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hvacplumb
07-26-2006, 02:19 PM
I have a rtac that is giving me a oil temp alarm i have read the diagnostic in the o&m and it sounds like it could be related to the small load that we have on the chiller.
does anyone have input.
Thanks for any and all input
licensed to chill
07-26-2006, 06:26 PM
is it a high oil temp. alarm or a oil system fault alarm?
hvacplumb
07-26-2006, 08:12 PM
yes it is a high oil temp alarm
cw0682
07-26-2006, 08:44 PM
High oil temp on those units are directly related to condensing pressure. There is also an oil subcooler in the condensor. What is your high side doing when you get that alarm. Is your coils clean , All fans running don't be lazy climb up there and look at them and make sure they are all turning the right direction to.
fixerup
07-26-2006, 09:17 PM
I agree with CW.Let us know what you find.
whitepoundog
07-26-2006, 10:03 PM
Have you witness it? and what is the oil temp?
Healey Nut
07-27-2006, 09:28 PM
RTAC 140 Constant running of an RTAC at minimum load will cause high oil temp diagnostics due to low refrigerant flow. Graham Trane Tech.
hvacplumb
07-28-2006, 10:24 AM
Graham,
I appreciate your input.Is there any more service literature on this chiller that I can aquire.
Merle Wilbur
Service Tech
Bell Helicopter
enart9591
07-28-2006, 02:45 PM
RTAC chillers that run unloaded for long periods of time or have a setpoint of lower than 40 degrees require an oil cooler.

An oil cooler is an option the customer could have purchased. It is possible to order the components to retrofit with an oil cooler if it comes to that.

If the machine has been operating for some time with out this problem occuring, I would suspect other problems.

Are both compressors experiancing the problem?
hvacplumb
07-29-2006, 12:18 PM
I finally crawled up on top and looked .Condensor fans are tied together at motor instead of contactor. Fan spins backwards and I didnt catch it at first.Will post all info when I get motor replaced.Any literature on a rtac besides the O & M manual would be appreciated.
Thanks Guys
cw0682
07-29-2006, 02:29 PM
In response to your request. I typilcally use the IOM manual and the this one Trane Publication rtac-svd01a-en for trouble shooting of the communicating devices.
r404a
02-20-2007, 10:43 PM
It seems like the IOMs are getting less and less indepth. Very vauge. Another MUST have service sheet is RTAC-SVD02B-EN


r404a