WALMART MAINTENANCE HVAC and Refrigeration

Question 1

What does HVAC stand for?

Accepted Answer

Heating, Ventilation, and Air Conditioning

Answer

HVAC stands for Heating, Ventilation, and Air Conditioning, encompassing the systems that control indoor temperature, humidity, and air quality.

Question 2

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

Accepted Answer

R-404A or R-407A

Answer

R-404A and R-407A are the most common HFC refrigerants in commercial use, as R-22 was phased out due to ozone depletion concerns under the Montreal Protocol.

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

High-traffic retail environments generate more dust and contaminants, requiring filter changes every 1-3 months to maintain air quality and system efficiency.

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

The condenser coil releases the heat that the refrigerant absorbed from inside the refrigerated case to the outside environment, completing the heat transfer cycle.

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

Low refrigerant from a leak causes the system to run continuously without reaching target temperature, and uneven frost patterns occur due to insufficient refrigerant distribution.

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE HVAC and Refrigeration