Here's an update:
Swapped out a pot-relay HSK (5-2-1 CSR-U3) for a ICM 805. Results are a tad of a head scratcher. Here's some tidbit info.
The Copeland motor has LRA of 127 - but I have no idea how that is tested, like what wiring harness is used, what size wiring, what the supply looks like. But ok, use that as a base #. My initial amp-clamp (inrush) of line did seem to indicate a LRA #. Run amps were around 8start/12run (~20A line).
With the initial install of the 5-2-1 the unit was starting with an obvious increase in torque. Nobody seem to know what an increase in start torque does to the mechanical side of the Copeland motor/compressor unit. Increasing torque within the same short time period equates to mechanical impact forces. This I am studying as an aside to these HSK's. With the 5-2-1 installed my amp-clamp (inrush) indicated near 46A. Seemed like an improvement from LRA.
Ok, I wanted to move over to a solid-state HSK and chose the ICM805. The condenser wiring did not accommodate the recommended ICM805 wiring diagram so I had to re-wire just a tad. Since the OEM setup split off Cap-Start and Run line at the contactor via two #12's, I converted that over to two #12's into a #10 (2-to-1) up to a terminal block. This #10 (line) loops through the ICM per ICM wiring diagram. The term block then feeds the cap with a #12 and the run coil with a #10 patch down to the motor's #12 run wire.
Upon 1st inrush test of the ICM I found it to be near LRA. Hmmm, odd, didn't seem right. Amp-clamped the motor start wire (while running) and had zero, and line amps were now near 25A. Ok, something not right, yanked wires and took mfd readings..... run cap (70mfd) is reading zero! Lucky for me I had a spare 60mfd, so installed that. And even with a dead start cap, the Copeland still started.
Here's where things get interesting. with the 60mfd and ICM805 installed, line inrush was still reading near/at published LRA. I was tad baffled, was then wondering maybe the 805 was a bad unit, so took the 805 wires off and did another start-up line inrush reading, and it metered in at 151A !!!
So now I am a tad baffled. Did using a 2-to-1 (two #12 to one #10, soldered) to term block, and, using a #10 to feed the motor run #12 (approx 6" worth of #10), be enough new wire capacity to allow 151A on start-up (w/o the ICM)?? Duly noted, OEM setup used spade terminals on everything, so maybe some contact issue there? My #10 from term block to the motor #12 is a proper soldered connection, and all the connectors I had to do are soldered (two spades to contactor and three eyelets on the term block). With the ICM805 in place, its seems to knock off ~30A from start-up, but will contact ICM and ask if that's the expected results.
I am not able to at this time do some data logging (amps vs time) between using the 5-2-1 vs the ICM805. I have the gear to do it, just not the time right now. I am wondering if the pot-relay of the 5-2-1 was simply cutting out sooner than the ICM805 does. Pic of relay is also attached so you can seen cut-in and cut-out settings. The cap will have near 380v on it during run time. I believe the caps used in both the ICM and 5-2-1 HSK's are about the same. Duly noted here, amp # alone doesn't tell the whole story, it's really area under the curve of amps vs time that tells us how much power is being used for the time period. So w/o data logging it, simply cannot see that with basic meters, etc.
Anyways, some interesting stuff if you ever get to dig into AC condenser to install an HSK.