As part of my getting to grips with the basics of central heating I learned that before the introduction of bi-directional TRVs, they had to be fitted on the flow side of rads.
Having just checked my own (I've been in this house a few months) I found that in every instance the TRV is fitted on the return side. Each is marked with an arrow (which I assume indicates the required direction of flow) and in every case the flow (as indicated by the relative temperatures of the pipes) is in the opposite direction to the arrow.
Questions: why did some TRVs need to be on the flow side? Surely if they are simply closing as a result of the room temperature reaching a certain level it doesn't matter whether they close the return or the flow side? And what is the result of my having my TRVs on the wrong side?
TIA Stephen
Having just checked my own (I've been in this house a few months) I found that in every instance the TRV is fitted on the return side. Each is marked with an arrow (which I assume indicates the required direction of flow) and in every case the flow (as indicated by the relative temperatures of the pipes) is in the opposite direction to the arrow.
Questions: why did some TRVs need to be on the flow side? Surely if they are simply closing as a result of the room temperature reaching a certain level it doesn't matter whether they close the return or the flow side? And what is the result of my having my TRVs on the wrong side?
TIA Stephen