NATE Heat Pumps 2

Question 1

Which type of heat pump extracts heat from the ground rather than outdoor air?

Accepted Answer

Geothermal (ground-source) heat pump

Answer

Air-source heat pump

Answer

Mini-split heat pump

Answer

Absorption heat pump

Question 2

When a heat pump is in heating mode and the emergency heat is energized, what happens?

Accepted Answer

Only electric resistance strips provide heat; the compressor is locked out

Answer

Both the compressor and electric strips run simultaneously

Answer

The reversing valve switches to cooling mode

Answer

The outdoor fan runs at high speed

Question 3

What is a common symptom of a stuck reversing valve in the heating position?

Accepted Answer

Both A and C

Answer

System heats normally but will not cool

Answer

Compressor short cycles

Answer

Outdoor coil ices over in summer

Question 4

What is the purpose of the check valves used in a heat pump refrigerant circuit?

Accepted Answer

Redirect refrigerant flow so both the indoor and outdoor coils can act as either evaporator or condenser

Answer

Prevent compressor oil from leaving the crankcase

Answer

Limit high-side pressure during summer operation

Answer

Remove moisture from the refrigerant

Question 5

What outdoor temperature indicates a heat pump may need a 'cold climate' or variable-speed model to remain effective?

Accepted Answer

Below 0°F

Answer

Below 50°F

Answer

Below 32°F

Answer

Below 20°F

Question 6

What does HSPF2 measure for a heat pump?

Accepted Answer

Heating efficiency measured as total heat output divided by total electrical energy over the heating season

Answer

Cooling efficiency over a season

Answer

Defrost cycle frequency

Answer

Compressor efficiency ratio