HVAC Systems Quiz
PHIUS+ requires a separation distance of [?] between the ventilation intake and any known contamination source.
10 feet
For a very efficient air-source heat pump, heating COP (coefficient of performance) of [?] is a reasonable expectation.
3-4
Which of these choices does not provide overflow protection for bedrooms with closed interior doors while the ventilator is running?
A pressure switch in the supply register
What type efficiency rating would you expect to find for a gas/combustion-based space heating system?
AFUE
What is a potential problem with whole house fans?
Air leakage
Which of the following is a major difference between ASHRAE 62.2-2016 and PHIUS+ with regard to ventilation?
Assumptions about envelope air leakage rate
What common gas serves as a controlling variable for demand-controlled or advanced ventilation systems?
Carbon Dioxide
What part of an air-conditioning or heat pump system is outdoors?
Condenser
Which term best describes the ventilation system shown here?
Counterflow
How does a ceiling fan enhance summer comfort?
Creates moving air
Which function is an Energy Recovery Ventilator (ERV) not capable of?
Dehumidifying indoor air
What type of ventilation system would you choose for a building in a hot, humid climate?
Energy recovery ventilator (ERV)
Which of the following does a ducted mini-split system have that ductless system does not have?
Forced-air ducts
What are two key factors that affect the overall performance of a domestic hot water system?
Hot water heating efficiency, Hot water distribution efficiency
What are the two main components of the indoor unit of a ductless mini split system?
Indoor coil and fan
What is the minimum filter level required for fresh-air ventilation for PHIUS+ projects?
MERV 8
What building pressure difference with outdoors exist inside a building when a whole-house fan is operating
Negative pressure
What component does a heat pump have that an air conditioner does not?
Reversing valve
What function does this HRV perform that most HRVs sold do not perform?
Space conditioning
Evaporative coolers are best suited for [?] climates.
dry
An HRV is suitable for [?] climates.
heating‑dominated, dry
