The white wires connected to White AC are being powered by 120VAC. White AC (cluster of male connectors coming off the circuit board) is 120VAC. Red AC cluster provides 240VAC power. So if a white wire coming from a component like a pump or blower is connected to White AC it is running as a 120V. If it is going to Red AC it is powering a 240V component. Your components might only be 120V and can't be run by 240. You would have to verify each components voltage before making any changes. If it was set up and run as it is now then it should be fine as is. Again least of your worries at this point.