Refrigeration and Air Conditioning Mechanic Interview Questions and Answers

This interview question is about VAV, HVAC, AHU, refrigeration cycle, and types of chillers.

• VAV stands for Variable Air Volume, HVAC stands for Heating, Ventilation, and Air Conditioning, and AHU stands for Air Handling Unit.

• The refrigeration cycle is a process that removes heat from a low-temperature area and transfers it to a high-temperature area.

• Types of chillers include air-cooled chillers, water-cooled chillers, and absorption chillers.

Replace the condensing fan motor with a new one to fix the issue.

• Disconnect power to the unit before starting any work.

• Remove the old condensing fan motor by unscrewing it from the unit.

• Install the new condensing fan motor by securely screwing it in place.

• Reconnect power and test the unit to ensure the fan motor is working properly.

There are several types of compressors used in refrigeration and air conditioning systems.

• Reciprocating compressors use pistons to compress refrigerant gas.

• Rotary compressors use rotating blades or vanes to compress refrigerant gas.

• Scroll compressors use two spiral-shaped scrolls to compress refrigerant gas.

• Centrifugal compressors use a high-speed impeller to compress refrigerant gas.

• Screw compressors use two interlocking screws to compress refrigerant gas.

• Each type of compre...read more