Snap Disc Fan Limit Control- for Wood Boiler Furnaces

If your fans are not going on when they should here is the culprit... Most outdoor wood boilers have these on their units, it protects the units from boiling over.
SPST Fan Limit Control Thermostat Snap Disc Auto Reset, Opens 190
Technical Specs

    Item Snap Disc Control
    Type Limit, Automatic Reset
    Switch Action Open on Rise
    Switch Type SPST
    Temp. Range (F) 150 to 190
    Height (In.) 1
    Width (In.) 2-3/4
    Depth (In.) 1-1/2
    Circuit #1 Switch Closes @ (F) 150

    Circuit #1 Switch Opens @ (F) 190
    Differential 40
    Inductive Amps @ 120V 10
    Inductive Amps @ 240V 5
    Pilot Duty Contacts (VA) 125
    Resistive Amps @ 120V 25
    Resistive Rating 240V 25
    Resistive Amps @ 277V 21.6
    Voltage Range 120 to 277