Ok, so I drew some arrows to try to make sense of this drawing.
Did I get the flows right? This looks like an ejecs II system, with a TXV instead of a cap tube driving the downwind evaporator, and TXV 3 added in.
original ejecs 2:
Mike's rig:
If so, I have a question: Why does TXV 3 have its sensing bulb tied to the inlet of EVAP 1? I get that it is meant to digest extra gas and send it to the suction line, but what if? Such as what if EVAP 1 frosted up, causing the phase separator to suddenly burp? This would vent fog/burp juice straight into the compressor. Only after it burped sufficiently would the temperature drop enough to close the valve. Then it's too late, the compressor has to deal with the vomit from TXV 3.
The other looming question is: How does this piggyback to the faucet supply? Draw from cold, pump into hot, or vice versa, or with a third "suction" line? And what controls the water pump?