HVAC Excellence case studies
HVAC Excellence · Put your knowledge to work in context.
HVAC Excellence is the HVACR education and workforce standards program operated by ESCO Group, headquartered in Mt. It develops standards and resources that support the quality of education, training, credentialing, and workforce development across the HVACR and building science industries - including programmatic accreditation, a competency and task list framework used by educators, continuing education training recognition, and the National HVACR Education Conference. The HVAC Excellence case studies are 5 cases and about 2,473 words.
1Walk-In Cooler Running High Superheat and Low Subcooling
An 8 ft × 10 ft × 8 ft walk-in cooler holding produce runs on R-404A through a TXV and an air-cooled condensing unit. Outdoor ambient at the unit is 95°F.
539 words, about 3 min2Heat Pump Contactor Chattering When Auxiliary Heat Stages
A 3-ton heat pump with a 10 kW electric auxiliary heat package serves a 1,800 ft² house. The homeowner reports the outdoor unit 'short-cycling' and a loud clicking from the air handler whenever the auxiliary heat is energized.
527 words, about 3 min3Gas Furnace Overfired at Nameplate Manifold Pressure
A residential natural gas furnace is rated 90,000 Btu/hr input with an 80% AFUE and a nameplate temperature rise of 35–65°F. The technician clocks the meter's 1 ft³ dial: two revolutions in 72 seconds.
506 words, about 3 min4Three-Ton System With 0.92 in. w.c. External Static
A 3-ton R-410A split system in a single-story house has a measured total external static pressure of 0.92 in. with a new 20×25×1 filter.
426 words, about 2 min5Blower-Door and Duct-Leakage Results on a 2,000 ft² House
A 2,000 ft² single-story house with 8 ft ceilings gets a blower-door test: 2,400 CFM50. For duct testing, the air handler is off and all registers are taped; a duct blaster reports 180 CFM25 total leakage.
475 words, about 2 min