Refrigeration & Air Conditioning Mechanic Red Seal · Question
When performing a leak check on a refrigeration system using nitrogen, what is the safest maximum test pressure commonly used for typical HVAC/R systems?
While specific pressures vary, 150-200 psig is a common and safe maximum test pressure for leak checking with nitrogen, avoiding over-stressing components.
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Question: When performing a leak check on a refrigeration system using nitrogen, what is the safest maximum test pressure commonly used for typical HVAC/R systems?
Answer options:
- 50 psig ✅ 150 psig
- 250 psig
- 500 psig
Correct answer: 150 psig
Explanation: While specific pressures vary, 150-200 psig is a common and safe maximum test pressure for leak checking with nitrogen, avoiding over-stressing components.
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Question explanations
- 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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