I am trying to configure several chillers and there is some question as to what type of chillers they are.

The Model Number is YKGCG CH3 and we are unsure whether it is ascrew compressor type or a centrifugal chiller.

Everything I found on their website showed that a MIllenium Chiller is a screw compressor, but these are different in that they appear to have a gear set between the motor and compressor.

Is there anyone out there who can tell from the nomenclature?

Thanks,

Danny

The YK chiller is a Centrifugal. It utilizes R-134a refrigerant.
If you see the chiller it will be pretty obvious.

Drivewizard,

Thanks for the info.

Does Millenium refer to the contril, because I see Millenium Chillers that are screw compressors on their website.

Does the centrifugal chiller use a gearset? What will make the difference obvious?

Just so everyone else will know next time:

What made it obvious were the 9" high letters that said Millenium Centrifugal Chiller.

I believe the "Millenium" refers to the type of control system.
I think it is the "Opti-view" display panel that makes it a Millenium chiller. The "Micro control" panel will be a one line display, while the "optiview will be a graphical display, which is about 8" or 9" square. Much better display.
They do have a gear set. The actual ratio I am not sure of. But should be noticeable in the spectra.
I am just getting into Vibe analysis myself, I have worked as a service tech on large commercial/industrial HVAC For Trane for 15 years and been in the trade for 23. It only took me 15 years to convince our office to get into VA. Better late than never I guess.
So, I have alot to learn, just kinda been lurking in the shadows here, trying to pick up on whatever I can.

what will make it obvious (besides the 9"letters) that it is a centrifugal is the size of the compressor. The centrifugal has a large volute that discharges/connects to the condensor.
The screw machines have compressors that are much smaller.
Also, the centrifugals have an oil sump and oil pump below the condensor barrel.

The screws have no oil pump. The oil is driven by differential pressure between the high and low side of refrigeration circuits.

This message has been edited. Last edited by: drivewizard,

Wiz,

The info you provided confirms all my suppositions and adds some good stuff too. Thanks.

Glad to have you on the forum. We all know what we know and hopefully ask about what we don't. Usually a match between knowledge and ignorance occurs and helps everyone out.

Don't be afraid to aks even the most basic questions here. You will get an answer and no one here would ever try to embarrass another contributor for asking dumb questions.

After all, without dumb questions, we wouldn't even be having this conversation.

Danny