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NATE: Heat Pumps Exam/41 Questions with Solutions
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NATE: Heat Pumps Exam/41Questions with Solutions
What is the purpose of the reversing valve on an air-to-air heat pump: - -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: - -the
compressor discharge line
-On a reversing-valve solenoid, what is connected to the bottom center
tube: - -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: - -75
psig
-Where are the check valves located on an air-to-air heat pump: - -on the
outdoor coil and indoor coil
-How are the check valves connected in a heat pump system: - -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: - -vertically, with the seat on the
bottom of the valve
-When installing a ball-type check valve, what must be done to prevent
warping: - -A heat sink must be used when brazing it into the line
-Where is the accumulator located on a heat pump system: - -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: - -
during the heating mode after a defrost
-What component must always be de-energized during the defrost cycle on
a heat pump: - -the outdoor fan
-Why are the auxiliary strip heaters energized during the defrost cycle: - -to
increase supply-air temperature for comfort
-What position must the reversing valve be in during the defrost cycle: - -
the cooling mode
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