Refrigeration & Air Conditioning Mechanic Red Seal · Question
Which of the following describes the most common sequence for an electric defrost cycle in a medium-temperature walk-in cooler (-5°C evaporator temperature)?
The standard electric defrost sequence involves shutting down the compressor and fans, energizing heaters, allowing for a drain time, then activating fans after
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Question: Which of the following describes the most common sequence for an electric defrost cycle in a medium-temperature walk-in cooler (-5°C evaporator temperature)?
Answer options:
- Compressor OFF, evaporator fan OFF, defrost heaters ON, drain pan heaters ON, fan delay, defrost termination/fan delay thermostat, compressor ON, fan ON.
- Compressor OFF, evaporator fan ON, defrost heaters ON, fan delay, defrost termination/fan delay thermostat, compressor ON, fan ON.
- Compressor ON, evaporator fan OFF, defrost heaters ON, drain pan heaters ON, fan delay, compressor ON, fan ON. ✅ Compressor OFF, evaporator fan OFF, defrost heaters ON, drain pan heaters ON, defrost termination/fan delay thermostat, fan delay, compressor ON, fan ON.
Correct answer: Compressor OFF, evaporator fan OFF, defrost heaters ON, drain pan heaters ON, defrost termination/fan delay thermostat, fan delay, compressor ON, fan ON.
Explanation: The standard electric defrost sequence involves shutting down the compressor and fans, energizing heaters, allowing for a drain time, then activating fans after the coil cools enough (fan delay) and the termination thermostat is satisfied, before restarting the compressor.
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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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