Multi Zone heating issue- Danfoss TP5 & Boilermate OV Ac

[PAULM01]

Have moved into a house with separate heating upstairs & downstairs.

Each floor has a Danfoss TP5 thermostat to control the temperature and timings. There is a boiler in the kitchen and a Boilermate OV A class upstairs.

I have 4 heating scenarios, one of which isn't working how it should:

1) Heating timer set for upstairs only - Heating comes on upstairs only

2) ISSUE - Heating timer set for downstairs only - Heating comes on downstairs & upstairs

3) Manual override upstairs - Heating comes on upstairs only

4) Manual override downstairs - Heating comes on downstairs only

Any help much appreciated as to why this scenario 2 is not working properly. Means the upstairs of the house cooks!

The workaround is to control the downstairs via the manual override only, but this wont be ideal when it gets colder.

Thanks

 

[jackthom]

What exactly do you do to operate the manual override. Is it a switch or are you manually pushing open a motorised valve?

Some pictures of the system would be useful.

 

[PAULM01]

I just manually increase the thermostat temperature on the floor until the flame symbol appears on the thermostat, then the heating comes on on that floor only, until the set temperature is met.

 

[jackthom]

So at the times you only want heating downstairs have you programmed the upstairs TP5 to be OFF(or set to a low temperature) and the downstairs TP5 to be calling for heat ?
Or is there some sort of master switch somewhere that selects the zone(s) required from a central point.

 

[PAULM01]

Yes. When downstairs is set to call for heat, upstairs set to 10c, i.e. Off

There are other controls on the boiler mate, but believe these are set correctly and just let the tp5s control when required where.

Have just tried to recreate the problem and the heating stayed off upstairs this time. However, this problem has happened several times already.

Could there be a valve with an intermittent fault, which let's hot water into the zone where the heating is not being called for?

 

[D_Hailsham]

You should have two, or possibly three, valves like this:

View media item 11762

They should all be wired to a large junction box.

Please remove the lid of the junction box (careful - there's 230v mains in it, so it might be sensible to turn the lecy off.). Then take a pic of the wiring inside the box and post it.

 

[jackthom]

Could there be a valve with an intermittent fault, which let's hot water into the zone where the heating is not being called for?

That's looking very likely, they can become gunged up and may not always close properly. More frequent use now the weather is colder may get it moving freely again if you're lucky.
With many of these valves you can unscrew the actuator and remove it from the top of the valve body. Then check how freeely the actual valve spindle rotates.

Again some pictures would help.