HVAC NATE Heat Pump Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A

HVAC NATE Heat Pump Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A Q: What is the absolute pressure at sea level if a gauge pressure is 35 psig? Answer: 49.7psia Q: 100,000 BTUH output furnace. Return air temp is 65F. Supply air is 135F. What is the CFM? Answer: 1323CFM Q: What is the best method of repair when a residential supply diffuser is noisy because of a loose vane? Answer: Replace the diffuser. Q: When performing preventive maintenance on a heat pump what should the technician check and why? Answer: Outdoor fan. To be certain it runs freely with no binding. Q: What is the effect of 170 volts supplied to a 208/230 volt compressor? Answer: Would cause the current to increase and the motor may trip on overload. Q: On a service call for a cooling problem with a heat pump, your inspections find a liquid line that has condensation on it. What is most likely to cause this? Answer: Restriction in the liquid line. Q: What is a reason for cool air complaints when a heat pump is operating in the heating cycle? Answer: Excessive supply air velocities. Q: The following measurements are recorded on an operating heat pump system. The heat pump is operating with the compressor only with no auxiliary heat: • Heat pump only supply air temperature 92°F • Heat pump only return air temperature 70°F • Outdoor temperature 54°F • Supply air temp. /auxiliary heat ON 115°F • Return air temp. /auxiliary heat ON 70°F • CFM 1228 What is the heating capacity in BTUH? Answer: 29,177 BTU/H Q: Inadequate heating can be caused by what? Answer: Dirty or clogged air filter. Q: To minimize noise problems in residential duct systems, what is the range (recommended to maximum) of design air velocity in the rectangular main supply trunk? Answer: 700 to 900 fpm Q: conditions while checking a packaged heat pump in cooling. • The unit has a piston type metering device on both the indoor and outdoor coils. • Outdoor temperature 75°F • Superheat 55°F What is wrong with the system? Answer: Undercharged. Q: What will you get when a capillary tube is overcharged? Answer: low superheat and high sub cooling Q: What is the effect of a low charge on the switchover operations of a reversing valve? Answer: Reversing valves are less likely to transfer if charge is low. Q: A technician is working on a heat pump with a capacitor start-capacitor run compressor. On initial startup, the compressor hums momentarily and the shuts down on internal overload. What is the problem? Answer: Too great a pressure difference on the compressor. Q: A step down transformer has a rating of 40 VA. Its primary voltage is 120V with a secondary voltage of 24V. What is the maximum current draw of a load connected to this transformer? Answer: 1.7amps Q: What does a bright red or orange glow from the resistance element in a duct heater indicate? Answer: Flow of air is insufficient. Q: What does the outdoor fan do during defrost on a heat pump and why? Answer: