White-Rodgers PG9A42JTL020 Pilot Generator

The White-Rodgers PG9A42JTL020 is a heavy-duty 750mV pilot generator engineered for high-output performance in standing pilot gas systems. This millivolt thermopile assembly features a specialized 90-degree right cobra type head porting, making it the go-to solution for tight burner configurations where standard vertical generators won’t clear. Built for the field, it utilizes 32-inch high-temp 2-wire leads terminated with F spade clip connectors for a secure, low-resistance connection to the gas valve terminal block.

This PG9 series pilot burner includes a single blue flame burner design for maximum stability and quiet operation. The integrated "snorkel" primary air path effectively incinerates ambient dust to prevent linting—a common failure point in residential and commercial furnaces. This unit is shipped ready for natural gas applications but includes an LP orifice for versatile field conversion. The stainless steel generator cover and flame ring surrounding the element ensure consistent 750 millivolt output and long-term reliability against flame impingement and oxidation.

• Cobra Head Design: 90-degree right porting allows for installation in compact heating appliance fireboxes.
• High-Output Thermopile: Delivers a reliable 750mV signal to operate millivolt-actuated gas valves without external power.
• Snorkel Air Path: Reduces maintenance calls by burning off dust and lint before they can clog the primary air intake.
• Field Versatility: Includes both Natural Gas and LP orifice fittings, ensuring compatibility across different fuel types.
• Extended Durability: Features a high-temperature stainless steel cover to withstand constant pilot flame exposure.

What is the difference between a 250mV and 750mV generator?
Standard thermocouples typically output 30mV to hold a safety magnet open, whereas a 750mV pilot generator like the PG9A42JTL020 produces enough voltage to actually power the entire gas control circuit and thermostat without needing a 24V transformer.

Can I use this to replace a straight-head thermopile?
The 90-degree right cobra head is specifically designed for offsets. While it functions electrically the same as straight models, you must verify that the physical orientation aligns correctly with your burner’s flame pattern.

How do I connect the F spade clip connectors?
These connectors are designed to slide directly onto the male terminals of your millivolt gas valve. Service technicians should ensure the connections are tight and free of corrosion to prevent voltage drops that could cause the valve to drop out.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.