Refrigeration & Air Conditioning Mechanic Red Seal · Question
A large supermarket refrigeration system with an R-404A charge of 250 kg requires a top-up after a confirmed leak repair. After evacuation of the repaired section, the technician needs to add 20 kg of R-404A. What is the most accurate method for adding this specific amount of refrigerant?
For systems with a large charge and for precise top-ups, weighing in the refrigerant with an electronic charging scale is the most accurate method. This prevent
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Question: A large supermarket refrigeration system with an R-404A charge of 250 kg requires a top-up after a confirmed leak repair. After evacuation of the repaired section, the technician needs to add 20 kg of R-404A. What is the most accurate method for adding this specific amount of refrigerant?
Answer options: ✅ Weighing in the exact amount using an electronic charging scale.
- Charging by sight glass until the bubbles disappear.
- Charging by suction pressure and superheat until operating parameters are met.
- Charging until the system's liquid line receiver is full.
Correct answer: Weighing in the exact amount using an electronic charging scale.
Explanation: For systems with a large charge and for precise top-ups, weighing in the refrigerant with an electronic charging scale is the most accurate method. This prevents under or overcharging which can lead to inefficient operation or potential system damage, aligning with CSA B52 best practices.
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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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