pump down the air-con unit

[ksm]

Dear all,

To pump down the precision air-con unit,the liquid line shut-off valve need to close before compressr start or after compressor start? Which one is the correct method?

Please advise,thanks!:)

[sedgy]

ksm , the correct method would be suction gauge ON< valved off< then its up to you ? have you done this before?= sedgy

[stufus]

After comp start allow system to stabilise first.
Cheers
Stu

[ksm]

Thanks Stufus!:)

[ksm]

Yes,Sedgy.if i close the valve before compressor start,the noisy sound came out from compressor valve when compressor start.Thanks!

[sedgy]

hi ksm , noisy ? then it looks like a internal problem with comp =sedgy.