TRVs connected backwards - does it matter?

[jntelfer]

HI all. On the system I'm balancing we've found that a number of the TRVs are connected so that they're on the output of the radiator, even though the flow indicator on the valve shows that they should be on the input.

There doesn't seem to be any reason for it, other than the various fitters who've worked on the system over the years having a clear preference for fitting the TRV on the right hand side of the rad, regardless of what the flow is actually doing.

There are 2 or 3 different makes of TRVs on the 10 rads in the house. Are the ones connected against their flow indicator likely to make any material difference or is connecting them correctly a bit of a nice to have?

 

[gas112]

When onthe return they can be a bit noisy sometimes even bi directional ones and in reality it is always best to have them on the flow but if everything is working ok then just leave alone