Honeywell Gas solenoid valves VR4605QB2002U

The Honeywell VR4605QB2002U is a gas solenoid valve designed for safe gas flow control in residential heating systems, boilers, and water heaters. It features two electric actuators for safety and main valve control, with a maximum inlet pressure of 60 mbar and a flow capacity of 4.2 m³/h at a pressure drop of 3 mbar. The valve has a compression fitting connection, a 2.8 mm output aperture, and includes flow indication in m³/h. It is CE certified and supports pilot flow, with a back pressure of 50 mbar on the first valve.

When selecting a replacement gas valve of this type, ensure the connection thread matches the existing piping, typically compression fitting. Verify the maximum inlet pressure and flow capacity meet the system requirements. Check the coil connection type, as it may be top-connected, and confirm the output aperture size. Measure the physical dimensions and mounting hole positions to ensure compatibility with the burner or boiler.

Common failures include coil burnout, leading to the valve not opening or closing properly, causing burner ignition issues or gas flow interruptions. Diaphragm wear can result in pressure instability or leakage. If the valve fails to regulate, check the inlet pressure and the condition of the internal filter. Symptoms may include inconsistent flame, failure to ignite, or unexpected shutdowns.