Compressor shaking after air conditioner shutting down

[kefah]

hi
i received an old LG heatpump split ac unit
that had leakage because of cracked capillary tube
i cut 1 cm of the capillary then i weld it
made vacuum for 30 minutes then
charged it by weight
and it cool very good
problem is that when i shutting down them unit
compressor keep shaking for sometimes
30 seconds
5 seconds
and sometimes not
what is the problem or that is ok

in this video compressor shake up for 3 second only




http://www.youtube.com/watch?v=jab084i5nLQ

[nike123]

Refrigerant is expanding from high pressure side and turns motor backward until pressure equalize. Faulty (stuck) discharge valve at high side.


http://www.youtube.com/watch?v=soKV3SfKM64

[install monkey]

http://www.ra.danfoss.com/TechnicalInfo/Literature/Manuals/01/DKRCC.PI.FE0.A5.02%20vs.pdf
fit another non return valve on the discharge line- stop the rattlin and prevent pipe fracturing
make sure u fit it the correct way round:D

[kefah]

ok
if i left the unit working at this way
what will happen except rattlin & pipe fracturing

[install monkey]

more repairs, and more posts on here!:o

[kefah]

ok
the solution installing discharge line check valve
thank u all