Refrigeration & Air Conditioning Mechanic Red Seal · Question
A walk-in freezer requires a defrost cycle. Which of the following methods is typically controlled by a time clock initiating the defrost, and a temperature termination with a time-based safety backup for an electrical defrost system?
Electric defrost systems are commonly controlled by a defrost time clock to initiate at set intervals, a defrost termination thermostat (DTT) to end the cycle o
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Question: A walk-in freezer requires a defrost cycle. Which of the following methods is typically controlled by a time clock initiating the defrost, and a temperature termination with a time-based safety backup for an electrical defrost system?
Answer options: ✅ Electric defrost.
- Hot gas defrost.
- Off-cycle defrost.
- Water defrost.
Correct answer: Electric defrost.
Explanation: Electric defrost systems are commonly controlled by a defrost time clock to initiate at set intervals, a defrost termination thermostat (DTT) to end the cycle once the coil reaches a certain temperature (e.g., 10°C), and a defrost limit timer to prevent excessive heat and protect evaporator fans.
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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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