Electrician and AC Technician Interview Questions and Answers

R22 and R410 are different types of refrigerants used in air conditioning systems.

• R22 is a hydrochlorofluorocarbon (HCFC) refrigerant commonly used in older air conditioning systems.

• R410 is a hydrofluorocarbon (HFC) refrigerant that is more environmentally friendly and commonly used in newer systems.

• R22 is being phased out due to its harmful effects on the ozone layer, while R410 is considered a more sustainable option.

• R410 operates at higher pressures than R22, so systems de...read more

Ice formation in suction line can be caused by various factors.

• Low refrigerant charge

• Dirty air filters

• Blocked or restricted airflow

• Faulty expansion valve

• Low ambient temperature

• Defective compressor

• Leaking suction line

• Incorrectly sized suction line

• Inadequate insulation

• Moisture in the system

To find AC capacitance, check the label on the AC unit or refer to the manufacturer's specifications.

• Check the label on the AC unit for the capacitance rating

• Refer to the manufacturer's specifications for the AC unit

• Use a multimeter to measure the capacitance if the rating is not available

Error codes can be found by checking the display panel of the equipment or referring to the user manual.

• Check the display panel of the equipment for any error codes

• Refer to the user manual for a list of error codes and their meanings

• Use diagnostic tools or software provided by the manufacturer to retrieve error codes

• Consult with technical support or a professional technician for assistance

AC gas is used in AC service to cool the air inside the system.

• AC gas is a refrigerant used in air conditioning systems to absorb and release heat.

• The gas circulates through the system, changing from a high-pressure gas to a low-pressure liquid to cool the air.

• Regular AC service includes checking and refilling the AC gas levels to ensure optimal cooling efficiency.

AC repair involves checking for leaks, fixing any issues, and recharging the system with the appropriate amount of refrigerant gas.

• Check for leaks in the AC system

• Fix any leaks or issues found

• Recharge the system with the correct amount of refrigerant gas

• Ensure proper pressure and temperature levels are maintained

• Test the AC system to ensure it is working efficiently