The standard-catalog entry of the 5.5 kW G120X on 230 V: the FSC frame, 22.8 A nominal and 29.7 A max, unfiltered and IP20, ordered through the P line that ends the code. No options attached - the base from which the rest of the 5.5 kW matrix is built.

Why does the same 5.5 kW drive appear twice in the catalog?

P and F are two ordering designations for one hardware - the same frame, the same ratings, the same I/O. The P line is the standard catalog entry, the F line the alternative ordering designation, so the same drive stays reachable through two channels. The duplication is a channel arrangement, not a technical difference: when the catalog line is what the procurement system quotes, the P drive is the one to order.

Is 5.5 kW the right step on a 230 V supply?

For pump and fan duty the answer is usually yes: 22.8 A nominal with 29.7 A for peaks covers quadratic loads that grow with speed squared and run mostly below full load, at 110% for 60 s. Linear loads that start hard or demand sustained overload fall under the HO line, where this same hardware is rated 4 kW - check against that line before ordering. A station that outgrows 22.8 A belongs on the 7.5 kW 3YC24, which carries 28 A LO.