Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is troubleshooting a commercial freezer maintaining a higher-than-setpoint temperature. The refrigerant sight glass is showing bubbles, and the discharge pressure is normal while the suction pressure is slightly low. What is the probable issue?
Bubbles in the sight glass with a slightly low suction pressure and normal discharge pressure are classic indicators of a refrigerant undercharge. This reduces
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Question: A technician is troubleshooting a commercial freezer maintaining a higher-than-setpoint temperature. The refrigerant sight glass is showing bubbles, and the discharge pressure is normal while the suction pressure is slightly low. What is the probable issue?
Answer options:
- Restricted return air filter
- Defective evaporator fan motor ✅ Refrigerant undercharge
- Non-condensable gases in the system
Correct answer: Refrigerant undercharge
Explanation: Bubbles in the sight glass with a slightly low suction pressure and normal discharge pressure are classic indicators of a refrigerant undercharge. This reduces cooling capacity, leading to warmer box temperatures.
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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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