NATE GS Installation case studies
NATE GS Installation · Put your knowledge to work in context.
NATE (North American Technician Excellence) is described on its own site as the nation's largest nonprofit certification organization for heating, ventilation, air conditioning and refrigeration (HVACR) technicians. The Installation (GS) credential is one of the NATE exams listed under the Exams Offered section of natex.org, aimed at technicians who install residential and light commercial HVAC systems rather than only service them. The NATE GS Installation case studies are 5 cases and about 3,526 words.
1High External Static Pressure in a Retrofit Duct System
A 2,400 ft² single-story house is getting a 3-ton heat pump replacement. The existing duct system is flexible insulated duct in an unconditioned attic, with a 20 in x 25 in filter grille and a 1-inch MERV 13 filter.
739 words, about 4 min2Condenser Fan Motor Cycling on Internal Overload
A 3-ton split system uses a permanent split capacitor condenser fan motor rated 1/4 hp, 208/230 V, and 1.4 A. After 12 minutes the fan stops; the motor housing is hot to the touch, and the fan restarts only after cooling for 20 minutes.
664 words, about 3 min3TXV System Charged by Suction Pressure
A newly installed 4-ton R-410A split air conditioner with a TXV is not cooling adequately. Indoor conditions are 75°F dry bulb and 63°F wet bulb; outdoor air is 95°F.
692 words, about 3 min4Reusing an R-22 Line Set for an R-410A Roof-Mounted Heat Pump
A 3-ton R-410A heat pump is being installed on a roof 22 ft above the indoor coil. The existing line set from an R-22 system is 75 ft of 3/8 in.
683 words, about 3 min5Furnace and Water Heater in a Confined Closet
A 100,000 BTU/h, 80% AFUE Category I gas furnace is replacing an old unit in a closet measuring 40 in. The closet has a solid, weather-stripped door and no combustion-air openings.
748 words, about 4 min