Pentair Air Flow Switch For MasterTemp And Max-E-Therm Heaters | 42001-0061S Pentair EasyTouch Transformer compatible with heaters made before

compatible with heaters made before 11/20/2014

Note: This Pressure Switch may be compatible with your heater

Water Chemistry Guide:Included in the set is a waterproof copy of the Pool and Spa Water Chemistry Guide

providing quick and efficient ignition

and long operating cycles

Pentair Air Flow Switch For MasterTemp And Max-E-Therm Heaters | 42001-0061S Pentair EasyTouch Transformer compatible with heaters made beforeThe 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