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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
Replacing it with an OEM-grade Robertshaw 10-680 is the standard professional fix
It is technically identical to the Honeywell 4074ELR/U
The set point is adjusted by turning the internal calibration screw
Key Benefits High-Temperature Durability: Features specialized alumina ceramic insulation rated for extreme thermal stress in heavy-duty burner applications
Cleveland Controls DFSH-CO Switch Replacing it with an OEM-gradeThe Cleveland Controls DFSH CO is a heavy duty, field proven fixed point air pressure sensing switch specifically designed for high demand HVACR environments, including duct heaters, industrial ovens, and energy management systems. This differential pressure switch comes with a protective enclosure box and is factory calibrated to actuate at a fixed set point of 0. 4" W. C. (+ 0. 08"), eliminating the risk of field tampering or drift. As a direct