Refrigeration Technician Interview Questions and Answers

There are several types of refrigeration compressors used in various applications.

• Reciprocating compressors: commonly used in household refrigerators and small commercial units.

• Scroll compressors: used in air conditioning systems and heat pumps.

• Rotary compressors: used in larger commercial and industrial refrigeration systems.

• Centrifugal compressors: used in large-scale industrial applications like gas liquefaction and air separation.

• Screw compressors: used in industrial refr...read more

There are several types of expansion valves used in refrigeration systems.

• The most common types of expansion valves are thermostatic expansion valves (TXV), electronic expansion valves (EEV), and capillary tubes.

• Thermostatic expansion valves regulate the flow of refrigerant based on temperature and pressure.

• Electronic expansion valves use electronic controls to precisely regulate the flow of refrigerant.

• Capillary tubes are simple, fixed-length tubes that provide a restriction...read more

Gas charging is done to ensure proper functioning and efficiency of refrigeration systems.

• Gas charging is the process of adding refrigerant gas to a refrigeration system.

• It is necessary to maintain the correct amount of refrigerant in the system for optimal performance.

• Gas charging helps in achieving the desired cooling effect and temperature control.

• It also helps in preventing compressor damage due to low refrigerant levels.

• Gas charging may be required during installation, m...read more

To check proper voltage, use a multimeter to measure voltage at the source and at the appliance.

• Use a multimeter to measure voltage at the source and at the appliance

• Check the voltage rating of the appliance to ensure it matches the source

• Ensure the voltage is within the acceptable range for the appliance

• Check for loose or damaged wiring that could affect voltage

The locations at the back side need to be checked.

• Check for any leaks or damage to the refrigerant lines

• Inspect the condenser coils for any dirt or debris buildup

• Ensure that the fan motor is functioning properly

• Check the compressor for any signs of wear or damage

• Inspect the evaporator coils for any frost buildup or blockages