BPI HVAC Systems 2

Question 1

What does the ACCA Manual J calculation determine for a residential building?

Accepted Answer

Heating and cooling load

Answer

Manual J is the industry-standard protocol for calculating a home's heating and cooling loads, which determines the required equipment capacity.

Question 2

Which condition indicates that a heat pump is operating in defrost mode?

Accepted Answer

Outdoor fan stops and reversing valve cycles

Answer

During defrost, the outdoor fan stops and the reversing valve shifts to move hot refrigerant to the outdoor coil to melt accumulated frost.

Question 3

In a forced-air system, what is the primary purpose of a return air plenum?

Accepted Answer

Collect and route return air to the air handler

Answer

The return air plenum collects air from return ducts throughout the home and channels it back to the air handler for reconditioning.

Question 4

A homeowner reports that their central air conditioner runs continuously but never reaches the set temperature on very hot days. What is the MOST likely cause?

Accepted Answer

Undersized equipment for the cooling load

Answer

An air conditioner that runs continuously without satisfying the thermostat on design-temperature days is typically undersized for the building's actual cooling load.

Question 5

What does a high static pressure reading across the air filter indicate in an HVAC system?

Accepted Answer

Filter is loaded and restricting airflow

Answer

Elevated pressure drop across a filter indicates it has collected enough particulate to significantly restrict airflow through the system.

(BPI) Building Performance Institute Certified Practice Test

(BPI) Building Performance Institute Certified Practice Test

BPI HVAC Systems 2