NATE Heat Pump Service case studies
NATE Heat Pump Service · Put your knowledge to work in context.
NATE Heat Pump Service is one of the specialty certification exams offered within the NATE (North American Technician Excellence) HVACR certification program. NATE describes itself as the nation's largest nonprofit certification organization for heating, ventilation, air conditioning and refrigeration technicians, and its exams are intended to validate the knowledge and field competence of working and prospective HVACR technicians rather than to license them. The NATE Heat Pump Service case studies are 5 cases and about 2,690 words.
1No Heat After an Outage: Stuck Reversing Valve or Failed Compressor?
A 3-ton R-410A split heat pump, installed in 2019, serves a single-family house. After a six-hour utility outage, the homeowner reports that the outdoor unit runs but the house gets no heat.
592 words, about 3 min2Commissioning a New 3-Ton Heat Pump in 45°F Weather
A contractor installs a new 3-ton R-410A split heat pump with a matched indoor coil, a 15 kW electric strip heater, and a 50-ft line set. The outdoor unit is on a pad at ground level; the indoor coil is in an upflow air handler in a closet.
548 words, about 3 min3Defrost That Will Not Terminate
A 2.5-ton R-410A heat pump is icing the outdoor coil and then staying in defrost too long. Outdoor ambient is 34°F and the indoor thermostat is set to 70°F.
567 words, about 3 min4High Head Pressure on a 92°F Day: Overcharge or Condenser Airflow?
A 3-ton R-410A heat pump is running in cooling mode on a 92°F afternoon. Indoor dry bulb is 75°F and indoor wet bulb is 63°F.
503 words, about 3 min5Fixed-Orifice Charge Check With Low Airflow
A 2.5-ton R-410A heat pump with a fixed orifice at the indoor coil is not keeping up on a 95°F day. Indoor dry bulb is 75°F and wet bulb is 67°F; outdoor ambient is 95°F.
480 words, about 2 min