Heat Pump Test with Correct Answers

What is the main difference between a heat pump and a fossil fuel furnace? - Heat pumps move heat instead of creating it How can you lower the temperature at which evaporation takes place? - Reduce the pressure on the low side of the system During the cooling season, the heat pump operates as an? - Air Conditioner. How can an air source heat pump heat when the outdoor temperature is cold? - All molecules contain some heat until they reach absolute 0(-460F.) How does liquid turn back into vapor during the heating cycle? - Heat is taken from the outside air The big operational difference for Heat Pumps is? - In the heating cycle. Which of the following is the correct order of the flow in the heating cycle of an air source heat pump? - Compressor, reversing valve, indoor coil, outdoor TEV, outdoor coil, reversing coil Why are the coils in and air source heats pump referred to as the outdoor coil and indoor coil instead of the condenser and evaporator? - Their function (evaporator or condenser) reverses when the unit changes from cooling to heating The outdoor condenser in* - Both the cooling and defrost cycles The indoor coil is the condenser in* - The heating cycle Which of the following is responsible for shifting the position of the sliding cycle fee in the reversing valve? - Pressure Most heat pumps have two metering devices because* - Each coil must function as the evaporator during one of the cycles Why is a two-stage thermostat needed for the heating process? - It allows for extra heat to stabilize temperature For practical purposes, there is usually enough heat in the outdoor air to? - Provide all heating needs when the outdoor air temperature is 40°F or higher. Below 40 Deg. F, the heat pump? - May need supplementary heat to help it out.