The genuine OEM Pentair Air Flow Switch (42001-0061S) is the safety sensor that confirms adequate combustion air is reaching the burner before allowing ignition. It monitors the pressure differential across the air metering orifice; once airflow reaches the required threshold, the switch closes the circuit to the hot surface igniter (HSI), which lights the gas-air mixture. During a typical heating call, the blower and HSI energize simultaneously. Approximately 20 seconds later, the gas valve opens and ignition takes place. The HSI then transitions into flame-sensing mode, continuously verifying that a stable flame is present.

Key Benefits

• Precision Pressure Monitoring: Detects the pressure differential across the air metering orifice, confirming that airflow volume meets the threshold for safe ignition.
• Automated Ignition Sequence: Completes the electrical circuit to the hot surface igniter (HSI) the moment sufficient air is detected, triggering the fuel-air ignition process automatically.
• Fast Heating Response: Works in concert with the blower and HSI so that the gas valve opens and combustion begins within approximately 20 seconds of a heat demand signal.
• Continuous Flame Verification: Once the burner is lit, the HSI enters a dedicated sensing mode that continuously confirms flame presence, shutting down fuel flow if the flame is lost.
• Critical Safety Safeguard: Prevents gas from reaching the burner without verified airflow, protecting both the heater and surrounding area from unsafe operating conditions.

What's Included

• Air Flow Switch
• Clip
• Clear Tubes
• Bolts

Compatibility

• Compatible with most Pentair MasterTemp and Max-E-Therm Heaters

Specifications

• Brand: Pentair
• Part Number: 42001-0061S

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