Bitzer’s patent pending Advanced Header Technology (BAHT) for uneven scroll compressor tandems and trios provides new opportunities for OEMs designing their next-generation systems. Taking advantage of the unique design characteristics of the ORBIT Series compressors, including an isolated oil sump design and good miscible Polyvinylether (PVE) oil, Bitzer’s ORBIT Series has exceptionally low oil carryover rates, the company said. The Advanced Header Technology then operates by ensuring that small differences in pressure drop in header tubing does not impact oil balance between compressors in low mass-flow situations like those found in many air-to-water heat pumps.