HVAC Heating Systems 2

Question 1

What is a heat pump's Heating Seasonal Performance Factor (HSPF) used to measure?

Accepted Answer

The seasonal heating efficiency of a heat pump

Answer

The efficiency of heat pump cooling in summer

Answer

The airflow capacity of a heat pump system

Answer

The refrigerant charge level in a heat pump

Question 2

What is auxiliary (emergency) heat in a heat pump system?

Accepted Answer

Electric resistance heating that supplements or replaces heat pump heating

Answer

A backup cooling mode for the heat pump

Answer

A gas boiler connected in series with the heat pump

Answer

The defrost cycle heating mode

Question 3

At what outdoor temperature does a standard heat pump typically lose efficiency and need supplemental heat?

Accepted Answer

Below about 35-40°F (2-4°C)

Answer

50°F (10°C)

Answer

32°F (0°C)

Answer

20°F (-7°C)

Question 4

What is the purpose of a defrost cycle in a heat pump?

Accepted Answer

To remove frost that accumulates on the outdoor coil during heating mode

Answer

To cool the indoor coil during summer

Answer

To defrost the expansion valve when iced over

Answer

To warm the refrigerant before compression in cold weather

Question 5

What type of heating system uses water as the heat transfer medium distributed through pipes to radiators or radiant floor tubing?

Accepted Answer

Hydronic heating system

Answer

Forced-air system

Answer

Steam heating system

Answer

Geothermal system

Question 6

What is the purpose of a zone valve in a hydronic heating system?

Accepted Answer

To control the flow of hot water to a specific heating zone

Answer

To control water pressure throughout the system

Answer

To prevent backflow from the boiler

Answer

To mix hot and cold water to achieve the correct supply temperature