Safety & CodesPregunta 107 de 110
A furnace's high-limit (temperature limit) switch protects the equipment by doing what?
a.Metering gas continuously
b.Shutting off the burners if the furnace overheats
c.Increasing blower speed permanently
d.Recovering refrigerant
Explicación
The high-limit switch senses excessive heat exchanger temperature, typically from low airflow, and shuts off the burners to prevent overheating and fire. Repeated tripping signals an airflow problem such as a dirty filter or failing blower. It is a key safety control that must never be bypassed.
Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- Why is a carbon monoxide alarm recommended or required in dwellings with fuel-burning appliances?
- Before working inside an energized electrical panel is unavoidable, a technician should do what to reduce shock risk?
- Adequate ventilation air in occupied buildings is important because it does what?
- When entering a permit-required confined space, atmospheric testing should be performed to check for what?
- A high-pressure safety switch on refrigeration equipment protects the system by doing what?
- Which practice best reduces the risk of heat illness for HVAC technicians working on hot rooftops?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con California CSLB C-20 Warm-Air HVAC Trade Exam · Cómo revisamos