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NATE air to air heat pump 4 heat pumps Exam Questions and Answers
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NATE air to air heat pump 4 heat pumps Exam Questions and Answers
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NATE air to air heat pump 4 heat pumps Exam Questions and Answers.The primary function of a reversing valve is to... 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? Answer - The discharge line
Of the three ports on one side of the reversing valve's body, to what is the center port connected? Answer - The accumulator
If a heat pump system is low on charge, then the reversing valve... Answer - Is less likely to slide
If a reversing valve is leaking under the side, then... Answer - The pressures will equalize
Most defrost requirements occur at what outdoor temperature? Answer - Between 35 and 45
The ambient temperature sensor for a heat pump's defrost system should be located... 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... 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... Answer - The pressure difference increases to initiation
Once defrost is initiated, what else usually happens? Answer - All of the above: outdoor fan is shut off, the reversing valve is switched to the cooling mode, emergency heat strips are energized
The balance point of a heat pump can best be described as... Answer - The point at which the building's heat loss equals the heat pump's ability to provide heat
The outdoor unit must be located so that... Answer - All of the above: roof run off is avoided, defrost water can drain away, is elevated above snow drifts.
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