Original message
| hatrabbit
 |  "Hi discharge pressure/low oil pressure"
, posted Tue 30 Jan 00:44  
Hello people... I noticed an interesting thing on 2 of my chillers. One is air cooled, the other water cooled. The air cooled one shut down by the oil pressure safety, inspection shows the condenser coil is dirty. Today the water cooled chiller shut off on low oil pressure, and I found the cooling tower fan motor starter had failed. Have any of you heard of a relationship between high discharge pressure and low oil pressure?
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Replies:
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| THE BUTCHA
| "Re(1):Hi discharge pressure/low oil pressure" , posted Wed 30 Jan 22:25
YES THERE IS A REASON THIS WOULD HAPPEN AND ITS NOT DO TO OIL PRESSURE DROP. ITS DUE TO THE COMPRESSOR TRIPPING OUT OVER HEATTING AND SHUTTING OFF , ON THE OVERLOAD. THE CONTACTOR WILL STILL BE PULLED IN AND THE OIL SAFTEY CONTROL WILL BE POWERED AND WILL NOT SHOW OIL PRESSURE DO TO THE COMPRESSOR NOT RUNNING.
THE BUTCHA
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| hvaccur
| "Re(1):Hi discharge pressure/low oil pressure" , posted Thu 22 Feb 18:32
you are probably asking about an RTAA/RTAC and yes there is an oil shut down with head pressure problems such as dirty cond.
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| Antonetz
| "Re(1):Hi discharge pressure/low oil pressure" , posted Thu 15 Feb 09:48:
your problem could be explained, but not entirety, nor might not be your source of defectiveness, oil viscosity is affected by high temp's & pressures. this could affect oil lubercation & pressure at oil pressure safety switch of your chillers, locking out on oil safety but i would have thought it would have shut down on hi-pressue 1st, which leads me to think there are some oil issues, check your oil level, shut down & running modes insuring proper levels, check oil pressures during operation, and insure they are right, insure you have proper pressures at start-up, if not right system will shut down after 2 to 5 min. depending on manufacture. check oil filters & pump for proper operation. hope this can shed some light on operation. chillers are an expensive piece of equipment and problems should not be taken lighty. there should be gages so to monitor oil pressures if not recc. installation. let me know if this was of any assistance. antonetz r.p.
R.P.Antonetz
[this message was edited by Antonetz on Thu 15 Feb 09:58] |
| chiller guy
| "Re(1):Hi discharge pressure/low oil pressure" , posted Thu 8 Feb 13:33
This is interesting! What brand chillers and what type of compressors (recip,screw.scroll)?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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