I have an MSZ-GS30NA air handler and looking for a compatible Wi-Fi interface. In the diagram on the listing here (https://shop.rfwel.com/mitsubishi-electric-pac-uswhs002-wf-2-wireless-wi-fi-interface-control-2/), I see the MIFH2 component. Is that a mandatory item? I simply want to connect a Nest thermostat.