[luxtronikheatpump] add EVU2

[riess82]

Great addon!

I would like to see EVU2 added as channel, as the combination of EVU and EVU2 are the SmartGrid feature of the heatpump, where available. The 4 available status are described on page 32 of https://mw.ait-group.net/files/docs/DE/A0160/83055300.pdf

Attention: I think that the meaning of EVU is inverted when the SmartGrid feature is enabled on the machine.
In classic mode (without EVU 2 in use) 230V on EVU 1 means run, 0 V means stop
With Smart Grid enabled, 230 V on EVU 1 AND 0 V on EVU2 means stop.

EVU 2 is mentioned in https://loxwiki.atlassian.net/wiki/spaces/LOX/pages/1533935933/Java+Webinterface as ID 185.

Best regards in advance

[sgiehl]

Thanks for bringing this up. When the binding was implemented it was not sure what channel is good for. I'll do some tests with my heatpump, as I meanwhile also have a smart grid enabled.