Residential and Light Commercial HVAC Installation Practice Test
Build your confidence for Residential and Light Commercial HVAC Installation. Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
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Review residential and light commercial HVAC installation, including air conditioning, heat pumps, gas heating, airflow, electrical connections, and commissioning. The questions help people building or checking installation knowledge connect equipment selection and setup with system performance and safety.
Sample Questions
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An installer adds a UV light inside an air handler near a plastic drain pan and wiring harness. The UV kit is aftermarket but marketed for HVAC coils. What should be verified?
A new R-410A split system with a TXV has a 15 ft factory charge allowance, but the installed liquid line is 55 ft. The data plate gives an added charge per extra foot of 3/8 in. liquid line. Outdoor ambient is too low for final cooling-mode verification. How should the initial charge be established?
A furnace is installed in a sealed mechanical closet with a louvered transfer grille to the hallway. After doors are closed, return static improves but the closet becomes strongly negative when the blower starts. What must be evaluated?
A new cooling system has a clean filter and correct blower tap. Dry-bulb temperature split across the coil is only 12 F, superheat is high, and subcooling is low. What should the installer suspect first?
A supply trunk is hung from threaded rod in a basement. The trunk slopes downward away from the furnace, and condensate forms on the outside during cooling near an unsealed exterior wall penetration. What installation issue should be addressed first?
Exam insights and study advice
HVAC installation requires attention to interacting equipment, airflow, refrigerant circuits, electrical systems, and startup measurements.