I would start w the DP switch., oil filter., clean condenser coils., and charge.,
good luck
I have read and lurked here for a while before posting for help. Background on the unit is 220 ton chiller system 1998 vintage with dual screws. The unit is intermittently shutting down either circuit A or B from time to time with no rhyme or reason and it never acts up while I'm onsite to catch it. Right now it's 83 degrees here and dropping to 60 or so at night. Sometimes it will go for days perfectly without a problem.
All condenser fans are running correctly operation verified
25lb of pressure drop across both circuit oil filters
UCM has updated program and OAT sensor installed
Oil level is spot on in both oil coolers
All electrical connections on oil DP switch have been verified
Compressors are starting at 40% load and then modulating up to around 70%
Condenser is visibly clean but I'm going to wash it out tomorrow to get a baseline on it.
I have not physically tested the oil pressure DP switch's yet.
But when it was 112-114 degrees this summer it ran like a top without a problem it's only once the weather cooled off in the last month these stinkin little gremlins are showing up. thanks for the help and any ideas are appreciated.
I would start w the DP switch., oil filter., clean condenser coils., and charge.,
good luck
no signature blast'em man blast'em
!!!KILL THE TERRORIST!!!
If you had gone ahead and done these two things, it probably wouldn't have PO'ed graham for you to start this thread. As it is, he's probably choking on his beer right now and trembling too hard to type in his response.
I'd get these two items out of the way before doing anything else. Post your actual numbers on everything if you have to call back........
You can also find endless hours of reading on this subject and all of it's nuances simply by doing a site search on it.
10-4 I'll wash it and post up some numbers tomorrow. Thanks for the help.
AAAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
f%%%%%%%%%%%########$$$$$$$$$$**********&&&&&&&&&& &???????????????? not anothing friggin RTAA oil code post .!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!
AAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Wheres my gattling gun Im goin Postal !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
You bend em" I"ll mend em" !!!!!!!
I"m not a service tech, I’m retired ….I used to be a thermodynamic transfer analyst & strategic system sustainability specialist
In the new big shop , greasin', oilin' . tweakin' n shinin' !!
How does the UCM logic work regarding this safety. While running it is looking for a minimum 50 lb differential and the contacts are closed. Does it test the integrity of the circuit in any other manner during operation and or shutdown process.
I don't have a clue what conditions are present when the failure is actually happening to determine if it is during system run or start up or some combination between.
Sure would be nice if it had freeze frame diagnostics like car control systems do.
All the UCM is doing, regarding this fault, is look at the DP switch contacts. If it opens, it calles out the fault. The DP switch should be set at 50 PSID + or - 5 (i set it at 55). Upon shutdown, the UCM closes the master oil solenoid valve and looks for the DP switch to open to test the integrity of the switch.
Everything about it looks stone stock. We'll give it a good bath and scrub behind the ears double check the pressure switch's and see what happens. I had a hunch I just wanted to hear someone else's opinions to back up my hunch. Thanks again.
'WAS' is right! now Graham is the nicest Trane guy!
check your oil pressure switch 'X' number...if it ends in '03' or '-03'...change it out as they tended to drift over time.
perform a very thorough checkout of the oil solenoid coil. if it is overheating or occasionally dropping out (bad wire nuts?) then this will cause the pressure switch to trip and of course, check out the pressure switch.
the foaming around Grahams mouth isn't from the beer!
"Right" is not the same as "Wise".
Don't step on my favorite part of the Constitution just to point out your favorite part.
Just because you can measure it, doesn't mean it is important. Just because you can't measure it, doesn't mean it isn't important.
The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
You bend em" I"ll mend em" !!!!!!!
I"m not a service tech, I’m retired ….I used to be a thermodynamic transfer analyst & strategic system sustainability specialist
In the new big shop , greasin', oilin' . tweakin' n shinin' !!
good times
no signature blast'em man blast'em
!!!KILL THE TERRORIST!!!
Ah what will we all do when all the AA's have passed into the twilight now that Trane has moved on to AC's! It's fun to watch or at least read these responses!
And I have learned alot reading them between the laughs!!
I'm good at making things cold...You can ask my first two wives!
Washed the condenser last night it definitely was way dirtier than it ever looked. The switches tested out when I checked their calibration. The machine ran perfect through the night and all day today. Maybe I got lucky we'll see how it does over the next few days.
The x number on the switch is x1324004040.
Good point!
How many techview questions will it take to before our northern Trane guru has to take his green machine out in December with the top down to cool off.
I'm good at making things cold...You can ask my first two wives!
The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
You bend em" I"ll mend em" !!!!!!!
I"m not a service tech, I’m retired ….I used to be a thermodynamic transfer analyst & strategic system sustainability specialist
In the new big shop , greasin', oilin' . tweakin' n shinin' !!
So far so good today had a few VAV boxes to work on and she ran like a top all day.