the Parker 77340 is specifically wound for 480VAC operation

05" orifice capacity

Direct 120V Operation: Designed for standard 120VAC power supply circuits

What causes the valve to 'chatter' or fail to hold after replacement

or EB5 models

Lochinvar & A.O. Smith 100109834 Gas Valve 321894-708 the Parker 77340 is specificallyThe 100109834 Gas Valve is a direct replacement service part engineered for high performance Lochinvar Knight and A. O. Smith high efficiency boilers. This combination gas control valve is configured for Natural Gas applications, featuring a 1 2" NPT inlet outlet and a standard 24V AC solenoid operator. Designed to maintain stable manifold pressure, it operates at a 3. 5" W. C. regulation setpoint. Reliable ignition and consistent BTU output depend on