Refrigeration & Air Conditioning Mechanic Red Seal · Question
A 'pump down' cycle is often used on systems with:
A pump-down cycle is typically used with TXV systems that also have a liquid line solenoid. The solenoid closes, allowing the compressor to pump refrigerant out
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Question: A 'pump down' cycle is often used on systems with:
Answer options:
- Capillary tube expansion devices ✅ Thermostatic expansion valves and a solenoid valve in the liquid line
- Flooded evaporators
- Open-drive compressors
Correct answer: Thermostatic expansion valves and a solenoid valve in the liquid line
Explanation: A pump-down cycle is typically used with TXV systems that also have a liquid line solenoid. The solenoid closes, allowing the compressor to pump refrigerant out of the evaporator and into the condenser, preventing refrigerant migration during the off-cycle.
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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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