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A little follow-up: last week I installed the new motor according to the "optional 3-wire connection" indicated in my first post (integrates well with the original wiring diagram). It's been...

Oh, sorry about that. Here's the unit info:

Date: 4/98
Model#: Trane TWR042C100B2
Min circuit ampacity - 28.0 amps
rec. fuse/breaker - 40
Max fuse/breaker - 45

Old motor
Emerson K55HXFHD-7740
RPM 825
Volt 200-230
Hz 60
Amp 1.9
Ph 1
HP 1/4
Thermally protected

I was finally able to take another look at the unit and try to apply
Your advice. However I'm still not clear on how to proceed. To
Make things a little clearer I took some pics:
...

Thanks for your swift reply! I appreciate your expertise.

I'm still not clear on what "Use L1 and L2 to power the motor..." means.

Black: motor ----> contactor (as before)
Purple: motor...

Hi. My heat pump fan motor died. I got a replacement motor and capacitor but the wiring is a bit different for the new parts and I was hoping you could help me sort it out. The old capacitor had...