MS HVAC case studies
MS HVAC · Put your knowledge to work in context.
HVAC Excellence describes its credentials as portable and stackable certifications that students, technicians, contractors, and instructors can pursue as progressive levels at every stage of their careers, and states that it offers exams at each of those levels. Professional Level certifications sit within that ladder, above entry-level employment-ready testing and below the Master Specialist tier, which the organization lists as its own certification category. The MS HVAC case studies are 5 cases and about 3,124 words.
1High Superheat and Low Subcooling on a 3-Ton R-410A Split System
A technician responds to a no-cooling call at a 2,400 ft² single-story house. The system is a 3-ton R-410A split system with a thermostatic expansion valve, a matched air handler, and a PSC blower.
636 words, about 3 min2Walk-In Cooler Floodback After an R-448A Retrofit
A supermarket walk-in cooler measuring 10 ft by 8 ft by 8 ft is maintained at 38°F. The system was retrofitted from R-404A to R-448A six weeks ago.
631 words, about 3 min324 V Contactor Dropout on a Rooftop Unit With Economizer
A 7.5-ton rooftop unit serves a small office. The unit has two compressors, an economizer with a 24 V modulating actuator, a 40 VA control transformer, and a 24 V thermostat.
620 words, about 3 min4Conference Room CO2 and Minimum Outdoor Air
A 600 ft² conference room with a 9 ft ceiling is served by a VAV terminal with a design airflow of 900 cfm and a minimum airflow of 270 cfm. The room is designed for 20 occupants.
612 words, about 3 min5Low Hot-Water Output on a 500 MBH Commercial Boiler
A 500 MBH input commercial hot-water boiler serves a baseboard loop. The boiler is rated at 80% thermal efficiency at 40 gpm and a 20°F temperature rise.
625 words, about 3 min