Trane RTAAA904Y issues
Kennesaw State here again,
We have one of these beasts here...issues after issues with A and B compressors. We have been expereincing this unit with CKT A shutting down on low ambient temp, CKT B is now going off on high and low oil temp.
CKT B condenser fan is staging out of sequence with a head pressure of 370psi for 5mins. Oil is 170 degrees, and tripping circut intermitantly.
Anyone else having issues with this species of Trane air cooled? Thanks for any help, and your time by looking.
Originally Posted by SilverWolf
failing sensors, dirty condenser coil, could be lots of things.
if the fans are staging out of order, then the wiring has been messed with.
lots of work in your future.
Someday, I hope to be just as brave as Harry Stamper.
could be somebody altered some settings in menu 5
ONE SMALL CHIP IS AVAILABLE IN TRANE FOR(RTAA)MODEL WHICH CAN FIX IN CHILLER MODEL TO MAKE MAKE PROPER TIMING FOR FAN STAGES AS PER COMP LOAD V/S PRESS.
IT IS SIMPLE MODIFICATION .LITRETURE AVAILABLE IN TRANE.
Yeah, but you know what
A couple of responses are confusing- A RTAA090 has a clear lang. display and no menu 5 as the RTAA140's and up do. You would have to go into the start-up settings if you wanted to change low ambient, by the way that won't make a difference as that is for machine shut down (total) in cold ambient, not just circuit A or B. The fan chip is also for the larger RTAA's. Not the RTAA070-RTAA125's. Depending just how long this machine has been in service would determine next course of action.-GEO
Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO
sounds like your temp sensors need some attention. as for the low ambient c/o, whats it set at?that can be set at the control panel if u know how to read a manual.
Are your Coils clean? and I mean really clean, not just half "A" hosed out. With oil temperature problems, that would be the first thing I'd look at.
BTW For air cooled these are the best Chillers out there IMO. You've got to do the Maintenance on them, that's coil cleaning, contactor inspection, Aux. contact replacement, turn downs, including the compressor terminals, inside the terminal box should be cleaned. Also check your condensor fans, on some models they Daisy chained two motors off one contactor, you could be drawing amps and one fan is DOA.
I only have to make it work till I retire.
If Im not mistaken the ambiant sensor plays a role in fan staging and may be the cause of all your problems