It appears as if it is wired as a 1-pole thermostat would be. Only disconnect one factory connector. The thermostat works by sensing the temperature of the room and controlling the amount of current that passes through the wires to the heater. Connect the white supply wire coming from the circuit breaker to the same color supply wire feeding to the baseboard heater. In a true 240-volt circuit (not a 120/240-volt circuit, such as a dryer or range circuit), both the black and white wires are hot; there is no separate neutral wire, as there is with a 120-volt circuit. These preliminaries will be already be handled if you are replacing an existing thermostat, but a new heater installation will involve running a new cable, installing a new electrical box, and mounting a baseboard heater on the wall. Remove the appropriate electrical knockout from the back of the heater and thermostat accessory if needed. Connect one supply wire to one thermostat wire marked L1. 2. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. It's economical, yet rugged. The supply wiring can enter the raceway without using a knockout if needed. If it does have a green grounding lead, join this to the other circuit grounding wires. *Please note: Cable connector must be purchased separately. Setting up Mysa. For best results, place the heater under a window. The heater includes nail point marks showing correct locations for mounting holes. A new lin… If not, the arrangement will not function as it ought to be. If wiring on the right, disconnect factory connector B. Most will specify either a single-pole or double-pole thermostat, though some may allow either type. Connect one supply wire to one thermostat wire marked L1. It shows the components of the circuit as simplified shapes, and the power and also signal links in between the devices. Leave the red wire disconnected and cap loose end with an approved wire connector, or wrap loose end with electrical tape. By using The Spruce, you accept our, How to Wire a 240-Volt Double-Pole Thermostat, How to Wire a 240-Volt Single-Pole Thermostat, How to Install a Line Voltage Thermostat for a Baseboard Heater, How to Make Pigtail Electrical Wire Connections, Understanding Electric Water Heater Wiring, How to Repair a Wall-Mounted Electric Heater, How to Replace a Standard 120-Volt Outlet Receptacle, How to Install a 240-Volt Electric Baseboard Heater, How to Wire and Install Single-Pole Switches, How to Install a Single-Pole Dimmer Light Switch, Understanding Electrical Grounding in Household Wiring, How to Wire an Electrical Circuit Breaker Panel, How to Fix a Hot or Buzzing Dimmer Switch. Connect the wires in the same fashion to the second baseboard heater. Most baseboard heating systems use 240-volt circuits, but 120-volt heaters are also available, as they are often used to provide supplemental heat in individual rooms that are also served by a central heating system. Do not install heater against vinyl wallpaper, paperboard, or low-density fiberboard surface. Route ground wire to the baseboard heater. This is also a hot wire, but in this case, it bypasses the thermostat and runs directly to the heater(s). Typically, this is done with a short green or bare copper wire attached to the metal box with a green grounding screw, with the other end of the pigtail joined to the circuit grounding wires with a wire connector. Choose the type of thermostat specified by the manufacturer of the baseboard heater. Route remaining thermostat wires marked T1 and T2 to the baseboard heater. 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