Overkill oilseparator ?

piotres · 11-23-2006, 02:46 PM

Hi

I want to use a ShineYear oilseparator with float, like this :

There are some models of these oilseps produced by SY :

-1/2' fittings, 5.3 kW (power with R22)
-1/2' fittings, 7.0 kW (R22)
-5/8' fittings, 19.3 kW
-7/8' fittings, 28.0 kW

Before I have used version 5.3 kW in strong single-stage with rotary 9000 BTU and it was working OK

..oil is backed to compressor correctly

Now the problem is I can't buy any 1/2' version anymore

..I can only buy now version with 5/8' fittings, 19.3 kW, that's the smallest hehe

.

I have question - I plan to use it in 2stage cascade, two 1HP compressors, R507/R1150, captubes ..and if that 19.3 kW oilseparator will be working correctly ? I'm only woried about oil-back in "good" time

, fittings is of course no problem

.

Thanks

Regards
Peter

jinu117 · 11-23-2006, 03:19 PM

Well only thing I would worry about is... precharging of oil. You might need tad more than recommended but I couldn't be sure. I mean, we have absolutely no condensed 2nd stage gas in oil sep (I DEARLY HOPE), so only thing I am thinking right now are pressure rating of such and how much to precharge...

Trouffman · 11-24-2006, 01:18 AM

humm...

Firstly, whitout thinking about first stage condenser gas in the Oil sep (Yep, oil sep must be used on some first stage , in case of the design-tubing circuit...), all type of Oil sep can be used, BUT... this will increase the time to get the right HP, this will also increase the static pressure : If you increase the size of HP side, you'll need more gases and @ least this will increase the static temp... (not a jump of 4bars but don't forget this

).

Secondly, if you use a very big oil sep, you may put a little more oil into your CP but this isn't "absolutly" necessary. (more oil to prevent oil loss in the oil sep / tubing between Oil sep and CP !

esdee · 11-24-2006, 02:25 AM

Quote:

Originally Posted by piotres

Hi

I want to use a ShineYear oilseparator with float, like this :

There are some models of these oilseps produced by SY :

-1/2' fittings, 5.3 kW (power with R22)
-1/2' fittings, 7.0 kW (R22)
-5/8' fittings, 19.3 kW
-7/8' fittings, 28.0 kW

Before I have used version 5.3 kW in strong single-stage with rotary 9000 BTU and it was working OK

..oil is backed to compressor correctly

Now the problem is I can't buy any 1/2' version anymore

..I can only buy now version with 5/8' fittings, 19.3 kW, that's the smallest hehe

.

I have question - I plan to use it in 2stage cascade, two 1HP compressors, R507/R1150, captubes ..and if that 19.3 kW oilseparator will be working correctly ? I'm only woried about oil-back in "good" time

, fittings is of course no problem

.

Thanks

Regards
Peter

dude! you've found my lost keys! they're in that photo

I suspect you choose those oil seps because of the very very cost?
how did you found that they working correctly? did you checked the oil in the compressor before and after some long time use? (im not doubting, just curiosity)

why do you worry about the oil return in higher ton oil seps in the first place?
what changes expect the fittings (and maybe oil precharge)? i guess it still has a 1/4" oil return

piotres · 11-24-2006, 04:49 AM

Quote:

Originally Posted by esdee

dude! you've found my lost keys! they're in that photo

haha yes, that's yours photo

I suspect you choose those oil seps because of the very very cost?
how did you found that they working correctly? did you checked the oil in the compressor before and after some long time use? (im not doubting, just curiosity) No, I just have mine serivice hose full of oil, after turning off the compressor (suction service valve near oil back from separator)

why do you worry about the oil return in higher ton oil seps in the first place? That's the main think I'm worry about
what changes expect the fittings (and maybe oil precharge)? i guess it still has a 1/4" oil return I don't know, I haven't seen that 19.3 kW in real

Ok guys, I'll buy that 19.3 kw version and I think I just put some more oil into (precharge) .

That should be ok, yep ?

jinu117 · 11-24-2006, 04:55 AM

As for oil you will have to play by what you find. Something like sight glass from compressor outlet and sight glass on return line and see if there is enough oil going around... if not enough, just put some in compressor itself... :P

esdee · 11-24-2006, 09:23 AM

Quote:

Originally Posted by jinu117

As for oil you will have to play by what you find. Something like sight glass from compressor outlet and sight glass on return line and see if there is enough oil going around... if not enough, just put some in compressor itself... :P

nice idea!

i m using Danfoss OUB1 lately, very compact and the have the oil return on the bottom!i place the oil seps above the top level of the compressor to help oil return with gravity in case suction pressure is not enough!, good thing is, my evaps stay clean of oil all the time

bad thing is... it costs 110euros!

jinu117 · 11-24-2006, 02:24 PM

Yeah oil seps in US do cost bundles too. OUB1... eh... maybe I will ditch Henry since they all cost too much lol

Gray Mole · 11-24-2006, 03:18 PM

The thing to remember in these oilsep's is that the larger you have, the larger the capacity of the oilsep to 'hold' oil, and the larger amount of oil it 'holds' until release.

So, if you get a vastly oversized oilsep, and it takes 250ml of oil from 'low' to 'release' for instance, and your compressor takes only 400ml to fill...

Well that means that there will be a time when you have too little oil in the compressor on a regular basis.

So you'd have a choice, either put too much oil in the system, and have times when you have too much, or too little, or you get an oilsep with a small 'reservoir' that holds maybe 100cc between release and low levels.

Check the tank size on the oilsep you want to use and find out how much oil it takes to go from lowest level to level of release, and if it's too high, find a smaller model.

Cheers

Gray

BigBen2k · 11-24-2006, 04:09 PM

I was curious about that too: the oil seperator must have some kind of rating, for "oil capacity" or "minimal oil held quantity" or something. Googling only brought me to other threads by piotres , and some russian sites.

Gray Mole · 11-24-2006, 05:26 PM

Yeah, I looked up on AC&R's website and it's not something they list.

Precharge on their smallest (5180) oilsep is already at 100ml. It must hold 200ml or so if the precharge is that high. I'm emailing them and will see if that's information I can get ahold of, then maybe it can be used as a point of reference for other oilseps.

You'll always see a certain amount of variation in a system even without an oilsep as the required amount and the prefilled amount for any compressor are different since they include the average system oil requirement, but keeping things to a happy medium will certainly assure max system lifespan.

Will see if they can provide the info or not, will post it here if they come up with it.

Gray

kayl · 11-28-2006, 05:53 PM

id say buy one and see how it goes. it should say on the oil sep how much oil to add.
If the return effects temps, ya can add a small capillary line line feed after the larger fitting to make it return oil smoother and not effect suction line pressure too much.
I used a 1/2" one as well, this one

https://pgw100.portal.gases.boc.com/...Separators.asp

it says Safe working pressure 3,500 kPa, (507 psi) for 3/8 - 1 1/8 Connection so i would expect similar pressure rating with yours.

godmod · 11-29-2006, 02:32 AM

i'm using the smalles one in my cascadeand till now i works fine. you will have to precharge it, but the amont of oil to precharge is on the label.