NATE air to air heat pump 4 heat pumps
Exam with correct answers
The primary function of a reversing valve is to... - correct answer -Switch between
heating and cooling
A typical 4 way reversing valve has 3 ports on one side of the valve body, and a
single port on the opposite side of the valve body. To what is this single port
connected? - correct answer -The discharge line
Of the three ports on one side of the reversing valve's body, to what is the center
port connected? - correct answer -The accumulator
If a heat pump system is low on charge, then the reversing valve... - correct answer
-Is less likely to slide
If a reversing valve is leaking under the side, then... - correct answer -The pressures
will equalize
Most defrost requirements occur at what outdoor temperature? - correct answer -
Between 35 and 45
The ambient temperature sensor for a heat pump's defrost system should be
located... - correct answer -In the inlet air stream to the outdoor unit
If a heat pump's defrost system is initiated by temperature difference, then as the
outdoor coil ices up... - correct answer -The temperature difference increases to
initiation
If a heat pump's defrost system is initiated by pressure difference, then as the
outdoor coil ices up... - correct answer -The pressure difference increases to
initiation
Exam with correct answers
The primary function of a reversing valve is to... - correct answer -Switch between
heating and cooling
A typical 4 way reversing valve has 3 ports on one side of the valve body, and a
single port on the opposite side of the valve body. To what is this single port
connected? - correct answer -The discharge line
Of the three ports on one side of the reversing valve's body, to what is the center
port connected? - correct answer -The accumulator
If a heat pump system is low on charge, then the reversing valve... - correct answer
-Is less likely to slide
If a reversing valve is leaking under the side, then... - correct answer -The pressures
will equalize
Most defrost requirements occur at what outdoor temperature? - correct answer -
Between 35 and 45
The ambient temperature sensor for a heat pump's defrost system should be
located... - correct answer -In the inlet air stream to the outdoor unit
If a heat pump's defrost system is initiated by temperature difference, then as the
outdoor coil ices up... - correct answer -The temperature difference increases to
initiation
If a heat pump's defrost system is initiated by pressure difference, then as the
outdoor coil ices up... - correct answer -The pressure difference increases to
initiation
