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

2 Cv rating and a 500:1 rangeability

This SPST relay is engineered to manage high-current loads

Key Benefits Ensures a gas-tight seal with the included P100100 gasket to prevent carbon monoxide leakage into the living space

providing a durable solution for high-traffic air handling units and zone control systems

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