HVAC Systems Analysis Flashcards
7 cards from real INTERNACHI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 HVAC Systems Analysis flashcards as text
What is the typical minimum clearance required between a gas furnace and combustible materials?
Answer: Per manufacturer specifications
Clearance requirements vary by furnace model and must follow the manufacturer's installation instructions, which take precedence over generic rules.
Which condition indicates a cracked heat exchanger in a gas furnace?
Answer: Yellow or orange burner flame
A cracked heat exchanger allows combustion gases to mix with supply air, causing the burner flame to roll out or appear yellow/orange due to disrupted airflow.
What does SEER stand for in relation to air conditioning equipment?
Answer: Seasonal Energy Efficiency Ratio
SEER (Seasonal Energy Efficiency Ratio) measures cooling output divided by electrical energy input over a typical cooling season.
A home inspector notices the condensate drain line on an air handler is dripping water at the connection joint. What should be reported?
Answer: Improper drain line installation or joint failure requiring repair
A leaking condensate drain joint indicates a failed or improperly installed connection that can cause water damage and should be repaired by a qualified technician.
Which component in a heat pump system reverses the refrigerant flow to switch between heating and cooling modes?
Answer: Reversing valve (four-way valve)
The reversing valve (four-way valve) redirects refrigerant flow so the heat pump can absorb heat from outside in winter or reject heat outside in summer.
What is the recommended maximum temperature rise across a gas furnace heat exchanger?
Answer: 35–70°F
Most gas furnaces are designed for a temperature rise of 35–70°F across the heat exchanger; values outside this range indicate airflow or equipment issues.
During an inspection, you observe rust staining and moisture around the base of a furnace flue pipe. What is the most likely cause?
Answer: Flue gas backdrafting or improper venting
Rust and moisture at a conventional furnace flue indicate that combustion gases are condensing inside the vent, typically due to backdrafting or undersized flue pipe.