InterNACHI HVAC Systems Analysis 2

Question 1

What is the typical minimum clearance required between a gas furnace and combustible materials?

Accepted Answer

Per manufacturer specifications

Answer

Clearance requirements vary by furnace model and must follow the manufacturer's installation instructions, which take precedence over generic rules.

Question 2

Which condition indicates a cracked heat exchanger in a gas furnace?

Accepted Answer

Yellow or orange burner flame

Answer

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.

Question 3

What does SEER stand for in relation to air conditioning equipment?

Accepted Answer

Seasonal Energy Efficiency Ratio

Answer

SEER (Seasonal Energy Efficiency Ratio) measures cooling output divided by electrical energy input over a typical cooling season.

Question 4

A home inspector notices the condensate drain line on an air handler is dripping water at the connection joint. What should be reported?

Accepted Answer

Improper drain line installation or joint failure requiring repair

Answer

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.

Question 5

Which component in a heat pump system reverses the refrigerant flow to switch between heating and cooling modes?

Accepted Answer

Reversing valve (four-way valve)

Answer

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.

(InterNACHI) International Association of Certified Home Inspectors Practice Test

(InterNACHI) International Association of Certified Home Inspectors Practice Test

InterNACHI HVAC Systems Analysis 2