"SPST
Ranco A22-1112 Temp Control SPST Range with a 25F to 44F Differential 5F 72" Capillary
The A22-1112, 72" capillary wrapped electric "Range Thermostat" is a common control used in residential heating and cooling systems. It uses P and T (Pressure and Temperature) sensor switches to monitor whether the heating or cooling system is on or off. This thermostat should be installed in a housing using two wires, black to the common at the bottom terminal and red to the top terminal. The SPST (Single Pole Single Throw) operation switches power to your system for either ON or OFF. When the valve is in the ON position power flows through to the coil of your unit.