bypass internal to my
combi).

The TRVs are birectional so could have been fitted to the flow or return,
but the manufacturer recommends to fit to the return(coolest) end of the
radiators.

The plumber has fitted 6 TRVs to the returns(fortuitously, as he had not
been aware of the manufacturers recommendations), but the remaining 2 on the
flow.

The plumber has (or says he has) balanced the system.

My question is(if he has balanced the system), when the TRVs begin to
control at different temperatures and/orI fully close the 2 TRVs(in
bedrooms) which have been fitted to the flow, will the system still remain
balanced and function correctly?

Should do.

The only reason for fitting them on the return is that they are less
affected by radiated/conducted heat from the radiator.

The two TRVs fitted to the flows may beed setting higher for a given
heat output.

sponix

In an earlier contribution to this discussion,
Keith G. Powell wrote:

I have 8 radiators, all/each fitted with a TRV, all fitted
horizontally as recommended by the manufacturer, although the plumber
who fitted them was not aware of this(I also have a room thermostat,
but the TRV in bathroom is always set to maximum and there is also an
automatic bypass internal to my combi).

The TRVs are birectional so could have been fitted to the flow or
return, but the manufacturer recommends to fit to the return(coolest)
end of the radiators.

The plumber has fitted 6 TRVs to the returns(fortuitously, as he had
not been aware of the manufacturers recommendations), but the
remaining 2 on the flow.

The plumber has (or says he has) balanced the system.

My question is(if he has balanced the system), when the TRVs begin to
control at different temperatures and/orI fully close the 2 TRVs(in
bedrooms) which have been fitted to the flow, will the system still
remain balanced and function correctly?

Keith G. Powell

Yes. It doesn't really matter whether they're on the flow or return as long
as they're configured correctly. [Many bi-directional TRVs have a little
gizmo which has to be set to one of two positions depending on flow
direction].

With an all-TRV system, the main point of balancing is to ensure an even
warm-up- during which time they are all open, anyway. Once rooms get up to
temp and the TRVs start operating, the relative flow between rads is
controlled by the TRVs rather than by the initial balance.
--
Cheers,
Set Square
______
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Keith G. Powell wrote:

The plumber has (or says he has) balanced the system.

I've never known a plumber to balance a system...

david