Glow-worm Ultracom 1 30cxi - Openthem Nest OTC sensors

[Thpin]

Can the OTC1 & OTC2 connections on the Ultracom 1 30cxi be used to connect to the OT1 & OT2 on the google nest heat link in order to enable openthem?

The boiler engineer who fixed a few issues for me previously has installed the system but only connected the boiler using the on/off functionality. And there is currently no wiring utilising the OT1 or OT2 on the heatlink. I've called glow worm and they seem to think it may work but were a little hesitant.

Does anyone know if this will work? Also if this is possible can someone suggest the wires i will need to use to do this?

 

[rbranco]

Ide say no as Glow-worm is Vaillant and they use similar ebus, not opentherm.

There is a ebus<>opentherm board that works on vaillant from netherlands and I think there is the same for glowworm but under another name.

 

[rbranco]

https://www.automatedhome.co.uk/vbu...OpenTherm-Compatibility-with-Glow-Worm-Boiler

 

[Thpin]

Okay thanks

so if I’m using the 0020036768 opentherm module awb. As suggested on the my boiler site.

Will the set up be

heatlink ot1 and ot2 > module > ebus interface on the boiler?

Or does it connect directly to the PCB?

So
heatlink ot1 and ot2 > module > Pcb?

 

[rbranco]

I've not seen module but normally the module will have its own connections as ebus and opentherm specs are different. There could be a proprietary interface or goes via ebus, I do not know.

 

[muggles]

The OTC connections are for Outdoor Temperature (IE weather) Compensation, not OpenTherm

 

[hallra]

Okay thanks

so if I’m using the 0020036768 opentherm module awb. As suggested on the my boiler site.

Will the set up be

heatlink ot1 and ot2 > module > ebus interface on the boiler?

Or does it connect directly to the PCB?

So
heatlink ot1 and ot2 > module > Pcb?

Hi Thpin,

Did you eventually install this and get it working?