Introduction: A mineral-oil screw compressor can be retrofitted to POE, but the job succeeds on moisture, residue, refrigerant, and bearing protection—not viscosity alone. When a screw compressor has run mineral oil for years, a simple 170 cSt match is tempting. The oil cooler, separator, pipework, and rotor housing can hold mineral oil residue long after the drain plug stops dripping. Add R134a, POE moisture sensitivity, and the need for reliable oil return, and the retrofit becomes a cleanliness and moisture job as much as an oil choice. Before requesting an Emkarate RL170H equivalent oil proposal, confirm the compressor model, original oil, refrigerant, moisture status, and package size. Why Mineral Oil to POE Retrofits Need More Than a Viscosity Match A 40°C viscosity check is still the first filter. RL170H is a synthetic POE refrigeration oil with a 40°C viscosity of 170 cSt and a 100°C viscosity of 17.0 cSt. Those numbers sit close to the working range many screw compressors ne...
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