Sorry, but I'm not a computer illustrator.
Main idea is this:
1. I want to be able to set it and forget it (in theory).
2. As few parts as possible (less is more).
3. Auto-defrost in heat and cool modes.
Basic operation:
w1 - heating - starts timer in heating defrost control
y1 - cooling - energizes reversing valve
g - energizes fan contactor thru defrost relay and compressor thru cooling defrost klixon (bimetal thermostat - opens at 20*f, closes at 50*f)