We discussed the design of Bitzer’s CO2 compressors and review the components inside. We talked about the motors and the pressure ratings for Transcritical compressors and subcritical compressors. We talked about the importance of minimum superheat with CO2 compressors. More and more compressors are running into issues because technicians do not know or understand the solubility of CO2 refrigerant and POE oil. It is different then with HFC refrigerants and CO2 does not carry POE oil the same way. The viscosity is totally different with CO2. You need to understand when you are running a 20F/11K superheat that is too low and you can potentially start to running into lubricating issues.
We talked about discharge superheat and why that is important to know that when your discharge superheat is very low. Phil mentions you can run into lubrication issues even if you have superheat at the inlet of the compressor if you have low discharge superheat.
We learned about the many different electronic components like the IQ module and how it is a game changer for Bitzer compressors. You can now connect to the compressor via Bluetooth and monitor the compressors health.
We discussed the importance of capacity control using VFD’s on Bitzer CO2 compressors. How to set them up and troubleshoot them. Why as technician, we need to really learn how they work, how to program them and why you are seeing them as the lead compressors.
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