Service & TroubleshootingCâu 84 / 110
A furnace that heats briefly then shuts off repeatedly before satisfying the thermostat is exhibiting what?
a.Normal operation
b.A refrigerant leak
c.Short cycling
d.High subcooling
Giải thích
Short cycling is repeated brief on-off operation before the space reaches setpoint, often caused by an overheating limit trip, a dirty flame sensor, oversizing, or restricted airflow. It wastes energy and stresses components. Diagnosis targets airflow, the limit switch, and flame sensing.
Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- SEER (or SEER2) is a rating that describes what?
- AFUE is the efficiency rating used for what equipment?
- HSPF (or HSPF2) rates the seasonal efficiency of what?
- A dirty flame sensor on a modern furnace most commonly causes what symptom?
- When measuring the actual airflow of an installed system, which measurement helps diagnose a restrictive duct system?
- A capacitor that reads well below its rated microfarad value should be treated how?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-20 Warm-Air HVAC Trade Exam · Quy trình kiểm tra