WALMART MAINTENANCE HVAC and Refrigeration

Question 1

What does HVAC stand for?

Accepted Answer

Heating, Ventilation, and Air Conditioning

Answer

High Voltage Alternating Current

Answer

Horizontal Vertical Air Circulation

Answer

Heavy Vehicle Access Control

Question 2

What is the most common refrigerant currently used in commercial refrigeration systems?

Accepted Answer

R-404A or R-407A

Answer

R-22 (Freon)

Answer

Ammonia

Answer

Carbon dioxide

Question 3

How often should HVAC filters typically be changed in a high-traffic retail environment?

Accepted Answer

Every 1-3 months depending on conditions

Answer

Once a year

Answer

Every 5 years

Answer

Only when the system breaks down

Question 4

What is the purpose of a condenser coil in a refrigeration system?

Accepted Answer

To release heat absorbed from the refrigerated space to the outside environment

Answer

To cool the store interior

Answer

To filter the refrigerant

Answer

To compress the refrigerant

Question 5

What symptom indicates a refrigerant leak in a commercial cooler?

Accepted Answer

The unit runs constantly but temperatures stay above setpoint, and frost may form unevenly

Answer

The unit runs quieter than usual

Answer

The lights inside flicker

Answer

The door gaskets change color

Question 6

What is the EPA Section 608 certification required for?

Accepted Answer

Purchasing and handling refrigerants in stationary systems

Answer

Operating a forklift

Answer

Installing electrical panels

Answer

Selling HVAC equipment