Kromschroder Tightness control TC1C05W/W 84765552

The Kromschroder TC1C05W/W 84765552 is a tightness control unit for gas solenoid valves, designed to check two safety valves before and after burner operation. It features an adjustable measurement time of 5–30 seconds, factory-set to 30 seconds, and operates within an inlet pressure range of 10–500 mbar. The device supports a valve opening time of 3 seconds, has a switching cycle rating of 250,000 cycles, and is suitable for medium and ambient temperatures from -20 to 60 °C. It is housed in impact-resistant plastic with IP65 protection, weighs 0.57 kg, and is certified to SIL 3 according to EN 61508.

Parts of this type are selected by verifying compatibility with the gas valve system, including inlet pressure range, measurement time adjustability, and electrical specifications such as input current (max 5000 mA) and cable cross-section (0.75–2.5 mm²). Installation requires matching the device's mounting form, typically with 5 cable glands of M16 x 1.5, and ensuring the ambient and storage temperature limits are respected. The unit must be connected to the safety valves and control inputs as per the manufacturer's wiring diagram, with attention to the protection of valve outputs and fault signal terminals.

Common failure modes for tightness control units include leakage detection errors, which may cause the burner to lockout or fail to start. Symptoms can include repeated reset attempts, fault signals on terminal 12, or the unit not completing its measurement cycle. Check for correct inlet pressure, clean and dry gas supply, and proper electrical connections, as condensate or contamination can affect performance. If the unit fails to reset or shows persistent faults, it may need replacement.