HVAC Excellence Gas Heat Certification case studies
HVAC Excellence Gas Heat · Put your knowledge to work in context.
The HVAC Excellence Gas Heat Certification - often searched as HEAT - is one of the portable, stackable certifications offered within the HVAC Excellence family of credentials from ESCO Group. HVAC Excellence describes its mission as developing standards and resources that strengthen the quality of education, training, credentialing, and workforce development across the HVACR and building science industries, and it positions its certifications so that students, technicians, contractors, and instructors can pursue progressive levels of certification at every stage of their careers. The HVAC Excellence Gas Heat case studies are 5 cases and about 3,452 words.
1Propane Conversion With the Wrong Burner Orifices
A technician answers a no-heat call at a rural house that was switched from natural gas to a 500-gallon propane tank about two months ago. The furnace is a 20-year-old, 80% AFUE induced-draft unit rated 90,000 BTU/h input, with a nameplate manifold pressure of 3.5 in.
705 words, about 4 min2High-Limit Cycling in a Closet With a Quiet Blower Tap
An 80,000 BTU/h, 80% AFUE upflow furnace in a closet with a louvered door runs four to five minutes, then the main burner shuts off while the blower keeps running. About three minutes later the burner relights and the cycle repeats.
701 words, about 4 min3Orphaned Water Heater in an Oversized Masonry Chimney
A contractor replaced an old 100,000 BTU/h natural-draft furnace with a 96% AFUE condensing furnace that now vents through 2-inch PVC out the sidewall. The existing 40-gallon, 40,000 BTU/h atmospheric water heater still connects to the original 8 by 12-inch clay-tile masonry chimney, which runs 25 feet up an exterior wall and has no liner.
675 words, about 3 min4Intermittent Flame-Proving Lockout on a Two-Wire Circuit
A 90% AFUE two-stage furnace with a hot surface igniter and a remote flame sensor has locked out three nights in a row. The technician watches the sequence: the inducer runs, the pressure switch proves, the igniter glows orange for 17 seconds, the gas valve opens, the flame lights and looks strong and blue across all burners, and then, three to six seconds later, the gas valve drops out before the blower ever starts.
680 words, about 3 min5Low-Level CO Alarms in a Home With a Shared Chimney
A family of four calls because their listed low-level CO alarm has sounded twice in one week, both times in the early morning. No one reports headaches when the alarm is silent.
691 words, about 3 min