desA
17-12-2009, 01:26 PM
I've got a small unit - approximately 700x700x750mm, with a single scroll compressor (rubber mounted on factory-supplied mounts), fan mounted onto the casing (box front) - no rubber mounts.
I'm getting a small niggling vibration that seems to work its way towards the rear of the unit. It seems to rise up in level, then drop off. I've listened to the compressor - nothing out of the ordinary. Touching the piping seems to show the vibration coming off (or onto) the discharge line, & tracking down two long, thin service ports.
I've a keen ear & hate a vibration, no matter how small - it's not a lot - just irritating to my ear.
What I had thought about was fan-to-compressor interaction eg. beats, where the frequencies are coupling at times to track through a vibration. The other alternative is a check valve in the discharge line - mounted in a vertical upleg - 180 degree loops bottom & top - some 300mm away from check valve.
Another thought was to add mass in the right places. I've seen rubber mass dampers installed on the suction line of rotary compressors, for instance.
I'd appreciate advice on how to track down the real origin of the vibration & simple ways on how to solve it.
I'm getting a small niggling vibration that seems to work its way towards the rear of the unit. It seems to rise up in level, then drop off. I've listened to the compressor - nothing out of the ordinary. Touching the piping seems to show the vibration coming off (or onto) the discharge line, & tracking down two long, thin service ports.
I've a keen ear & hate a vibration, no matter how small - it's not a lot - just irritating to my ear.
What I had thought about was fan-to-compressor interaction eg. beats, where the frequencies are coupling at times to track through a vibration. The other alternative is a check valve in the discharge line - mounted in a vertical upleg - 180 degree loops bottom & top - some 300mm away from check valve.
Another thought was to add mass in the right places. I've seen rubber mass dampers installed on the suction line of rotary compressors, for instance.
I'd appreciate advice on how to track down the real origin of the vibration & simple ways on how to solve it.