The ton you looked up is a different ton used for cooling towers or chillers. The conversion of 1 ton to 0.75 kW in the context of chillers is not a fixed rule or universal constant. The value of 0.75 is a good estimation between cooling tons and kilowatts, although this number can vary between different chillers.
"Fraction load" refers to the estimated percentage load of a particular equipment. For example, if the maximum output power is 50 hp, but the equipment is only running at 50% load, then it may only generate 25 hp. Fraction load information can be obtained from the plant supervisor and is not based on any derivation.
