What is the best way (if any) to control a Mitsubishi Mini Split HVAC system using Crestron Home OS4? The house is being renovated and there are no tstats in place yet. Can we use any of the Crestron Tstats? Thanks in advance.

As MGmail says, it depends on what the form-factor is.
Either way, you should look at . they have integration devices for Mitsu and other Mini-Split systems. I only deal with Custom/SMW systems, but I'm sure that they are working in CH as well...

If this is an actual "standard Mini-Split" with a wall/ceiling mount head unit (the standard old-school, ugly wall unit type), CoolAuto will work without any additional Mitsu stuff.
If it is a "Ducted Mini-Split" where you have 'traditional' air ducts, etc. this format will require a temp sensor, etc.
>>> I just resolved an issue with a Mitsu Ducted unit and the best solution was to use one of Mitsu's TStats with thier remote temp sensor, then we used the CoolAuto unit to integrate with Crestron...
>>> There is also a way to use a 'Standard' TStat like a CHV or Horizon unit with the ducted style, but you'll need an appropriate Mitsu interface module (You'll have to research that one...)

Is this the one that has the giant IR remote with an LCD screen and 30 buttons under a cover?

If it's expandable via BACnet, that probably works great -- I'm more familiar with the IR side and will share what I know.

The IR remote has a vast number of options on it -- and unlike most IR remotes for TV's etc. (that transmit single button presses at a time), this IR remote blasts a relatively large (144 bit) packet that contains all of the configured options on the device, all at once, just about every time you press any key.? I own one of these Mitsubishi units.? You are never sending individual keypresses to the unit.

You might be able to learn yourself an IR driver that recalls a series of pre-saved configurations (such as one for being "on" at each discrete degree setting, along with an "off" and a "fan only") and blast them back out to follow the setting of the thermostat.

Of course, each learned IR message is going to capture a snapshot of the whole configuration at the time (such as the mode, the direction of the vanes, the fan speed, etc) and maybe that's okay and hits the spot all in one day.? In fact, in retrospect, it's probably cleaner than IR "button presses" -- you're literally configuring the whole device in a single act according to your wishes -- it either all works, or it doesn't.

Once for a different mini split A/C unit (I believe it was a Lennox) I made an Arduino sketch that took serial RS232 input and built the appropriate IR packet and sent it onward to the air conditioner.? It worked exactly as expected and I had full control over all the options, and then I put the original remote in a drawer and never had to use it again.? Same concept, it had a 63 bit packet instead of 144.? The Arduino kept track of the last setting sent in its own nonvolatile memory, so all options could be repeated in the full packet, and so each minor adjustment (such as a changed temperature) kept all of the other settings intact.

The IR protocol for the Mitsubishi available is online, I notice that somebody else did the exact same thing I did with an Arduino for the Mitsubishi unit, and published their code.
https://www.analysir.com/blog/2015/01/06/reverse-engineering-mitsubishi-ac-infrared-protocol/

Then again there's also BACnet, and also the possibility that someone has already delivered a production quality Crestron driver that I don't know about.

I actually spent some time on this Mitsubishi HVAC this evening.? I got an ESP32 Arduino to talk to it.? It acted as a UDP Server, and upon UDPSending it text like "ON" or "HEAT" or "72" (a temperature in °F), the Arduino sent the IR commands and the HVAC unit responded.

The specific Arduino I used was the "ATOMS3" because it's $8 on DigiKey, looks presentable, has WiFi, and an IR emitter built-in.? But going this route is probably not worth anyone's while unless you're either A) developing a driver for lots of people to benefit from, or B) really care that the client maintains controls over the louvers, the direction the air blows, the fan speed, enough to take the time to implement all the buttons.? But now that I know I can control my own unit (which I never really thought much of until today), I bet I'll have it on my own system soon.

I'd summarize my conclusions like this:? If your client is okay with a single permanent setting for the louvers etc. and is OK with Crestron having basic control (like off, heat, and cool, for all of the possible temperatures), then just learning IR presets from the remote as "commands" into Crestron to basically create an IR preset matching every possible combination of heat/cool x each temperature is very likely going to work great.? (it goes from 60°F to 88°F so that's 29 possible settings... therefore a max of 29 heat commands, 29 cool commands, and an "off" command... that's for fahrenheit... if you're celsius, it's even easier, only 16 possible temp settings from 16 to 31.).

Get a CoolLinkHub and CoolPlugs (CP-ME)

The Plugs can run wireless or wired(modbus daisy chain), and get powered from the indoor unit.

One Hub. One CoolPlug per each Indoor Unit.

Home would talk to the CLH via Bacnet.

I actually work for CoolAutomation now, in full disclosure, but this is the best solution out there. I used them as an installer all the time...

?https://coolautomation.com/products/coolplug-coolinkhub/

Yes, essentially the CoolPlug emulates the native Mitsu WRC (wall room controller.)

Clean.

Correct me if Im wrong but I have a Mitsubishi HVAC and it's working fine with crestron 3 series processor and CoolmasterNet but I moved? to CH and now I need bacnet but coolmasternet doesn't support bacnet ( seems like it's a couple years old unit ) so I need to buy the same unit with Bacnet support??

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If you ask Cool Automation nicely they will update the CoolmasterNet and enable Bacnet for you.

The CoolmasterNet is fairly old I bought it in 2018 and it won't update past firmware version 0.6?

Quoting support :?

The device is older hardware and does not support BACnet communication. It cannot be upgraded, you will need to purchase a new device. For Crestron Home you require BACnet, we don’t have another way of integrating.

I have 8 indoor units for the VRF system so I'm considering adding a DIN-AP3 to the CH and using a bridge between the two processors... Still cheaper than buying the whole thing tbh.

Take a look at Ultamation's SIMPL HOME

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