Features T451A provides heating control only. T651A provides heating and cooling control. T694A,B,D,F supplied with switching subbase to provide manual control of heating, cooling and fan. Thermostats utilize spst or spdt snap switches activated by bimetal sensor. Options include adjustable range stops, locking cover, concealed set point, locking set point, positive off control, cover thermometer.
Contacts make on temperature fall.
Heating contacts break and cooling contacts make on temperature rise. Heating contacts break and cooling contacts make on temperature rise. 35 F to 95 F. -Spdt switch breaks heating contacts and makes cooling contacts on temperature rise.