Kromschroder Gas pressure switch DG 120I-3 84447060

The Kromschroder DG 120I-3 (SKU 84447060) is a gas pressure switch designed to monitor negative pressure (vacuum) of gas and air in heating, combustion, ventilation, and air conditioning systems. It features an adjustable switching range, allowing manual setpoint adjustment without special tools. The switch is suitable for use in biogas plants and industrial gas mains, and is certified for the European market. It is an original component from the German manufacturer Kromschroder.

When selecting a replacement pressure switch of this type, the technician must match the switching range and differential to the burner's operating pressures, the connection thread or hose spigot size, the contact rating for the control circuit, and the approval class required by local regulations. The switch is typically connected between the gas filter and the gas valve, with an impulse line from the gas train. Verify these parameters against the existing switch before ordering.

Common failure modes for pressure switches of this type include a torn diaphragm, a blocked impulse tube, or a drifted setpoint. These failures often cause burner lockouts that may be mistakenly diagnosed as ignition problems. Confirming pressure switch function during troubleshooting is essential.