HVAC Excellence Master AC case studies
HVAC Excellence Master AC · Put your knowledge to work in context.
HVAC Excellence Master Specialist Certifications are the top tier in a portable and stackable certification ladder offered by ESCO Institute's HVAC Excellence program, which develops standards and resources that strengthen education, training, credentialing and workforce development across HVACR and building science. The ladder starts with entry-level Employment Ready exams, continues through Specialty Certifications and Professional Level Certifications, and culminates in Master Specialist recognition. The HVAC Excellence Master AC case studies are 5 cases and about 4,281 words.
1High Superheat and High Subcooling on a Restaurant Split System
A 3-ton R-410A split system serves a restaurant dining room. Outdoor ambient is 95°F, return air at the unit is 76°F dry bulb and 62°F wet bulb, and the blower is moving a verified 1,200 CFM.
794 words, about 4 min2Compressor Trips on Overload with 'Normal' Voltage on All Three Phases
A 7.5-ton, 460-volt, three-phase rooftop unit cools a church fellowship hall. The compressor starts, runs about six minutes, then the internal overload opens and the unit locks out; it restarts after roughly 25 minutes and repeats the cycle.
840 words, about 4 min33-Ton Packaged Unit Delivering 935 CFM at 1.10 in. w.c. Static
A 3-ton packaged gas/electric unit with a fixed-speed PSC blower is rated 1,200 CFM at 0.50 in. external static pressure.
872 words, about 4 min4A2L Retrofit in a Basement Mechanical Room with Ignition Sources
A technician is replacing a failed R-410A condensing unit with a new R-454B (A2L) unit in a 1970s ranch house. The air handler and refrigerant lines sit in a 9 ft × 14 ft × 8 ft basement mechanical room that also contains a gas water heater with a standing pilot and a gas furnace with an electronic igniter.
890 words, about 4 min5Prioritizing an $8,000 Retrofit Budget on a Leaky 1978 House
A 2,200-square-foot single-story house built in 1978 in a hot-humid climate has a 3-ton, 10 SEER split system with an 80% AFUE gas furnace in a vented attic. A blower door test reads 3,200 CFM50 with 8-foot ceilings.
885 words, about 4 min