Description
The Modine 5H0730570002 M/R Block Vent Switch L260F is a high-limit thermal switch rated at 260F that monitors exhaust gas temperature within the venting pathway of a heating unit. It is wired into the control circuit and opens the electrical contact when exhaust temperatures exceed the rated threshold, activating a shutdown to prevent heat buildup from reaching unsafe levels within the vent block. Within HVAC heating systems, this switch acts as a safeguard along the exhaust side of the appliance, cutting power to the burner assembly when restricted or blocked venting causes abnormal thermal conditions in the flue passage.
