Easy Installation: Mounts directly within the motor wiring box for a clean

simplifying field installation and restoring unit performance to original manufacturer standards without the need for mounting modifications or terminal adjustments

it breaks the circuit to the gas valve as a safety measure while keeping the fan energized to cool the heat exchanger

As an SPNO (Single Pole Normally Open) device

Disconnect the power and perform a resistance (ohms) test at room temperature

McDonnell & Miller 349500 Hook-Up 30067439-890 Easy Installation: Mounts directly withinThe McDonnell & Miller 349500, also identified by model number SA159 24, is a specialized lower quick hook up fitting engineered for seamless integration with steam boiler safety controls. This critical component serves as a direct replacement part for the McDonnell & Miller Series 47 and 47 2 mechanical water feeders, as well as the Model 64 A, 42A, 67, and 42S A low water cut offs. Designed for professional installation, it enables a reliable