About Retrofitting a used diesel air compressor into an oil
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6 FAQs about [Retrofitting a used diesel air compressor into an oil]
Can a VFD compressor be retrofitted?
A suitable compressor for retrofit exists. See the next section. To properly integrate a VFD compressor into a multiple compressor system, the VFD compressor must have a “turn-down” (min-max speed flow range) of more than any of the fixed speed compressors in the system.
Can a centrifugal compressor be retrofitted?
The retrofitted compressor must be a positive-displacement compressor. While it is theoretically possible to run a centrifugal compressor in a small speed range, we don’t recommend it for a retrofit project. The retrofitted compressor must have a known speed range.
What oil do you use in a 57 Nomad compressor?
I am installing a Vintage Air IV system into a '57 Nomad, using the AC Delco 4849 R4 compressor. Originally, GM recommended their 15-118 oil, which is PAG oil at 150 viscosity. However, that oil has been superceded by P/N 10-5040, which is only 46 viscosity. That is a huge difference! Use ISO 150 PAG for Delphi/Harrison H-6 Compressors!
How do I integrate a VFD compressor into a multiple compressor system?
To properly integrate a VFD compressor into a multiple compressor system, the VFD compressor must have a “turn-down” (min-max speed flow range) of more than any of the fixed speed compressors in the system. That allows the VFD compressor to operate as the “fixed trim”, or the unit that is always meeting the varying load.
What kind of oil does a GM compressor use?
GM approved the 46-CSt oil from Idemitsu, the oil supplier to Visteon and reportedly most Japanese compressor manufacturers. The 46 is being used for factory installation on all but*** Delphi compressors***, and GM will be marketing this oil to its dealers. It's the service oil for all GM R-134a systems, except those retrofitted from R-12.
How to save energy in industrial compressed air systems?
As readers of this publication know, there are many ways to save energy in industrial compressed air systems. One common supply side technology is the variable frequency drive (VFD) of the compressor.


