Results 27 to 34 of 34
Thread: RTAA 1254 trane chiller
11-14-2009, 06:37 PM #27
11-14-2009, 06:50 PM #28
can't find my RTAA class notes on this...but if i remember it right...
RTAA-SB-9, page 10-27
the J3-1 and J3-2 inputs on the compressor module are jumpered because they originally had on oil pressure switch input and it was these 2 inputs but they never went with it. legend has it that trane was going to have the "new" boards (UCP2 style) available for the older UCP1 units (130 tons and larger) and that never happened but they still had all of the old compressor info in the programming.
for the UCP1 units: diagnostic 1A5 is "Oil Flow Control - compressor A" which is where the unit is looking for the open switch at shutdown. it appears that they even moved the old diagnostic codes over to the UCP2 in programming...which begs the question...could you convert a UCP1 control system to a UCP2? it appears that with enough digging you might...but i never told you to do that.The weak aren't destroyed by the strong.
The weak are destroyed by the under-estimated.
I know a famous song that ends in 'my nose'. The artist is dead. Know who?
11-15-2009, 11:38 AM #29
Funny you mention that Jay, after reading the these threads, I thought the same thing. I've never had anybody screw (no pun intended) around too much with the machine configuration, to where you'd get to that point. I had a 150 ton RTHB think it was a 300 ton, power outage wiped the chiller mod. tripped on alot of crazy faults, before resetting the field-s/u & machine configs. Fun stuff. Good brainstorm on this one.
Last edited by txhvac; 11-15-2009 at 05:36 PM.Sic Semper Tyrannis.
11-15-2009, 03:09 PM #30Professional Member
- Join Date
- May 2006
- N.E. IA
Still can't sleep, thinking about you, Dave. Hope you verified ALL the configuration points AND dip switch settings to make sure they are all set to the right points for the machine you actually have.
Anyway. I don't think anyone said: "Welcome to the club". You brought up a good situation to start and precicely spelled out the problem ( though it took us old-farts a while to recognize that). Hope you keep contributing to our discussions."Wheel" mechanics work on "Wheel" chillers
11-16-2009, 12:30 AM #31Regular Guest
- Join Date
- Nov 2009
Thanks again. Thanks for the welcome and I will be active in the discussions. Maybe even help someone myself or learn more on some crazy fault codes..... By the way Chiller still running good.
09-28-2010, 09:03 AM #32
09-28-2010, 10:45 PM #33
If you get in the habit of logging the setpoints and settings in using the log sheet in the IOM, in addition to logging the running info, even the most minute changes to the unit setup jump right out at you once you put it on paper.
There's a spot on there that says "compressor model no. prefix" and "compressor tons"Truth is still truth, even if no one believes it. A lie is still a lie, even if everyone believes it.
"It's called the american dream because you have to be asleep to believe it" -George Carlin
"A nation of sheep begets a government of wolves" -Edward R. Murrow
"I have problems just like you. One time, my dancing horse almost fell into my car elevator" -Mitt Romney
Buy american made goods & support locally owned businesses!
09-28-2010, 11:07 PM #34
100 % true., great advice