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Also, fewer moving parts than the vilter 440/450 compressors. Been taught how to replace shaft seal and did 1 alignment.
Sorry for the long post, but it really boils down to knowing what you need for your refrigeration and then backing into the strategy that is going to be the best. A friend who works for a competitor just installed a bunch in a meat plant running 407a..the motors were run off yaskawa vfds.
This is usually remedied by running the compressor, but can require replacement if problem persists.
Most times its just a matter of letting it die and throwing a new one in.
If you don't get it correct it'll take out your shaft seal shortly. If you're handy, work in house and have the time then I say yes definitely as if they're installed and set up properly they'll run for years.
The reason that there's not a lot of them around anymore except in ammonia is that we're a throwaway society now.
My instructor told us that open drive systems ALWAYS leak around the shaft seal and that is why hermetic and semi hermetic are better.
In your experience, is this actually as big of a problem as I was led to believe?
Open drives, of course, are the original design dating back to the early days of York and Frick.