Compressor overheating and shut down???

[rocket600]

system had a leak fixed the leak and charged unit up. At first the compressor turn on and off, Then i opened the main disconnect and restarted it, Compressor turned on and was making a funny noise then stop making the noise, ran for a couple of minutes and then shut off, At the touch of the compressor it was hot. now compressor will not run?????



History on the unit: hasnet ran in couple of months its a cold room 404A, I barrowed the compressor overload when the unit was unoccupied, to replace a cold room that burnt out its overload, order a new and then installed it back to the compressor wired it the same as the others, charged the system up 22lb of 404A liqiud, and started the unit and now compressor isnt running ????

[McLean Air]

We are going to need alot more info than that.

[2sac]

Soiunds like its broken

[rocket600]

We are going to need alot more info than that.

what kinda of info ?

[rocket600]

Had voltage going to the compressor and ohm out the compressor windings seem good.... even when compressor is off the block warms up...

[McLean Air]

3 phase? Amps? Semi herm? What do your pressures look like when it does run? Why did the old overload fail? What kind of overload? Did you pull a good vac? Did you weigh in a charge? Why 22 pounds of 404? Receiver?

[slctech]

Part winding start?

[smjrusche]

I would Chk my voltage, everything you said leads me in that direction. It could be under, over or you've lost a leg and single phasing. A blown fuse or bad breaker will do this every time. Good luck.

[HuNGRYTeCH]

I would Chk my voltage, everything you said leads me in that direction. It could be under, over or you've lost a leg and single phasing. A blown fuse or bad breaker will do this every time. Good luck.

It sounds like a power problem to me as well. Other things could be a large voltage drop on the contactor or disconnect, loose connection, short to ground, or you didn't wire the new overload correctly (I would recommend wiring it as the manufacturer specifies, not how the other ones are).
The fact that you can not get it to run now period is a reason for concern. I would recommend being very confident in all your electrical before you attempt to start it again.

[hewitt]

Did u check capacitor

[rocket600]

Wired to specs, Contactor chatters a little but its pulled in, got voltage out of the contactor and into the overload and the compressror windings, Compressor trys to start and heats up...

[rocket600]

Compressor has been down for a couple of 4 months,

[valdelocc]

My guess would be, you liquid charged it too fast washing away the oil and bearings seized up, the funny noise was the liquid refrigerant slugging the compressor, by the time it stopped all the oil was gone.

[R123]

My guess would be, you liquid charged it too fast washing away the oil and bearings seized up, the funny noise was the liquid refrigerant slugging the compressor, by the time it stopped all the oil was gone.

X2

[whiteside2831]

X2

X3

Contactor chattering, you sure its not single phasing?

[valdelocc]

X3

Contactor chattering, you sure its not single phasing?

I think is a single ph unit cause the external overload, chattering could be due to the locked compressor drawing high amps trying to star and voltage taking a dive. with the limited info provided everything is a guess.

Rocket, try reversing star and run, turn it on and hit it hard with a 2X4

[hcong]

My guess would be, you liquid charged it too fast washing away the oil and bearings seized up, the funny noise was the liquid refrigerant slugging the compressor, by the time it stopped all the oil was gone.

If it isn't an electrical problem, I would agree with valdelocc. Check your refrigerant charge. Also the problem could be contamination in your refrigerant line. Check your filter/dryer, if your refrigerant is entering the compressor with contaminates or still in liquid form then that is bad for your compressor. Not enough refrigerant in your compressor could be causing the overheating.

[Alitakjack]

Write this down-ALWAYS check your power coming in. Then check the contacts on the contactor and power at the motor (compressor). Also never run anything that is over RLA. Also when it stopped what did it stop on? Thermal overload or phase monitor? A safety or did a winding burn apart? What kind of compressor? Ohm out windings. Lost a leg on the 3 phase? Is it 3 phase? More info=better answers.

[rocket600]

Yes it is 3 phase, What i think happen is that flooded the compressor on start up and cooked the compressor bearings, i am going to pump it down. realse the pressure and open the head. I wish it was an electrical problem but seems like i am going to have to replace the compressors maybe??? , compressor tries to start but doesnt crank over.

[valdelocc]

Yes it is 3 phase, What i think happen is that flooded the compressor on start up and cooked the compressor bearings, i am going to pump it down. realse the pressure and open the head. I wish it was an electrical problem but seems like i am going to have to replace the compressors maybe??? , compressor tries to start but doesnt crank over.

have you try reversing the rotation?