Air Conditioning Repair Heat Load Calculations and System Sizing

Question 1

What unit is commonly used to measure the cooling capacity of an air conditioning system?

Accepted Answer

BTU/hr

Answer

Watts

Answer

Horsepower

Answer

Kilowatts

Question 2

How many BTU/hr are equivalent to one ton of refrigeration?

Accepted Answer

12,000

Answer

6,000

Answer

9,000

Answer

18,000

Question 3

What is ACCA Manual J used for in the HVAC industry?

Accepted Answer

Performing residential load calculations

Answer

Selecting refrigerant recovery equipment

Answer

Sizing commercial duct systems

Answer

Calculating EPA refrigerant allowances

Question 4

Which of the following factors does NOT significantly affect a building's cooling load?

Accepted Answer

Interior wall paint color

Answer

Window area and orientation

Answer

Attic insulation levels

Answer

Number of occupants

Question 5

What is the primary consequence of installing an oversized air conditioning system?

Accepted Answer

Short cycling and poor humidity control

Answer

Lower monthly energy bills

Answer

Improved dehumidification performance

Answer

Extended equipment service life

Question 6

What does the Sensible Heat Ratio (SHR) indicate about an air conditioning system?

Accepted Answer

The proportion of total cooling capacity devoted to sensible versus latent heat removal

Answer

The ratio of refrigerant charge to system capacity

Answer

The efficiency rating of the compressor

Answer

The ratio of supply air to return air volume

Question 7

What is the recommended method for sizing a replacement air conditioner when no prior load data is available?

Accepted Answer

Perform a proper Manual J load calculation

Answer

Match the existing system's capacity exactly

Answer

Install one size larger for added comfort margin

Answer

Apply the rule of 500 square feet per ton