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