and SP745 ignition control units

This is often caused by carbon buildup on the flame sensor or a cracked insulator

effectively monitoring internal heat exchanger temperatures to prevent thermal overloads

Technical specifications must be verified against the manufacturer's data plate before cross-application

Trane VAL3519 Gas Valve 320734-701 and SP745 ignition control unitsThe Trane VAL3519 is an OEM 1 2" 24V Natural Gas Valve engineered for precise fuel regulation in residential and light commercial heating systems. As a veteran grade replacement part, this dual redundant solenoid valve ensures reliable ignition and consistent manifold pressure, effectively eliminating issues like delayed ignition or intermittent burner hangups. The unit features a standard 1 2 inch NPT inlet and outlet, designed for seamless