• Ensure that wiring, protection and grounding comply with local regulations.
• Screw down all terminals regardless of whether cables are connected or not.
• Screw down the cables tightly and make sure no bare copper is exposed.
• Observe local regulations for wiring size and the rated value of the installed overcurrent protection device.
• Disconnect from power supply before removing the unit from its mounting plate.
• Ensure that power is switched off during wiring, including the power of the OpenTherm^® boiler.