Complicated behaviour of UFH controls

[AlanCraig]

I have a UF system which is behaving oddly and no-one seems to be able to figure it out. All sorts of odd things happen, I'll try to explain a couple.

The controls are Uponor, the house is on two floors. Each floor has a UP 36 controller attached to outside and pipe sensors (the ground floor is screed, the first is wooden).

There is a manifold on each floor with three thermostats on each.

If we first turn all stats down so that nowhere is calling for heat then turn up stat 1 on the ground floor, the appropriate actuator opens but, no matter how long you wait, there is no flow through the return valve.

If we turn them all back down again then turn up any stat on the first floor, we see exactly the same behaviour with the first floor actuators/flow. More puzzlingly however we now see flow through the return valve of one of the downstairs loops.

To add to this, this flow just described always happens immediately - I believe that the stats (T35) are not interrogated continually by the controller and that nothing should be immediate.

It's tempting to think that the whole thing has just been wired up very badly, but some of these problems seem to me (in my limited understanding) to be physically impossible. Also we've had it checked out by several people who can't seem to find the cause.

Any ideas?

 

[Norcon]

With a system like that its best not to have any independent zones that can call for heat outside of the main mixing valve zone.

Main reason being the indoor sensor (though optional) cannot cater for the correct mixed temperature inside the sub zones.
If there are rooms you don't want heating then the best way is to time manifold actuaters to remain closed within certain time spans.

That's re-badged Kanmor 360-e controllers on your system.
My guess is they have added the manifold actuator controller to each floor also.

You should get the chap who wired it to sort it out.