it includes a changeover switch (SPDT) that can trigger an alarm circuit when the pressure differential falls below the setpoint range of 4

The diaphragm must be mounted in a vertical plane to achieve the lowest specified operating set point

reducing the risk of vibration-induced fatigue or component shifting

Whether you are dealing with a failed startup or inconsistent static pressure

Viessmann 7870851 Ignition Electrode 318518-761 it includes a changeover switchThe Viessmann 7870851 Ignition Electrode is a critical OEM replacement part engineered for precise combustion initiation in high efficiency Viessmann Vitodens boilers. As a primary component in the burner assembly, this electrode generates the high voltage spark required to ignite the gas air mixture, ensuring a stable flame signal and preventing ignition lockouts. Designed for the Vitodens 200 W and 222 F series, specifically for units ranging from