NATE Heat Pumps Exam with precise detailed solutions ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is the purpose of the reversing valve on an air-to-air heat pump: - correct answer✔✔It
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changes the flow of the refrigerant, making the indoor coil the condenser during the winter
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months
On a reversing-valve solenoid, what is connected to the top tube: - correct answer✔✔the
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compressor discharge line ||\\//|| ||\\//||
On a reversing-valve solenoid, what is connected to the bottom center tube: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔the compressor suction line ||\\//|| ||\\//|| ||\\//||
What pressure difference must be between the low side and the high side of the heat pump
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system for the reversing valve to operate properly: - correct answer✔✔75 psig
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Where are the check valves located on an air-to-air heat pump: - correct answer✔✔on the
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outdoor coil and indoor coil ||\\//|| ||\\//|| ||\\//|| ||\\//||
How are the check valves connected in a heat pump system: - correct answer✔✔in parallel
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
with both metering devices+in series with one metering device and parallel with the other
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A ball-type check valve must be installed: - correct answer✔✔vertically, with the seat on the
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bottom of the valve ||\\//|| ||\\//|| ||\\//||
When installing a ball-type check valve, what must be done to prevent warping: - correct
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answer✔✔A heat sink must be used when brazing it into the line ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Where is the accumulator located on a heat pump system: - correct answer✔✔between the
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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: - correct
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answer✔✔during the heating mode after a defrost ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What component must always be de-energized during the defrost cycle on a heat pump: -
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correct answer✔✔the outdoor fan ||\\//|| ||\\//|| ||\\//||
Why are the auxiliary strip heaters energized during the defrost cycle: - correct answer✔✔to
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
increase supply-air temperature for comfort ||\\//|| ||\\//|| ||\\//|| ||\\//||
What position must the reversing valve be in during the defrost cycle: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔the cooling mode ||\\//|| ||\\//||
When a heat pump switches into the defrost cycle, it must: - correct answer✔✔remain in
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defrost until the outdoor coil has reached a predetermined temperature
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A defrost termination thermostat is commonly located: - correct answer✔✔on the outdoor
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coil, and opens at 55° F
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What type of system uses a temperature and a pressure sensor to control the defrost cycle: -
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correct answer✔✔a pressure-initiation-temperature-termination defrost system
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A pressure switch, used on the defrost cycle of a heat pump, commonly closes at a preset
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pressure difference of: - correct answer✔✔.5" to .65" WC ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Temperature split refers to: - correct answer✔✔the temperature difference between the air ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
entering a coil and the temperature of the coil ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is the purpose of the reversing valve on an air-to-air heat pump: - correct answer✔✔It
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
changes the flow of the refrigerant, making the indoor coil the condenser during the winter
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months
On a reversing-valve solenoid, what is connected to the top tube: - correct answer✔✔the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
compressor discharge line ||\\//|| ||\\//||
On a reversing-valve solenoid, what is connected to the bottom center tube: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔the compressor suction line ||\\//|| ||\\//|| ||\\//||
What pressure difference must be between the low side and the high side of the heat pump
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system for the reversing valve to operate properly: - correct answer✔✔75 psig
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Where are the check valves located on an air-to-air heat pump: - correct answer✔✔on the
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
outdoor coil and indoor coil ||\\//|| ||\\//|| ||\\//|| ||\\//||
How are the check valves connected in a heat pump system: - correct 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: - correct 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: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔A heat sink must be used when brazing it into the line ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Where is the accumulator located on a heat pump system: - correct 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: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔during the heating mode after a defrost ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What component must always be de-energized during the defrost cycle on a heat pump: -
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
correct answer✔✔the outdoor fan ||\\//|| ||\\//|| ||\\//||
Why are the auxiliary strip heaters energized during the defrost cycle: - correct answer✔✔to
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
increase supply-air temperature for comfort ||\\//|| ||\\//|| ||\\//|| ||\\//||
What position must the reversing valve be in during the defrost cycle: - correct
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
answer✔✔the cooling mode ||\\//|| ||\\//||
When a heat pump switches into the defrost cycle, it must: - correct answer✔✔remain in
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
defrost until the outdoor coil has reached a predetermined temperature
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A defrost termination thermostat is commonly located: - correct answer✔✔on the outdoor
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
coil, and opens at 55° F
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What type of system uses a temperature and a pressure sensor to control the defrost cycle: -
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
correct answer✔✔a pressure-initiation-temperature-termination defrost system
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
A pressure switch, used on the defrost cycle of a heat pump, commonly closes at a preset
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
pressure difference of: - correct answer✔✔.5" to .65" WC ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Temperature split refers to: - correct answer✔✔the temperature difference between the air ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
entering a coil and the temperature of the coil ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
