FREE Air Conditioning Repair Evaporator Coil Maintenance Questions and Answers

Question 1

Which of the following is the most common consequence of a severely dirty evaporator coil on an HVAC system?

Accepted Answer

Decreased airflow, reduced heat transfer, and potential coil icing.

Answer

Increased system capacity and lower energy consumption.

Answer

Higher suction pressure and lower discharge pressure.

Answer

Accelerated wear on the condenser fan motor.

Question 2

A homeowner reports that their air conditioner is running constantly but not cooling effectively, and they've noticed water dripping from the indoor unit. Upon inspection, a technician finds the evaporator coil is completely encased in a thick layer of ice. What is the MOST immediate action the technician should advise or take?

Accepted Answer

Turn off the system and allow the coil to defrost completely before further diagnosis.

Answer

Immediately add refrigerant to increase the system pressure.

Answer

Increase the fan speed to melt the ice faster.

Answer

Bypass the low-pressure switch to force the compressor to run.

Question 3

When cleaning an evaporator coil, what type of cleaning agent is generally recommended for optimal results and safety?

Accepted Answer

Non-foaming, alkaline-based coil cleaner designed for evaporator coils.

Answer

High-pressure abrasive blasting.

Answer

Heavy-duty acid-based descaler.

Answer

Household bleach solution.

Question 4

During routine maintenance, a technician notices that the condensate drain line for an evaporator coil is partially clogged. What is the primary risk associated with this condition?

Accepted Answer

Water overflow causing damage to the indoor environment.

Answer

Reduced refrigerant charge.

Answer

Increased outdoor ambient temperature.

Answer

Premature failure of the compressor's start capacitor.

Question 5

Which of the following indicates a successful and thorough cleaning of an evaporator coil?

Accepted Answer

The coil fins appear shiny and new, and airflow across the coil has visibly improved.

Answer

The system's high-side pressure has significantly increased.

Answer

The indoor fan motor is running at a slower speed.

Answer

The outdoor unit is consuming more power than before.

Question 6

What is the recommended frequency for professional cleaning of an evaporator coil in a typical residential setting?

Accepted Answer

Annually, as part of a comprehensive HVAC maintenance plan.

Answer

Every 5-7 years.

Answer

Only when a noticeable performance issue arises.

Answer

Monthly during the cooling season.