On 08/05/2015 22:18, Cursitor Doom wrote:
On Fri, 08 May 2015 22:02:03 +0100, The Medway Handyman wrote:

Most TRVs are multi directional.

Unfortunately, this particular one isn't.

Make a temporary connection between the two exposed ends. Run the boiler
for a few minutes and see which pipe gets warm first.

--
Mike Clarke