Refrigeration & Air Conditioning Mechanic Red Seal · Question
A walk-in freezer using R-407C is exhibiting low suction pressure and high superheat at the evaporator outlet, but the compressor discharge temperature is also unusually low. What is the most probable cause of these symptoms?
A restricted liquid line or plugged filter drier reduces the amount of liquid refrigerant entering the evaporator, leading to low suction pressure, high superhe
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Question: A walk-in freezer using R-407C is exhibiting low suction pressure and high superheat at the evaporator outlet, but the compressor discharge temperature is also unusually low. What is the most probable cause of these symptoms?
Answer options:
- Overcharged refrigerant system
- Non-condensable gases in the system
- Dirty condenser coil ✅ Restricted liquid line or filter drier
Correct answer: Restricted liquid line or filter drier
Explanation: A restricted liquid line or plugged filter drier reduces the amount of liquid refrigerant entering the evaporator, leading to low suction pressure, high superheat, and often a reduced load on the compressor causing a lower discharge temperature.
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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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