Refrigeration & Air Conditioning Mechanic Red Seal · Question
When retrofitting an R-22-based heat pump system with an R-410A system, what critical change must be made regarding the lubrication system?
R-22 systems typically use mineral oil, which is not miscible with R-410A. R-410A requires Polyolester (POE) oil. Failure to thoroughly flush the system of mine
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Question: When retrofitting an R-22-based heat pump system with an R-410A system, what critical change must be made regarding the lubrication system?
Answer options:
- No change is required, as the oils are compatible. ✅ The system must be flushed to remove mineral oil and charged with POE oil.
- Only the compressor needs to be replaced, not the oil.
- A smaller receiver must be installed for R-410A.
Correct answer: The system must be flushed to remove mineral oil and charged with POE oil.
Explanation: R-22 systems typically use mineral oil, which is not miscible with R-410A. R-410A requires Polyolester (POE) oil. Failure to thoroughly flush the system of mineral oil will lead to oil logging and compressor failure due to improper lubrication.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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