HVAC - Intro to HVAC - Chapter 1
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
Why is regular coil cleaning necessary?
✔✔To maintain heat transfer efficiency.
What is the purpose of a condensate pump?
✔✔To remove water when gravity drainage is not possible.
Why is proper refrigerant piping size critical?
✔✔To maintain pressure drop and efficient system operation.
What is the role of a thermostat anticipator?
✔✔To prevent overshooting the desired temperature.
Why is measuring superheat and subcooling important?
✔✔To verify proper refrigerant charge.
What is the difference between a two-stage and single-stage furnace?
✔✔A two-stage furnace has high and low heat settings for comfort and efficiency.
Why is vibration isolation used in HVAC equipment?
1
, ✔✔To reduce noise and mechanical wear.
What is the role of a backflow preventer in hydronic systems?
✔✔To prevent contaminated water from entering the potable supply.
What is a common cause of ice formation on an evaporator coil?
✔✔Restricted airflow or low refrigerant.
Why is refrigerant oil important?
✔✔To lubricate the compressor and ensure proper operation.
What is the purpose of a charge check in an HVAC system?
✔✔To ensure the refrigerant level is correct for efficient performance.
What is the main role of a split-system air conditioner?
✔✔To separate heat exchange processes between indoor and outdoor units for efficiency.
What is the purpose of a flame sensor?
✔✔To detect ignition and ensure safe furnace operation.
Why is duct insulation critical for energy efficiency?
✔✔To prevent heat loss or gain during distribution.
2
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
Why is regular coil cleaning necessary?
✔✔To maintain heat transfer efficiency.
What is the purpose of a condensate pump?
✔✔To remove water when gravity drainage is not possible.
Why is proper refrigerant piping size critical?
✔✔To maintain pressure drop and efficient system operation.
What is the role of a thermostat anticipator?
✔✔To prevent overshooting the desired temperature.
Why is measuring superheat and subcooling important?
✔✔To verify proper refrigerant charge.
What is the difference between a two-stage and single-stage furnace?
✔✔A two-stage furnace has high and low heat settings for comfort and efficiency.
Why is vibration isolation used in HVAC equipment?
1
, ✔✔To reduce noise and mechanical wear.
What is the role of a backflow preventer in hydronic systems?
✔✔To prevent contaminated water from entering the potable supply.
What is a common cause of ice formation on an evaporator coil?
✔✔Restricted airflow or low refrigerant.
Why is refrigerant oil important?
✔✔To lubricate the compressor and ensure proper operation.
What is the purpose of a charge check in an HVAC system?
✔✔To ensure the refrigerant level is correct for efficient performance.
What is the main role of a split-system air conditioner?
✔✔To separate heat exchange processes between indoor and outdoor units for efficiency.
What is the purpose of a flame sensor?
✔✔To detect ignition and ensure safe furnace operation.
Why is duct insulation critical for energy efficiency?
✔✔To prevent heat loss or gain during distribution.
2
