HVAC Excellence Gas Heat Certification Exam case studies
HVAC Excellence Gas Heat · Put your knowledge to work in context.
HVAC Excellence HEAT is the gas-heating certification exam in the HVAC Excellence family of portable and stackable certifications, administered by ESCO Group. According to the program's published materials, HVAC Excellence offers exams at progressive levels, so a technician can earn credentials at each stage of a career rather than starting over. The HVAC Excellence Gas Heat case studies are 5 cases and about 4,112 words.
1High-Altitude Furnace Running at Sea-Level Manifold Pressure
An 80% AFUE, single-stage induced-draft furnace with a 90,000 BTU/h input rating is installed at 5,400 ft elevation. The rating plate states the input applies from 0 to 2,000 ft and that above 2,000 ft the unit must be derated 4% per 1,000 ft, with a corresponding reduction in manifold pressure below the 3.5 in.
758 words, about 4 min2Adding a Tankless Water Heater to an Undersized 1/2 in. Gas Line
A single-family house has a natural gas meter with a 7 in. The existing furnace is rated 80,000 BTU/h and is fed by 35 ft of 1/2 in.
799 words, about 4 min3LP Conversion With the Regulator Changed but the Orifices Left Alone
A technician converts a 76,000 BTU/h natural gas furnace to LP. The manufacturer's kit contains four LP orifices, an LP regulator spring, and a conversion label.
863 words, about 4 min4Intermittent Mid-Cycle Lockout on a Condensing Furnace
A 90% AFUE two-stage condensing furnace with a hot surface igniter and a remote flame sensor locks out intermittently. Each call for heat begins normally: the inducer runs, the pressure switch closes, the igniter glows, the gas valve opens, and the burners light with a steady blue flame.
872 words, about 4 min5High Temperature Rise, Tripping Limit, and CO in the Supply Air
An upflow furnace rated 100,000 BTU/h input and 80,000 BTU/h output is rated for a 35–65°F temperature rise and 1,600 CFM at 0.5 in. The technician measures return air at 68°F, supply air at 145°F, and total external static pressure of 0.95 in.
820 words, about 4 min