For a modification like this one I always take apart the whole unit and braze everything back together afterwards; there are a few things you need to watch out for when you do this, otherwise you might have a hard time putting things back together.
For one, make you spot the thermal sensor which is placed on the inlet of the condenser, this sensor protects the unit from overheating if the cooling fan would fail.
Here’s picture of all the goodies laid out on top of the case
This particular unit has a small leak in the suction hose, this is a weak point of the prometeia unit's.
I started by removing the oil from the compressor. A leak will cause air to be sucked in and form moisture inside the compressor which will eventually lead to a malfunction.
Now let’s put some new Fresh POE oil in.
With the compressor refilled I can start to braze already a few things. Because the stock condenser can’t remove all the heat output generated by the upgraded unit, I am installing a coiled piece of 1/4” copper tube right after the condenser (also named desuperheater).
Without it, when the unit is fully stressed and running inside a warm room, pressure in the unit can get higher than normal. This leads to lower performance and that’s not what we want, now do we?
The condenser is now brazed onto the desuperheater and a piece of copper for the liquid line to the filter/drier is also done.
I moved the filter because it wasn’t placed optimally, in its new place the unit will cool down faster because liquid can easily travel to the filter now.
Next I’ll start working on a new evaporator ->