Go to rheem.com and look up their model# nomenclature. It can usually be found by looking at the spec sheet for any of their products, in your case a heat pump. That is if you don`t have the installation/operation manual for your unit, if you do happen to have that it`s on page 1 or 2.
2
2.5
3 ton
5 ton
two ton
4 ton
five ton
3 tons
3ton
The Rheem heat pump model number RBHC-14J11NFD has a tonnage of 1.5 tons. This unit is designed for residential use and provides efficient heating and cooling for moderately sized spaces. For specific performance details, it's best to consult the manufacturer's specifications or documentation.
3 TON
Your first set of numbers gives you the tonnage, so this is a 2 ton; your "4" number represents a 460-volt electrical requirement