How Do You Connect A Line Voltage Thermostat?
Line voltage thermostats typically control baseboard heaters and attic ventilation fans. The line voltage thermostat comes in two pole types. The one-pole thermostat controls only a single supply power line or 120VAC. The double-pole thermostat controls a double supply power line or 220VAC. Use a double-pole, line voltage thermostat whenever you are controlling 220VAC electrical power. This ensures that all electrical power going to the device being controlled has no electrical energy going to that device if the thermostat is off. Observe the rear of the two-pole thermostat. There are four screw terminals. The top screw terminals are labeled “line.” The lower two screw terminals are labeled “load.” The screws are set to the outside of the thermostat, with a right hand set and a left hand set. Each set is like a single switch. When the thermostat is turned on, the right hand set makes contact, and the left hand set makes contact. The right hand set and the left hand set do not make cont
