Dear all

 I am facing to increasing TAN number for bitzer bse 170 (poe oil)after 2 month   charging new oil with 0.02 TAN increase to 0.2. Lab oil analysis shows high copper wear element . All other parameters were ok. Refrigerant is R134a.pls share your idea .

Best regards 

Original Post

acidity/basicity - for chlorinated refrigerants like Freon or R-22, we recommend running a test for Total Acid Number (TAN). For ammonia-based systems we recommend running a test for Total Base Number (TBN). TAN can affect the miscibility of the lubricant in the refrigerant. page 105

Copper is not a good sign, normally there is a coating protecting the copper, once you find copper bearings are worn


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