HVAC NATE Heat Pump Exam (Latest 2024/
2025 Update) 100% Correct Questions and
Verified Answers| Grade A
What is the purpose of the reversing valve on an air-to-air heat pump: - ANSWER
It changes the flow of the refrigerant, making the indoor coil the condenser during the winter
months
On a reversing-valve solenoid, what is connected to the top tube: - ANSWER
the compressor discharge line
On a reversing-valve solenoid, what is connected to the bottom center tube: - ANSWER
the compressor suction line
What pressure difference must be between the low side and the high side of the heat pump
system for the reversing valve to operate properly: - ANSWER 75 psig
Where are the check valves located on an air-to-air heat pump: - ANSWER
on the outdoor coil and indoor coil
, How are the check valves connected in a heat pump system: - ANSWER in
parallel with both metering devices+in series with one metering device and parallel with the
other
A ball-type check valve must be installed: - ANSWER vertically, with the
seat on the bottom of the valve
When installing a ball-type check valve, what must be done to prevent warping: - ANSWER
A heat sink must be used when brazing it into the line
Where is the accumulator located on a heat pump system: - ANSWER
between the bottom center tube of the reversing valve and the compressor
When would you most likely find liquid in the vapor line on a heat pump: - ANSWER
during the heating mode after a defrost
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