TRANE CGWD030 chiller startup

[ctruj]

We bought a used TRANE Chiller model CGWD0304CEONAT101FFBUH6; S/N U91K06943.

It is a 30 ton two unit scroll water cooled Chiller with microprocessor control built in '91.

I am having trouble in getting the chiller to start. All pressures and temperatures seem to be ok. The sequence starts with A88, A00, A01, and A70 (which is normal), but it doesn´t continue. When I scroll the display I find a blinking bE6 alarm that doesn´t reset (phase or power up).

Any suggestions?

Thanks

Carlos

[bku46]

Did you check for proper phazing ? must be correct on scrolls.

[chillrdude]

bE6 is either phase loss or phase reversal, put a phase meter on it and see what you have.Call your local Trane office and ask them for a copy of CGAD-SB2

[maxster]

put guages on one circuit and bump the contactor to see the pressures,if your not getting even a start from A70 the transformers arer reading their primaries out of phase.what that is if you look at the line voltage print L1...L2 main control TR line /115V secondary 1T2.the next 1T12 is the other 2 legs of the 3 phase into the uit L2...L3,check all your panel fuses,but if at first test the compressor is running backwards change the disconnect feed on the T side outside the unit or the line side of the block or CB disconnect unit mounted..."nothing below" the block or CB disconnect that is exposed when the panel is closed.

[maxster]

and another item is don't flip the T sides of the compressor if they are running backwards that willn't solve the UCM from reading a phase fault...maybe it is just a secondary fuse or one of the sub-voltages on the multi TR.

[ctruj]

Thanks, guys,


Ill check and let you know.

[ctruj]

I bumped the contactor and the pressures are ok. The compressors are running in the right direction. But I still get the bE6 alarm. What else can be wrong?

[maxster]

did the unit come in complete,as from fatory if a generic transformer might of been replaced the secondary might be backwards,check all your sub-borrd and check the ribbons for rub outs within the stack behind the 1U1.i will put up readings on that multi-secondary TR latter for you to checkout.

[maxster]

this drawing is what senses the correct phasing on start,if L1 and L2 are tapped correctly and L2 and L3 to the other TR then it is something after the secondary connection,pin... the boot....or the board itself that the secondary goes into.not to be doubting your checking at all ...but are all your dip switches set for the correct voltages,CTs and compressor stages.after this i would just repin each board per cicuitthe 1T2 is the one with all the low voltage secondary readings and the 1T12 is the line primary/and 115V secondary,sorry.also keep in mind that the LLSs are 13VDC and that is the click you hear on timed out start,if you have the rocker in the stop/reset position and want a "no timed start up" hold the advance button in and go up to auto/remote then to auto/local and let off the advanced button and the chiller will stage-up to all compressors as long as there is a good temp return and the safties aren't effected by the full tonnage call.i am digging for all those secondaries readings on that 1T12..hang in there!

[Edited by maxster on 09-07-2004 at 06:23 PM]

[ctruj]

I still get the bE6 alarm. All the voltages of the transformers are correct, and their connection doesn´t seem to be altered.

Is there a way that I can diagnose that there is a problem with one of the cards?

Thanks,

Carlos

[roxy]

ctruj,
Look at CGAD-SB-2B on pages 5 and 18 for some tips on the E6 diagnostic. If the transformers are providing power to the A6 then you need the service bulletin to troubleshoot this problem. If your UCM is version E you can disable E6 with a DIP switch change.

[ctruj]

By the way, where can I download the manuals/service bulletins for this unit.

[rob10]

Is your flow switch proving flow?