This HVAC sequencer relay is engineered for precision

OEM Precision Fit: Eliminates the need for manual trimming

This is a double-inlet centrifugal wheel

providing long-term reliability for professional contractors focusing on Danfoss heating controls and energy-efficient hydronic upgrades

Common Questions How do I confirm the rotation

Lennox 33J38 Limit Switch This HVAC sequencer relay isThe Lennox 33J38 is a high precision 115 145F auto limit switch engineered to maintain critical thermal safety within residential and commercial HVAC systems. This Normally Closed (N. C.) disc style control, part of the Lennox 36T series, acts as a primary safety mechanism that monitors heat exchanger temperatures to prevent overheating. Operating on a fixed 115 145 degree Fahrenheit range, the switch is designed to open on temperature rise at 145F,