Trane unit not working

[lh12345]

I have a Trane 3 1/2 ton residential TTB042D100A unit. It stopped working suddenly and trips the breaker immediately on start. :confused:

I measured the resistance on the compressor, I get 1.0 OHM from start from S-R and S-C and .03 OHM from R - C on the wiring diagram. Is this a shorted compressor? The capacitor looks intact and not bulged.

I don't know what the winding resistance should be, but the fan is around 25 OHMS.

Is there any hope for this? There may have been a powersurge around the time it died, other things in the house failed as well.

[chillin out]

Try disconnecting each part in turn to find the fault.

Chillin:):)

[lh12345]

Try disconnecting each part in turn to find the fault.

Chillin:):)
Thanks. The resistance measured was at the sealed compressor. The only other thing there is the capacitor.

[nike123]

I have a Trane 3 1/2 ton residential TTB042D100A unit. It stopped working suddenly and trips the breaker immediately on start. :confused:

I measured the resistance on the compressor, I get 1.0 OHM from start from S-R and S-C and .03 OHM from R - C on the wiring diagram. Is this a shorted compressor?

It looks like it is!

[Tesla]

Hi lh 12345
Yes your run winding is shorted. If you disconnected all wires to comp and measure 1, start - common, then run - common, add both resistances and they will equal the resistance measured 3, start - run. 0.03 ohms is a dead short on the run winding. I would expect for a dome comp the run winding around 5 - 10 ohms and start 1.5 - 3 times the resistance of run winding. When I was a boy I built a DOL (direct on line ) tester for testing dome compressors, be aware of internal protection (current/temp) on some domes which require upto 6 hours with power disconnected to reset.

[lh12345]

I measured it 24 hours after power was cut. The weird thing is its not shorted to ground, so I figured there is hope. I assume the insulation burnt off and the windings are now touching :(. Can a powersurge do this damage?

[Lowrider]

A burn-out is more likely. Could be caused by acid in the oil due to moisture.

To be sure you would have to test the oil.

[arazakperliya]

Let me Know U located in which country Which breaker is tripping off
Disconnect all compresor terminal wires and check wether Breaker is tripping or not

[arazakperliya]

Winding burning due to Electrical and Mechanical problem Check Voltage while operating.
Check refrigerant flow,Check s.heat,check polarity

[gary29]

your start winding should be 3 to 6 times greater than your run winding. compressors bad:D