Answer by
kipcat (1964)

The standard is 1. 5 hp per ton. Which is 4. 5 nominal hp for a 3-ton unit. 746 watts in a hp, times 4. 5, 3357 watts, for residential, divide by 220 for 15. 26 amps. The fan adds a little but not much, so a 20 amp 220 volt breaker would work.

Isn't it that 1 ton (for refrigeration terms) is equivalent to 4.7 Hp? So for 3 tonner ACU, would it be 13.2 Hp? Just confused. add a comment