CHI Heating, Ventilation, & Air Conditioning (HVAC) Inspection 3

Question 1

Which type of filter has the highest MERV rating capability and provides the best filtration for an HVAC system?

Accepted Answer

HEPA filters

Answer

HEPA filters achieve MERV 17-20 ratings, capturing 99.97% of particles 0.3 microns and larger, making them the highest-efficiency option for HVAC systems.

Question 2

When inspecting a boiler system, what does a consistently high-pressure reading on the pressure gauge indicate?

Accepted Answer

The expansion tank may be waterlogged or failed

Answer

Consistently high pressure in a boiler system typically indicates a waterlogged or failed expansion tank, which can no longer absorb pressure fluctuations as water expands when heated.

Question 3

What is the purpose of the flue gas spillage test performed near a draft hood on a natural draft furnace?

Accepted Answer

To detect if combustion gases are backdrafting into the living area

Answer

A spillage test—typically using a match or smoke pencil near the draft hood—determines whether combustion gases are being properly exhausted or are spilling back into the living space.

Question 4

A home inspector observes rust staining and corrosion on the exterior of a central air conditioner's refrigerant line set insulation. What does this MOST likely indicate?

Accepted Answer

Condensation forming due to damaged or missing insulation

Answer

Rust and corrosion on line set insulation typically indicates that the insulation is compromised, allowing condensation to form on the cold suction line and cause moisture damage.

Question 5

Which condition would require a home inspector to recommend evaluation of a ductless mini-split system by a qualified HVAC technician?

Accepted Answer

Oil staining is visible around the refrigerant line connections at the outdoor unit

Answer

Oil staining around refrigerant line connections indicates a refrigerant leak, since refrigerant oil travels with the refrigerant and leaves visible residue at leak points.

(CHI) Certified Home Inspector Practice Test

(CHI) Certified Home Inspector Practice Test

CHI Heating, Ventilation, & Air Conditioning (HVAC) Inspection 3