AZ HVAC case studies
AZ HVAC · Put your knowledge to work in context.
The Arizona C-39 Air Conditioning and Refrigeration license is a contractor license issued by the Arizona Registrar of Contractors (ROC). It authorizes a business - not an individual technician - to contract for the installation, alteration, repair, and servicing of heating, ventilating, air conditioning, and refrigeration systems in Arizona. Candidates are typically experienced installers, service technicians, and foremen who are ready to run their own company or to serve as the qualifying party for one. The trade exam covers the technical side of the work: the refrigeration cycle and its components, heating and cooling equipment, electrical motors and controls, duct design and air distribution, piping and brazing, load calculation, jobsite safety, and estimating. The AZ HVAC case studies are 5 cases and about 3,768 words.
1Changeout on a Tucson House with Ducts That Can't Take the Airflow
You are quoting a changeout on a 1,850 ft² 1979 block-and-stucco house in Tucson (design 104°F DB / 71°F WB). The existing 5-ton R-22 single-stage condenser has had two compressor replacements in nine years.
694 words, about 3 min2High Amps and a Tripping Breaker on a 208/230 V Split
Service call on a 3-ton R-410A split, 208/230 V single phase. Nameplate: RLA 16.7 A, LRA 96 A, MCA 21.5 A, MOP 35 A.
735 words, about 4 min3Second Floor Never Cools: Static Pressure Tells the Story
Two-story, 2,400 ft² house, 4-ton variable-speed air handler in a second-floor closet, a single 20×25 return grille in the first-floor hallway, and all-flex ductwork in the attic. Complaint: upstairs bedrooms run 5–7°F warmer than downstairs and the system runs continuously.
714 words, about 4 min4Brazing an Attic Coil Next to a Gas Water Heater in July
Mid-July, 2 p.m., Phoenix. You must replace a leaking evaporator coil in a horizontal attic unit.
847 words, about 4 min5The Customer Who Wants No Permit, No Contract, and Cash
You are the qualifying party for an Arizona air conditioning contracting business. A homeowner wants two 3-ton changeouts at 18,400 total.
778 words, about 4 min