very high oil pressure on Carlyle compressor

[Yuri B.]

Hello
On a 30GX water chiller, a week ago, oil bursted through the o-rings of the oil check valve of a 06N Carlyle compressor, The valve (o-rings) was changed, but the cause of the too high oil pressure was not found.
Outside air temperature is now 17 C, discharge pressure is about 13 Bar, but the oil pressure is going over the limit of its pressure transducer - over 31 Bar (What will be when the OAT is 30C , I don't know).
What may be the cause ?

[serviceman]

measures the pressure gauge to check oil if correct reading of the transducer

[james10]

Change the internal oil filter the transducer is located before the filter if the filter chokes then this can cause high o/p also check the oil pumps

[Yuri B.]

It is an idea that the pump may stay on. but it is so small I doubt it can build such pressure
I think, who wrote the program, concerned with a situation DP - OP (" >340 kPa for more than 6 seconds"), overlooked the possibility of OP - DP >1500kPa for more than a week !

[Grizzly]

Hi Yuri.
You may have something with the pump staying on.
Under normal circumstances the pump only runs as prelube. But can be restarted and will run when the comp is running.
If there is "Low Ambient" or "Low Condenser Loop Temperatures" recorded?
Another thing which may be totally irrelevant?
The oil separator has an internal thermostat that is supposed to turn off at a oil temp of 85c.
Also the oil filter diff calculation uses the economizer transducer for it's calculated oil press diff.
So check that out!
Cheers Grizzly

[Yuri B.]

Thank you guys, I will put here what I may find on Monday (it did not come to my mind to measure the current to the pump while chiller ran )

[james10]

Out of interest has the chiller had any oil added to it for any reason also what phase machine do you have?
Phase1 hsio control
Phase2 prodialog sypnopsis ( black )
Phase3 prodialog sypnopsis ( grey)

[Yuri B.]

Out of interest has the chiller had any oil added to it for any reason also what phase machine do you have?
Phase1 hsio control
Phase2 prodialog sypnopsis ( black )
Phase3 prodialog sypnopsis ( grey)

It has prodialog plus interface/control and it is very possible that we overfilled earlier the system with oil as nobody knows how much there should be. (my first thought also was it is the major reason, but, the oil separator being so spaceous, it should hold much more oil than the compressor may ever need, so, my afterthought was, it could not be the reason. I might be wrong however, am not sure)

[james10]

If you can tell me the full model number of the unit and compressor also which circuit is causing the problem I can tell you the correct oil charge, although the oil sep is quite large the oil level is critical the perjured tolerance is only 1 litre either way

[Grizzly]

Hi Yuri.
The attached may help if you want to drain some oil and then refill as directed.
Alternatively you can take James up on his kind offer of assistance!
Grizzly

[Yuri B.]

Chiller 30GX 122 A0069
Compressor Carlyle 06NA2250S7NA
We do not know neither what the precise charge nor how much oil should be in the both (A 1 compressor, B 1 compressor) systems - nameplate datas are indiscernable.
The mentioned comprerssor is system B (system A has a slightly larger one).

[james10]

Circuit A 60kg R134a 20litres polyester oil carrier spec PP 47-32 (SW220)
Circuit B 57kg R134a 20 litres polyester oil carrier spec PP 47-32(SW220)

[Yuri B.]

Thank you very much James.

[Yuri B.]

Is oil level switch a more or less trustfull indication of the norm? (interestingly, how much oil one, who is filling the empty system, usually add after the switch triggers closed)