Pressure Switch

A Pressure Switch is a safety sensor that monitors the pressure of fluids (gas, oil) or air in the burner system. It acts as an electrical switch that trips (opens the safety circuit) if the pressure goes outside a preset safety range.

Common Types in Burners

1. Low Gas Pressure Switch (Min Gas)

• Function: Monitors the incoming gas supply pressure.
• Trip Condition: If pressure drops below the minimum required for safe combustion (e.g., due to a supply issue), it shuts down the burner to prevent unstable flame or flashback.

2. High Gas Pressure Switch (Max Gas)

• Function: Monitors pressure after the regulator.
• Trip Condition: If pressure rises too high (e.g., regulator failure), it shuts down the burner to prevent over-firing and dangerous CO levels.

3. Air Pressure Switch

• Function: Verifies that the burner fan/blower is generating sufficient air pressure/flow.
• Trip Condition: If the fan fails or the air intake is blocked, it prevents the burner from firing (or continuing to run) to avoid a fuel-rich explosion hazard.