Wiring for cold room

Is there a wiring diagram in the unit you can take a pic of with your IPhone and post here?

We don't get a lot of window AC questions here and few techs except appliance repair guys fix them as most HVAC companies are too expensive and it is cheaper to throw them away than fix.

However if it is 240 volt then the black is 120 volts hot and so is the white to get a combined 240. You should also have a ground and I doubt there is another neutral wire for some 120 circuit.

The thermostat should turn on the compressor relay and be in series with it I would imagine. Most furnaces and ACs use a 24 volt step down transformer from the main power to give you a 24 volt circuit for the thermostat/tstat and that turns on the control board.

Your tstat should be line voltage and heavier duty and as long as your control can handle the current rating of it then you may be able to switch it.

You would need a temperature sensor or thermistor to physically attach to the cooling coil to try prevent it from freezing but even then that is a risky proposition. The unit is designed to be operated at no lower than a 50 deg F outdoor temp and probably the same inside.

If you run it too cold you may slug liquid refrigerant to the compressor and wreck it. Use at your own risk. It needs a load to work against and the outdoor temp is part of the load.

Here’s the wiring diagram. I know many farmers who have used this technique, so I know it works. How long it will last I can’t say but I know a few that have run them for several seasons keeping various products cool such as flowers or vegetables. Each PID has a sensor, and one goes in the room and the other is attached to the coil and set to around 34 F to prevent freezing. Of course, it’s better if this can be wired in to only cut off the compressor, so the fan can continue to run and let the coils warm up a bit before letting it cut back in at around 37. I only need to keep the room around 40f, not looking for freezing.