Whirlpool should have manuals available to technicians who repair their systems. Talk to your local friendly HVAC repairman. You would want to do that anyway, since that person will be able to help you do things like properly charge your system and help you decipher the cap tube tables that the mfg's put out.
Hint: try making friends with the repairmen at a business that caters to commercial clients. Residential repairmen don't exist anymore for all practical purpose. Only commercial sites repair their HVAC systems anymore, because it costs more to repair a home fridge/freezer than it does to replace it!
I'm not trying to avoid answering your questions, but you really need a set of specs before you design, imho.
You can just forge ahead and blow it out with dry propane and stick mineral oil in there, and then hope that a dryer will get the rest of the moisture. You can cut different lengths of cap tube and do the try-try-again approach too. Experimentation will lead you to the proper restriction length. Or, you can stick a thermal expansion valve on the system to replace the need for a cap tube.
But, I suggest that you try to determine what you've got first and then you can start calculating a good starting value. For example, you don't know how much pressure differential the compressor will support, nor do you know the maximum flow rate that it will push.
Oh, as for valves, I suggest going to Graingers (they are on the web) and get some schrader valves. Adding access points at several points along the loop will really help you fine tune your system.
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