Refrigerant to cool compressor windings

[Joseph'bidness]

I piped a compressor discharge to an oil cooler (a small cup containing drain water from freezer and a copper coiled discharge line submerged), then to the oil port on the compressor, and finally out of the other oil port to the condenser to return through the suction line. Compressor dome stayed cool to the touch as the suction line. This drastically eliminated any waxing problems with in a cap tube system and allowed the compressor to run cooler.. Any suggestions as to why this isn't a normal hook up in manufacture literature?

[Joseph'bidness]

It was a domestic refrigerator/freezer using R134a...

[SBKold]

Built by frigidaire the cup is how if evaporates the water from defrost cycle and is not a desuperheater unless it is so humid that cup is constantly replenished.

The correct oil cooler arrangement takes the liquid from the last 1/3 of condensor and runs it through compressor.

As you piped it discharge can actually heat up the compressor if no water is in that cup.

[Joseph'bidness]

Built by frigidaire the cup is how if evaporates the water from defrost cycle and is not a desuperheater unless it is so humid that cup is constantly replenished.

The correct oil cooler arrangement takes the liquid from the last 1/3 of condensor and runs it through compressor.

As you piped it discharge can actually heat up the compressor if no water is in that cup.

True, but with the water cup full it is clearly better designed.

[Joseph'bidness]

Why not use a water fill/flow sensor teed into the dispenser line to keep the cup constantly filled with cool water? .33 is a problem repeating, I'd rather keep my cup at least .50

[Tech Rob]

Wow, are you related to FengsHVAC?

[jpsmith1cm]

Almost all hermetic compressors are refrigerant cooled to begin with.

[SBKold]

To tee a water line? Well you would have the first watercooled upright freezers! Sounds like a mess though.

[craig1]

This drastically eliminated any waxing problems with in a cap tube system and allowed the compressor to run cooler.. Any suggestions as to why this isn't a normal hook up in manufacture literature?

Is cap tube waxing an actual problem in residential equipment? I've never seen or heard of it happening.

[jpsmith1cm]

Is cap tube waxing an actual problem in residential equipment? I've never seen or heard of it happening.

True wax is a leftover from the refining process of Mineral oil.

It doesn't exist in a system with a synthetic oil.

[craig1]

True wax is a leftover from the refining process of Mineral oil.

It doesn't exist in a system with a synthetic oil.

I guess we should say cap tube blockages due to oil breakdown then.

I've never seen it happen in residential equipment.

I believe the reason is that resi equipment runs lower discharge pressures due to the small compressors and relatively huge condensers and is usually located in a nice home kitchen that rarely sees over 80 degrees ambient temps

[SBKold]

I wouldn't call it wax. It was more like chalk or salt.

[jpsmith1cm]

I wouldn't call it wax. It was more like chalk or salt.

Soap....

[craig1]

Soap....

So if we add some water to system it should dissolve and clear the cap tube out

[monkeyspanners]

Soap....

Read years ago in a Bitzer report that R134a and poe oil can make metal soap and block cap tubes, though very few people seem to have heard of it judging by responses i've got when mentioning it.

[jpsmith1cm]

Read years ago in a Bitzer report that R134a and poe oil can make metal soap and block cap tubes, though very few people seem to have heard of it judging by responses i've got when mentioning it.

I has to do with the chemical breakdown of POE oil.

Any refrigerant with POE oil will do it.