preventing HVAC direct spark ignition failure or intermittent ignition sequences

offering a reliable alternative to OEM components without compromising flow rate or material integrity

protecting sensitive components from reverse flow

Once the unit has cooled

ensuring linear heat output and superior comfort control

McDonnell & Miller 309100 Switch Els PW 29614 preventing HVAC direct spark ignitionThe McDonnell & Miller 309100 Switch, also known as the Model Number 11 Switch, is a heavy duty replacement switch kit designed for field repairs of float type low water cut offs. Engineered for automatic reset operation, this unit features two SPST switches that allow for simultaneous control of a burner circuit and a secondary function, such as an electric water feeder or a low water alarm. It is fully compatible with Series 61, 64, 67, 69, 764, and