Original message
| poncesurfman
 |  "York YT Centrifugal problem......"
, posted Sun 10 Oct 18:16  
I had a smaller yt chiller with a 148 HP motor bearing failure. I simply Removed the motor and had it sent out for service. (rewound/baked/new bearings/etc). Checked my axial thrust while motor and coupling were off. The manual says max of 15 Thousandths, I had 9.5. First question is whats the min on the axial thrust? I cant find that info anywhere. Next when motor came back I installed exactly by the book. I started the motor with coupling diconnected to insure proper rotation and to find magnetic center of the motor. Checked Rim and Face total measurements to insure proper allignment. Set and bolted coupling back in place. Before start up I thought it would be a good idea to set up and check the seal pressure when I started the machine, to insure my 1 1/2 - 3 psi positive seal pressure. When I ran machine I have 5" on my seal And it wont adjust with the relif valve? Has anyone had a seal that was in a negative pressure and would not adjust? Should I change the seal and relief, or is there something im missing? Please leave e-mail with response in case of more indepth questions.
Thanks.......
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Replies:
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| just a mechanic
|  "Re(1):York YT Centrifugal problem......"
, posted Sat 4 Dec 09:33
is this a close coupling or a D flange? i would say your thrust is ok as far as the motor, but the 5 inches on the seal wont work....you need a half pound positive psi or so. i would change the regulator and see what happens. as far as the seal, i would leave it alone if its not leaking excessivly. (which is more than a bottle a month...750ml)
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| Chiller Guy
| "Re(1):York YT Centrifugal problem......" , posted Mon 11 Oct 22:15
First I think the thrust is OK.
As to your seal pressure, how old is the seal? They are only good for about two years and you may have interal "O" rings leaking. When the bearing went out could it have damaged the seal?
You refered to a book for the motor set up. Is it a York manual or motor manual. If it does not list Min thrust spec's don't sweat it.
Since this is a low pressure machine, what were the readings while you were checking the seal pressure. How much load on the unit, oil pressure,evap and cond pressures? How fast are you filling that little bottle (if it's still there)? Try to get a log on the unit under some load and look over all the numbers for something out of sorts.
Good Luck!! They can be a bear.
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| xenos
Webmaster 
| "Re(1):York YT Centrifugal problem......" , posted Sun 10 Oct 20:37
There may be one guy on this site that may have that answer, however here 148HP is not considered small.
Xenos.
The best way to escape a problem is to solve it.
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