The two numbers are 208/240v the L1/2 is the heater circuit and L3/4 is probably motors, controls, etc.

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But it doesnt add up for example the rectangle red mark has 11.3kw hearer at 208V single phase which has FLA of 54.3A.

If I look at L1 heater amps its only 36.2A??? How?

However if I add up L1,L2,L3,L4 amps which is 36.2A+18.1A = 54.3A which is exactly FLA of heater. Seems like shared between all four lines

I dont know what is going on?

Also if you look the second column Min ampacity has one asterisk which at bottom says it takes into account motor blower largest fan used with heater and that too has L1,L2,L3,L4. I dont know largest blower motor size is but if you know then one can cerify that too Seems to share all four lines.

???

It looks like both heater and unit require one dual circuit L1,L2,L3,L4 but then how would disco work if that is true?

I dont know what is going on their at all?