The Armstrong Series 811 is typically rated for temperatures up to 450°F (232°C) in standard configurations

designed to seat within a compatible Chatleff distributor assembly commonly found on York and Luxaire equipment

Robust Electromagnetic Force: Delivers high-torque response to ensure positive opening and closing of the solenoid valve under pressure

including eight bolts and nuts

making it ideal for standard blower motor applications

Lennox 75M31 Limit Control 30067439-890 The Armstrong Series 811 isThe Lennox 75M31 Limit Control is a critical OEM replacement part designed to maintain safe thermal operating parameters within residential and commercial HVAC systems. As a primary high limit switch, this component utilizes a precise L170 40F calibration, meaning the normally closed contacts are engineered to open when the heat exchanger surface temperature reaches 170F. Once the circuit is interrupted, the burner ignition or heating source is