How would one go about determining the load of a heat pump compressor in Volt Amperes? Is there a formula to convert tons to V.A.? Let's say that we have 3 - 3.5 ton units that has a R.L.A.(Running Load Amps) of 21.2, a minimum supply circuit of 28 amps, a max. fuse size of 45 amps and a minimum fuse of 35 amps. What would the load calculation or actual draw of these units be?