42001-0061S Air Flow Switch for MasterTemp & Max-E-Therm Pool Heaters | Pentair

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 SEO Tags pentair pentair air flow switch for mastertemp and max-e-therm heaters 42001-0061S pentair flow switch mastertemp max-e-therm