Lennox 71L45 Gasket 321702-401 Contractors

Contractors

The McDonnell & Miller 307000 Snap Switch (Model Number FS7-31) is an essential replacement SPDT snap-action switch designed for field repairs of high-performance liquid flow switches and air flow switches

Measure the resistance across the sensor leads and compare the reading to a standard Carrier thermistor resistance chart based on the current ambient temperature at the probe

spring-return pneumatic actuator ensures the valve returns to the open position upon loss of air pressure

utilizing this exact factory-spec switch is mandatory to maintain the system's UL/CSA combustion certification and ensure seamless integration with the integrated control board

Lennox 71L45 Gasket 321702-401 ContractorsThe Lennox 71L45 is a critical Flue Collector Box Gasket designed to maintain the structural integrity of the combustion path in high efficiency furnace repair applications. This high temperature sealing component is engineered to eliminate exhaust gas bypass by creating a gas tight seal between the flue collector box and the heat exchanger interface. For technicians, ensuring a zero leak seal is essential to prevent CO leakage and maintain proper