Rock the Gas Heat ESCO Exam 2025 – Fire Up Your Future in HVAC!

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What role does a pressure switch play in a gas heating system?

It increases airflow for combustion

It monitors fuel levels

It detects pressure in the exhaust system

A pressure switch is a crucial safety and operational component in a gas heating system that primarily detects pressure in the exhaust system. Its main function is to monitor the pressure to ensure that the exhaust gases are being vented properly. If the pressure falls outside of predetermined limits, the pressure switch can prevent the system from operating, thereby ensuring that dangerous gases do not leak into the living space and that the heating appliance is functioning safely and efficiently.

By detecting the presence of adequate pressure in the exhaust system, the pressure switch helps to confirm that the system is venting correctly and that combustion is occurring under safe conditions. This is particularly important in preventing backdrafts, which could lead to hazardous situations. The ability of the pressure switch to respond to changes in pressure is vital for the reliability and safety of the heating system.

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It shuts off gas supply during maintenance

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