Pentair Air Flow Switch For MasterTemp And Max-E-Therm Heaters | 42001-0061S Pentair EasyTouch Transformer When laying out the deck

When laying out the deck work

compatible with heaters made before 11/20/2014

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

Note: This Pressure Switch may be compatible with your heater

Pentair Air Flow Switch For MasterTemp And Max-E-Therm Heaters | 42001-0061S Pentair EasyTouch Transformer When laying out the deckThe 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