Refrigeration & Air Conditioning Mechanic Red Seal · Question
A customer complains of poor cooling from a small commercial refrigeration unit. The technician finds the evaporator coil partially iced over and the suction line sweating heavily, indicating liquid refrigerant is returning to the compressor. What adjustment should be made to the TXV?
Sweating suction line and iced evaporator suggest the TXV is overfeeding, meaning superheat is too low. Closing the valve (clockwise adjustment) increases the s
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Question: A customer complains of poor cooling from a small commercial refrigeration unit. The technician finds the evaporator coil partially iced over and the suction line sweating heavily, indicating liquid refrigerant is returning to the compressor. What adjustment should be made to the TXV?
Answer options: ✅ Close the TXV (turn stem clockwise) to increase superheat.
- Open the TXV (turn stem counter-clockwise) to decrease superheat.
- Replace the TXV's sensing bulb.
- Add more refrigerant to the system.
Correct answer: Close the TXV (turn stem clockwise) to increase superheat.
Explanation: Sweating suction line and iced evaporator suggest the TXV is overfeeding, meaning superheat is too low. Closing the valve (clockwise adjustment) increases the superheat by reducing refrigerant flow, preventing liquid return.
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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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