Matching an air handler to a Trane XL16i
I have a proposal for a Trane XL16i (model no. 4TWX6048E1000B) which is matched with a Trane air handler Hyperion XL series (model no. TAM7BOC60H51). This is an all electric home so there is a 20KW electric strip heater in the proposal. The heat pump is 4 tons and the air handler is 5 tons (I think). I cannot find on the Trane Web page the TAM7B; they do show a TAM7A. Why is it necessary to use a 5 ton air handler with a 4 ton heat pump? Is the TAM7B a new model? I cannot find it on any Internet search.