Hi everyone, great forum, I'm hoping to get some advice.

I have a below ground wine cellar with a staircase to the ground floor. It is 45 cubic meters in volume.

I have been running it without active cooling (passive) for 2 years and throughout the year it temperatures range from 16 degC to 23 degC. I am installing a Daikin Cooling only Conventional Split (1.5HP).

I have a Windland DPM-4 temperature/Humidty monitoring alarm panel. It has four zones, each with NO/NC potential free (dry) contacts.

I would like to use one of the zones (temperature) to control the plit unit. I can run a 240v relay switch to literally turn the unit off/on (unit has auto restart), but I thought there might be a better way to do this.

Looking at the Daikin site, there are some accessories for these units which may work.

--------------Single Split

ARC433A42Minimum set control for FT & FTKD Cool Only SeriesBRC15A61Set Back Time ClockBRC1D619Wired Remote Controller with weekly schedule timerBRC7C610Wireless remote control for FAYPBRC7C610WRemote Controller Wireless Type (FAY100FA)BRC7C611WRemote Controller Wireless Type (FAY100FA)BRC7E618Remote Controller Wireless Type (FAY71L)BRC7E618Remote Controller Wireless TypeBRC7E619Remote Controller Wireless Type (FAY71L)DCS301B61Unified On/Off ControllerDCS302B61Central Remote ControlDCS302C61Central Remote ControllerDCS601B51Intelligent Touch ControllerDST301B61Schedule Time ClockDTA102A52Interface AdaptorK-KDU572BVECondensenate drain pump (FXA-K)K-KDU572CVEDrain Pump KitKKP937A4Drain plug best to suit B Series Single and multi split condensersKKPJ5F180Drain Piping Kit (RMX/RMK, RY71-140)KPW937A4Air deflector grille to suit RXE-B and RKE-B condensersKRCS01-1Remote SensorKRKJ5F140V1Low Ambient Temperature Kit (R100-125LU)KRKJ5F80V1Low Ambient Temperature Kit (R71LU)KRP413A1SWiring Adaptor for Stop/Start InterfaceKRP4A516Wiring Adaptor for Electrical AppendicesKRP4A516Group Stop/Start/Status InterfaceKRP4A93Installation Box for Adaprtor PCBKRP928A2SInterface Adaptor for Inverter
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Unfortunately there is no information apart from a model number.

All I want to do is stop.start the AC from a potential free contact.

I'm also installing the head unit at the top of the stairwell as its the only place to run the pipework, it will sit about 3.5 meters from the bottom of the cellar. Will the cool air from the unit make its way down to the cellar efficiently? The cellar is sealed, including door.

Any help, or any other recommendations are appreciated.