Kromschroder Gas pressure switch DG 35C8D-5W 84448350

The Kromschroder DG 35C8D-5W gas pressure switch (SKU 84448350) is a pressure switch designed for monitoring gas and air pressure in burner and boiler systems. It features an adjustable set point via a manual adjustment wheel and is compatible with natural gas, LPG, biogas, air, and flue gases. The switch uses a silicone-free diaphragm mechanism and a microswitch for stable operation. It is suitable for positive pressure monitoring and can be used in systems with negative or differential pressure depending on model compatibility. The device is compact, easy to install, and complies with European standards including EAC and RoHS.

When selecting a replacement gas pressure switch of this type, ensure the switching range, differential, connection thread or hose spigot size, electrical contact rating, and applicable approvals match the original. The switch is typically installed downstream of the gas filter and upstream of the gas valve. Before ordering, compare the setpoint range and differential with the equipment's requirements, and verify the impulse line connection size and type. Installation involves wiring the switch into the burner control circuit and adjusting the setpoint to the desired pressure threshold.

Common failure modes for gas pressure switches include diaphragm rupture, blocked impulse lines, and setpoint drift over time. A torn diaphragm or blocked impulse tube can cause false lockouts, which may be mistaken for ignition faults. If the switch fails to open or close at the correct pressure, the burner control may not receive the permissive signal, preventing ignition or causing a safety shutdown. Check the impulse line for blockages, inspect the diaphragm for damage, and verify the setpoint accuracy periodically.