313D Load Calculation and Blueprints 2

Question 1

Which ACCA manual is the industry standard for residential cooling and heating load calculations?

Accepted Answer

Manual J

Answer

ACCA Manual J is the nationally recognized standard for calculating residential heating and cooling loads.

Question 2

On a residential blueprint, what does the symbol 'CFM' stand for in ductwork notation?

Accepted Answer

Cubic Feet per Minute

Answer

CFM stands for Cubic Feet per Minute, which is the standard unit for measuring airflow volume in HVAC systems.

Question 3

When calculating cooling loads, which factor accounts for heat transmitted through walls, ceilings, and floors?

Accepted Answer

Conduction load

Answer

Conduction load accounts for heat transfer through the building envelope, including walls, ceilings, and floors.

Question 4

What does a dashed line typically represent on a mechanical floor plan?

Accepted Answer

Hidden or overhead ductwork

Answer

Dashed lines on mechanical plans typically indicate ducts or components located above or below the primary plane of view.

Question 5

In a Manual J calculation, what is the design temperature difference (DTD)?

Accepted Answer

Difference between outdoor design temp and indoor setpoint

Answer

The design temperature difference is the difference between the outdoor design dry-bulb temperature and the desired indoor setpoint temperature.

(313D) Residential Air Conditioning Systems Mechanic Certification Practice Test