Lennox 78W99 Limit Switch 318973-401 The Johnson Controls MP823E001E Valve

The Johnson Controls MP823E001E Valve Actuator is a heavy-duty pneumatic valve actuator engineered for precise proportional control in commercial HVAC systems

offering improved internal components while maintaining the same 1 1/2" footprint and 120V specifications

90 inch water column rating matches the original equipment specification on the unit's data plate to maintain HVAC system safety and efficiency

This high pressure cutout switch acts as a primary defensive layer

Lennox 78W99 Limit Switch 318973-401 The Johnson Controls MP823E001E ValveThe Lennox 78W99 Limit Switch is a critical safety component engineered to regulate heat exchanger temperatures within Lennox G40, G41, G50, G51, and G61 gas furnaces. This L235 30F thermal limit control features a fixed temperature setting, designed to open the electrical circuit at 235F and automatically reset once temperatures drop by a 30F differential. Precision calibrated for high limit protection, this SPST (Single Pole Single Throw) switch