How to wire Vokera Unica Max S with PDHW & Weather Comp

[Protease]

Current system;

Upstairs Rads - 1 heatmiser neo v2
Downstairs UFH - 3 heatmiser neo v2
Unvented tank joule invacyl - heatmiser neo v2

All separated into their own zones with 2 port valves. Connecting to UH4 heatmiser wiring centre, which sends volt free switch to boiler.

Will be doing the following work;

- 1x CCT for UFH
- 1x CCT for rads with pump
- Feed tank through primary loop flow & return

Question;

- Is there a way to send a switch live to boiler from tank zone valve which will interrupt the volt free signal from UH4 (closing rads+ufh pumps) to get the boiler to fire at high rate?
- Keep the heatmiser thermostats and use weather comp to manage flow temperatures?

Boiler: Vokera Unica Max System

Thanks

 

[Deleted member 267285]

@vulcancontinental might be the one for this. I’m not au fait with PDHW systems

 

[vulcancontinental]

Yes, there's a relay included with each system boiler that allows switching to WC flow temps when DHW stat is satisfied. I don't have the diagram here but a call to tech should be able to source one.

 

[Deleted member 267285]

Yes, there's a relay included with each system boiler that allows switching to WC flow temps when DHW stat is satisfied. I don't have the diagram here but a call to tech should be able to source one.

Top man! Thanks.