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The control panel located on the top panel can be rotated to any of the three sides of the heater for easy access
providing long-lasting performance and reliability
Proper seating supports long-term performance
part number 9-100-1108
streamlining filter maintenance for hassle-free operation
Pentair Air Flow Switch For MasterTemp And Max-E-Therm Heaters | 42001-0061S Pool Enzyme and clarifier solution The control panel located onThe OEM Pentair air flow switch (AFS), which senses the pressure drop across the air metering orifice. The air flow switch (AFS) senses the pressure drop across the air metering orifice. As soon as there is sufficient air flow, the AFS closes, closing the circuit to the hot surface igniter (HSI), which ignites the fuel mixture. On a call for heat, the blower and HSI are energized. In about 20 seconds, the gas valve opens and ignition occurs. The HSI
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