I'm installing the mini split and wiring it to the disconnect they had for a spa which is now long gone.
They wired a 110 gfci off the disconnect which I'm not touching.
Coming in from the main panel is a 3 wire line, black, red and neutral.
The neutral is connected together at the neutral bar in the box, the ground for the GFCI is connected to a screw to the box. My mini split only asks for 2 hot wires and a ground. Should the ground go to the neutral? Picture of the box attached.
The yellow on the left is the new wiring, the black on the left is the gfci and the right is the line in.