Trane RTAA Phase loss

[chill bill]

Hi,
Have a Trane RTAA 270 (1997) model, controller is the old adaptive control blue screen with four square buttons, up/down/st.pt down and st.pt up. Comp's A & B running fine, but comp C tries to start, then fails immediately on phase loss. The start contactor not even pulling in. Have checked all phases, resistance through contactors, all o.k. C.T's resistances o.k. The oil pressure switch is made. 115v comes from module board on start up, but that's all. Fails immediately on start-up. Anyone have any ideas? Thanks.

[servicetrane]

check the starter auxiliary contacts they give the boot confirmation falsify interpreted as a phase loss

[R123]

Does this chiller have a y-delta starter? If so, check the auxiliary contacts on the contractors.

[chill bill]

Hey Servicetrane,
Thanks for the tip. Was looking at the contactors, but not really at the auxillaries. Checked them out and sure enough, welded aux. Thanks for your help. Sorry about the late reply. Cheers.

[mustafaali]

i have rtaa trane chiller and the compressor is part winding and it is fail imidetly even checked for compressor winding,contactor,curent ct all are o.k so waht could be the fault

[R123]

Mustafaali,

You should start a new thread and you'll get more responses. You also need to give more info. You can't just say "compressor fail, what could it be?". Were not there looking at it. Post exactly what it's doing, what alarms it's calling out, how long it runs, does breaker trip, etc.

[anthonyac1]

put on a hard start kit

[jayguy]

put on a hard start kit

i would like to see how big that kit would be!

[Healey Nut]

put on a hard start kit

Its three phase remember , you will need three hard start kits , dont cross the phases on the hard start kits !!!!!!

[R123]

Its three phase remember , you will need three hard start kits , dont cross the phases on the hard start kits !!!!!!

I heard Trane is coming out with a 3 phase hard start kit specifically for the RTAA!

[jayguy]

Its three phase remember , you will need three hard start kits , dont cross the phases on the hard start kits !!!!!!

wait a minute Igan, you said crossing the streams was bad! - Ghostbusters

[mustafaali]

Mustafaali,

You should start a new thread and you'll get more responses. You also need to give more info. You can't just say "compressor fail, what could it be?". Were not there looking at it. Post exactly what it's doing, what alarms it's calling out, how long it runs, does breaker trip, etc.

R123
i checked the winding by meggar test and found its ground and i have anther compressor runing Amps 20 and making noisy

[R123]

What is your meggar reading? Did it blow the fuses or trip the breaker? Did you check the terminal plate?

[mustafaali]

Hi,
Have a Trane RTAA 270 (1997) model, controller is the old adaptive control blue screen with four square buttons, up/down/st.pt down and st.pt up. Comp's A & B running fine, but comp C tries to start, then fails immediately on phase loss. The start contactor not even pulling in. Have checked all phases, resistance through contactors, all o.k. C.T's resistances o.k. The oil pressure switch is made. 115v comes from module board on start up, but that's all. Fails immediately on start-up. Anyone have any ideas? Thanks.

i have also the same chiller traa213 with tow circuit and one circuit runing and anther give that phase loss i take around 3 days to get the fault at the end found that the compressor protacting module board is defictev when i replaced from another chiller which working ok