York YK "D" fitted with VSOP.

[brztech]

Hello everybody! I'm troubleshooting a Centrifugal York Millennium YK “D” style, fitted with VSOP. What is happening is: when the equipment is requested to start, during the pré-lub process the oil pump starts and the VSOP output frenquency increase from 25 to 60 Hz, but the oil pressure do not reaches a value of 45 PSID as needed and the compressor start is aborted followed by the “ HIGH OIL FLOW” displayed message. After the VSOP reset, and several attempts, the pré-lub process is completed and the equipment starts. Has anyone ever seen this problem?

[york56]

HIGH OIL FLOW
If either of the following conditions occur, a safety shutdown
is initiated and
DAYTIME-HIGH OIL FLOW
is displayed when the STATUS key is pressed.
a. If the oil pressure is < 40.0 PSID for 5 continuous
seconds during the last 10 seconds of the compressor
pre-lube or during the first 15 seconds of
SYSTEM RUN.
b. If the oil pressure is < the programmed OIL PRESSURE
SETPOINT and the speed command is at
60Hz for 5 continuous seconds, anytime after the
first 30 seconds of SYSTEM RUN.
The “DAY-TIME-HIGH OIL FLOW” safety checks
are not performed during MANUAL SPEED control.
All other oil pressure safety shutdown thresholds are
the same as with the fixed speed oil pump applications.
For both fixed speed and variable speed oil pump applications,
the shutdown threshold for “DAY-TIME-HIGH
OIL PRESSURE is now 90 PSID.

[york56]

KNOWN PROBLEMS
Early version of VSOP drive software did not work
properly with a YORK chiller. To verify the software
version on the VSOP drive, do the following: Open the
enclosure door and look for the VSOP drive in the upper
right hand corner. In the center of the control board,
locate the square chip, approximately one square inch.
On this chip is a label. If the label has C13.XX on it, or
a lower number, the VSOP drive should be replaced.
A few of the VSOP drives have demonstrated a sensitivity
to line voltage disturbances, such that is caused
by the switching of power factor correction capacitors.
These line voltage disturbances cause the DC bus voltage
to exceed a safe limit for an extremely short period
of time. New VSOP drives have a 50 msec. timer placed
on the high DC bus voltage shutdown. If you suspect
this is your problem, verify the software version as stated
in the previous paragraph. The software version that
contains this fix is a C30.2A. These drives will be available
sometime in July of 1999.

[ChillTek NC]

I agree with York56. But whats the speed on the oil pump once the machine is up and running? Anything >35-40 Hz could indicate dirty oil filter, causing greater PD through filter and pump is struggling to maintain oil pressure setpt. But sounds like your machine falls in the category for the VSOP software upgrade.

[brztech]

Hello York56! Thank you for your reply, tomorrow I'm going to check the label chip.

KNOWN PROBLEMS
Early version of VSOP drive software did not work
properly with a YORK chiller. To verify the software
version on the VSOP drive, do the following: Open the
enclosure door and look for the VSOP drive in the upper
right hand corner. In the center of the control board,
locate the square chip, approximately one square inch.
On this chip is a label. If the label has C13.XX on it, or
a lower number, the VSOP drive should be replaced.
A few of the VSOP drives have demonstrated a sensitivity
to line voltage disturbances, such that is caused
by the switching of power factor correction capacitors.
These line voltage disturbances cause the DC bus voltage
to exceed a safe limit for an extremely short period
of time. New VSOP drives have a 50 msec. timer placed
on the high DC bus voltage shutdown. If you suspect
this is your problem, verify the software version as stated
in the previous paragraph. The software version that
contains this fix is a C30.2A. These drives will be available
sometime in July of 1999.

[brztech]

Hello ChillTeK! How are you? Tomorrow I'm going to check this parameter too and come back and let you know, thank you for your clue.

I agree with York56. But whats the speed on the oil pump once the machine is up and running? Anything >35-40 Hz could indicate dirty oil filter, causing greater PD through filter and pump is struggling to maintain oil pressure setpt. But sounds like your machine falls in the category for the VSOP software upgrade.

[york56]

Your welcome.

[RichardL]

With people like York56 & others posting on this site it not only makes me feel great about this web-site but also makes me proud of our chosen profession.
Way to go Yank'.....

[york56]

Thanks RichardL.

[klove]

Dirty oil filter (as was stated by chilltek) and refrigerant saturated oil will cause this issue to come up.

[brztech]

Hello klove! I've changed the oil filter, but no success, the problem is there yet. As York56 stated I've checked the label ship on the VSOP and it is "C30.1B", do you have some info about this VSOP version?
Beyond the oil temperature, what else could be the reason to saturate the oil with refrigerant?
Thanks for your posting.
Regards

Dirty oil filter (as was stated by chilltek) and refrigerant saturated oil will cause this issue to come up.

[york56]

Have you read the last email that I sent you. also there is an upgrade to the VOSP. ( conversion )

[brztech]

Sorry York56, I had not read it yet, I've just read it right now, for any reason it was in the spam box, Really sorry. I really appreciated your feedback, I will ask to our customer to get this new one VSOP to make the conversion.
Thank you very much for sharing your knowledgement, it really makes me grow professionaly.

Have you read the last email that I sent you. also there is an upgrade to the VOSP. ( conversion )