Grease instead of OIl in Daikin compressor

[Peter_1]

No traces of moisture ..opened after a failure and found grease-like content in the compressor instead of oil.
Anyone an idea of what this can cause?
Thanks15654156551565415656

[frank]

Hi peter

Is the system on R407C?

[Peter_1]

Gas is R410a Frank1565715658

[martin102]

Is this off a VRV system?

[NH3LVR]

Could this be analysed in a lab like an oil sample?

[Peter_1]

Could this be analysed in a lab like an oil sample?

That's what I also suggested...it's coming out of a VRV system... anyhow, very strange... and interesting to know the cause, also for the Daikin factory... it"s someone working for the factory here nearby asking me this

[frank]

I've seen something similar on many R407C systems where poor installation practices had been carried out - basically insufficient vacuum leading to moisture in the system.

Not seen anything like this on R410a systems though.

[charlie patt]

Had some similar oil breakdown with contaminates causing excess heat in comp both times eev stuck causing bypass straigh back to comp

[al]

Interesting post on linkedin earlier from a motor rewind company, if the shaft of an inverter motor isn't grounded properly then current can flow through bearing to ground, via the oil/grease, does it effectively cook it i wonder?

[chemi-cool]

Looks like moisture in the system.
Bring the lab results please.

[Peter_1]

Thanks so far for the input, I'l keep update as soon I have more news... They replaced compressor and it was a tech whom was curious what was inside the compressor... they were in fact not very interested in the cause of this problem... but Daikin can leaer na lot of such a problems

[monkey spanners]

Don't think its was due to moisture as I would expect there to be copper plating on the bearing surfaces if moisture levels were high.
Have seen oil turn black where discharge temperatures are high, either due to leaking valve plate in a recip comp, and also once where someone had fitted a 3.5kw indoor unit on a 5kw outdoor, suspect it cooked itself in heating mode, the discharge pipe was full of similar black contaminant. Maybe its ran with air in the system due to incorrect vacuuming procedures?

Wouldn't want to warranty the replacement compressor!