For large floor heating applications, the programmable thermostat can be extended with additional Power Relay Modules. This relay module features a built-in Class A GFCI and increases output by 15 amps per module.

• Suitable for 120V or 240V Applications
• 15A Output Relay
• Maximum load 120V = 1,800 Watts; 240V = 3,600 Watts
• For use ONLY with the Programmable Thermostat
• Built-in Class A 5 mA GFCI with GFCI test light*
• 3-year Manufacturer Warranty
• Dimension: 4.8x3.0x1.0 inches (123x75x25mm)
• Easy Connections
• Fits single-gang (2-inch box) box. A double-gang (4-inch box) is recommended for more room to work with multiple mats.
• Backside connection box dimensions: 1.682"W x 2.686"H x 1.2"D
• LINE wires: connect to 2 middle screws marked L1, L2.
• LOAD (mat) wires connect to 2 screws marked LOAD 1800W/3600W MAX 15A.

Thermostat/power module connection: Loosen bottom screws, lift off covers, insert minimum 20 AWG wire through oval hole in back of both components, connect thermostat A and B terminals marked "OUT" to power module C and D terminals marked IN/SEN.