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NATE: Heat Pumps 2024/2025 already graded A+ $13.49
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NATE: Heat Pumps 2024/2025 already graded A+

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NATE: Heat Pumps 2024/2025 already graded A+

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  • March 5, 2024
  • 3
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
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Ashley96
NATE: Heat Pumps

What is the purpose of the reversing valve on an air-to-air heat pump: - ANSIt 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: - ANSthe compressor
discharge line

On a reversing-valve solenoid, what is connected to the bottom center tube: - ANSthe
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: - ANS75 psig

Where are the check valves located on an air-to-air heat pump: - ANSon the outdoor coil and
indoor coil

How are the check valves connected in a heat pump system: - ANSin parallel with both
metering devices+in series with one metering device and parallel with the other

A ball-type check valve must be installed: - ANSvertically, with the seat on the bottom of the
valve

When installing a ball-type check valve, what must be done to prevent warping: - ANSA heat
sink must be used when brazing it into the line

Where is the accumulator located on a heat pump system: - ANSbetween 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: - ANSduring the
heating mode after a defrost

What component must always be de-energized during the defrost cycle on a heat pump: -
ANSthe outdoor fan

Why are the auxiliary strip heaters energized during the defrost cycle: - ANSto increase
supply-air temperature for comfort

What position must the reversing valve be in during the defrost cycle: - ANSthe cooling mode

When a heat pump switches into the defrost cycle, it must: - ANSremain in defrost until the
outdoor coil has reached a predetermined temperature

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