What is the difference between 632477 and 632477R

Mixing tubes are typically required for duct-mounted sensors (TS121/TS211) rather than wall-mounted space sensors

Key Benefits Constant Duty Cycle: Engineered for continuous ignition sequences without performance degradation

Built on a 48YZ NEMA frame

Utica-Dunkirk 29198 Limit Switch 320788-702 What is the difference betweenThe Utica Dunkirk 29198 Limit Switch is a critical high limit safety control designed for hydronic and forced air heating systems. Engineered for precision, this L140 20F limit switch features a 140F opening threshold and a 20F differential, ensuring the burner cycles off before internal temperatures exceed safe operating parameters. As a professional grade HVAC high limit control, it utilizes a bimetal disc for snap action switching, providing rapid