NATE Practice Questions with Correct Answers

Heat Anticipators Are wired in series Cooling anticipators Are wired parallel Low pressure switches detects a loss of refrigerant Low pressure switches de energizes the compressor Electronic air cleaners do not remove odors Electronic air cleaners normally are 4000 to 8000 dc volts Air handlers above a ceiling have to have a secondary pan Latent heat changes the state of a substance but not the temp Always size a heat pump By the cooling capacity Sensible heat You can always read on a thermometer Demand Defrost is... looking for the coil temp and the ambient temp to increase to initiate a defrost Package units... the pad must be isolated from the structure to reduce vibration and noise Balance point is where the heat loss and heat gain are the same if water is not drained away from the outdoor unit ice will form on the coil and reduce capacity Radiation Method of heat transfer that does not include fluids or solids Voltage Electrical pressure Current flow Must have a power source, path, and a load Ohms Law E=I/R