Airtouch 5 bypass size?

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Handle9

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#3247036 10-Jun-2024 17:12

dazdaz:
Handle9:

You'd freeze the coil at 150 l/s. You can't beat physics.

If that is the case I would have thought the same would happen with a bypass installed, if the unit is circulating cold air passed the coil, its going to get pretty cold.

If you’re basically 100% bypass then it’s possible. If you have got basically no demand the unit shouldn’t be running. It’s reason 56 why these zone solutions are a cobbled together kludge.

timmmay

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#3247070 10-Jun-2024 18:37

I was told Daikin had released its own version, but the one on it's website is fairly poor. Four step dampers, no API mentioned, limited control.

The systems do generally work fine, and people say the bypass controls work well. Spill zone is annoying, by default it doesn't work great on Airtouch 4 maybe it's better on Airtouch 5, but tweaking things with the API it can be made to work fairly well. Before I did the HA changes the spill zone set to 23 could get to 26 or 27 degrees at times, as the Airtouch closed the room dampers extremely slow when it was almost up to heat. My changes use the API to tell the dampers to stay open wider for longer, so there's less spill.

MrMistofeles

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#3253151 25-Jun-2024 19:38

timmmay:
I have a Daikin 10kw ducted, airflow numbers L/M/H are 383 / 458 / 533. Both your mitsi and my Daikin have 1.4X more airflow on high than low. It feels like a bigger difference though. I don't know anything about Mitsubishi other than they're good quality. Airtouch 4 only uses the Daikin fan settings.

Yeah I'd have added bypass but getting the manifold made is too much hassle. You could try using Home Assistant to automate things, I can give you some pointers. You can have the spill zone set to wherever you like, your master bedroom if you like, but it will get a bit hotter than you prefer. Airtouch 4 tends to turn the damper down from 100% well before it's up to heat. One of my automations watches for when that happens, when it's not up to heat and closing the damper, and opening it back up. Another detects when the damper is only slightly open and opens it more to avoid overheating the spill zone. It does other things too, basic on / off / temperature / zone control, I have 172 automations but that's across three heat pumps, a bit of lighting, ventilation, blinds, phone, etc.

I wrote a guide with my Airtouch / ducted experiences here, if you're interested. You might pick up a couple of things, like vents.

I'd be keen to look over or hear more about your automations. I briefly looked into Home Assistant 4 years ago when I first got a ducted system installed with airtouch4 but then kids came along.

Recently I have restarted my HAOS journey partly because I have a bit of hobby time again but mostly because the default AT4 control is lacking (overheating spill zone, inability to set differential zone temps in programs, non optimal logic to get multiple zones to targets simultaneously, etc.).

Happy to start my own thread or use DMs if I'm taking things o/t here

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