Yes, your Reg will work on either a 12 Volt or a 24 Volt system but not a combination. Given the above figures for a 12 Volt panel connected to the Reg with a 12 Volt battery bank to Batt terminals and the load to the Load terminals my understanding would be...
High Voltage Disco - The reg will disconnect the panel output when/if the battery voltage reaches 13.7 volts. You will see this happen with a Voltmeter placed across the battery terminals if above 13.7 then the Panel terminals (on my own reg reads approx 18 volts) will be 4 or more volts higher.
Low Voltage Disco - The reg will disconnect the load from the battery if the Battery Voltage falls below 10.5. This is why some people hook the load (fridge and lights etc) to the battery bank and leave the load terminals vacant
Low Voltage Reconnect - The reg will reconnect the load after a LV disconnect when the voltage is above 12.6
Green LED will illuminate whenever the Solar Panel Voltage is above Battery Voltage
Red LED will illuminate whenever Battery Voltage is above low voltage disconnect
In a balanced system you should only very rarely see a Low Voltage Disconnect in unusual weather or useage. Recurring LV disco's essentially mean that the battery capacity is too low and being depleted overnight or that the Panel Output is too low to replenish the power consumed by the load.
Not all the above may be 100% kosher as different manuf's will use the same terminology but may slightly differ in how their regs handle the different conditions.
Either way if you try a combo you will either have a 24 Volt panel with the Reg thinking the Battery is too low a voltage IE below 21 Volts or a 12 Volt Battery with the Reg thinking the panel is too high as your panel OP is minimum 19 Volts or more
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