Zoning Mitsubishi Zuba-Multi Systems
With my new house, a little over a year old, we built net-zero. Part of that was a heat pump, and I was told that the specified Mitsubishi heat pump (branded Zuba, but is basically just a P-Series air handler combo) had a zoning solution that worked well.
First the warning: DON’T DO IT. Don’t go for the Mitsubishi reccomended zoning solution. It’s actually an AirZone product, and Mitsubishi tech support doesn’t know about it, and doesn’t know how to help debug it, or support it at all, and there is no feedback to help the techs as to what is going on. In the last year since the system was commissioned, we’ve had at least two failed dampers, the zone panel has failed, the one thermostat doesn’t report the correct temperature, the dampers randomly cycle continuously, and the unit fails to provide heat until the zone panel is rebooted, and the A/C didn’t provide cooling for the first summer. When the zone panel failed getting parts took 7 weeks. It’s still not installed correctly, and we were left without heat in our house for two months over December and January.
They’re coming tomorrow to attempt repairs. My expectation at this point, is that the repairs will fail, either on the day of, or shortly thereafter.
Now, the question: Has anyone used the Mitsubishi Thermostat Interface Module? It lets you hook up a normal thermostate to the indoor unit, and control it as a staged HVAC. First stage is ‘Modulating’, and second stage is ‘Max capactiy’. I want to use this module to integrate a traditional zone panel, in the hopes that I can have reliable heat again, and something that is debuggable.
I welcome any input.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part