Certified Energy Auditor Certification Certified Energy Auditor HVAC Systems and Performance Questions and Answers 2

Question 1

What is the primary purpose of measuring static pressure in an HVAC duct system during an energy audit?

Accepted Answer

To determine airflow resistance and identify duct restrictions

Answer

To calculate the refrigerant charge level

Answer

To measure indoor humidity levels

Answer

To assess the electrical load of the blower motor

Question 2

Which metric best indicates the seasonal cooling efficiency of a central air conditioning system?

Accepted Answer

SEER

Answer

AFUE

Answer

COP at peak load

Answer

Supply air temperature

Question 3

During a combustion efficiency test on a gas furnace, a high concentration of carbon monoxide in the flue gas most likely indicates what condition?

Accepted Answer

Incomplete combustion due to insufficient air or burner problems

Answer

Excess combustion air

Answer

A cracked heat exchanger allowing conditioned air into the flue

Answer

Over-fired gas valve with too much fuel pressure

Question 4

What is the recommended minimum outdoor air ventilation standard that energy auditors reference for commercial HVAC systems in the United States?

Accepted Answer

ASHRAE Standard 62.1

Answer

ASHRAE Standard 90.1

Answer

EPA Indoor airPLUS

Answer

ICC International Mechanical Code Chapter 1

Question 5

An energy auditor finds that a rooftop unit's economizer dampers remain fully closed during mild outdoor conditions when free cooling should be available. What is the most likely cause?

Accepted Answer

The outdoor air temperature sensor or economizer controller has failed

Answer

The compressor is short-cycling on high pressure

Answer

The condensate drain is clogged

Answer

The supply fan VFD is operating at minimum speed

Question 6

What does a low superheat reading at the evaporator coil of a direct-expansion cooling system typically indicate?

Accepted Answer

The system is overcharged or the expansion valve is feeding too much refrigerant

Answer

The condenser coil is dirty and needs cleaning

Answer

The compressor is losing capacity due to worn valves

Answer

The air filter is excessively dirty reducing airflow