Refrigeration & Air Conditioning Mechanic Red Seal · Question
During a routine maintenance check, a multi-stage refrigeration rack system is found to be consuming 25% more power than expected for its current load, and discharge temperatures are elevated across multiple compressors. The suction and discharge pressures appear within acceptable ranges. What is the most probable system inefficiency?
Non-condensable gases elevate the compressor's discharge temperature and increase the work required per refrigerant mass handled, leading to higher power consum
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Question: During a routine maintenance check, a multi-stage refrigeration rack system is found to be consuming 25% more power than expected for its current load, and discharge temperatures are elevated across multiple compressors. The suction and discharge pressures appear within acceptable ranges. What is the most probable system inefficiency?
Answer options:
- Leaky defrost heater elements
- Failed condenser fan cycling controls ✅ Non-condensable gases in the system
- Dirty condenser coils on multiple circuits
Correct answer: Non-condensable gases in the system
Explanation: Non-condensable gases elevate the compressor's discharge temperature and increase the work required per refrigerant mass handled, leading to higher power consumption even if manifold pressures appear relatively normal. It affects the overall system efficiency without necessarily causing obvious pressure abnormalities initially.
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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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