Multi zone setup

This Forum is about the Opentherm gateway (OTG) from Schelte

Moderator: hvxl

Multi zone setup

Postby Sloth » Sun Jan 13, 2019 6:10 pm

Hi Guys,

Last year the piping for the heating was completely redone and I’ve asked the plumber to also build in valves for several zones, right now all valves are open and I use a nest thermostat.

I’m probably using the wrong words, but is there a way to get the OTGW support multiple (5) zones and combine the data from the mutliple thermostats (and open the valves for the right zones)?? So if zone 1 and 2 request heat that the total heat delivered by the ATAG heater is the sum of what zone 1 and 2 need.

Thanks!
Sloth
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Re: Multi zone setup

Postby hvxl » Tue Jan 15, 2019 10:02 pm

You can only connect one thermostat and/or one boiler to an OTGW. Maybe you could use an OTGW per zone with just a thermostat connected to each additional OTGW and use a gpio port to switch the valve of that zone. But you would have to modify the firmware to be able to do that. You would also have to write code for an external controller to collect the requests from the OTGW of each zone and somehow combine that into a control setpoint for the main OTGW to send to the boiler.

So, it will take some work. I am not aware that someone already attempted something like that.
Schelte
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