Robertshaw 700-502 Gas Valve

The Robertshaw 700-502 Millivolt Gas Valve is a professional-grade combination gas control designed for standing pilot systems in commercial and residential heating. This 7000AMVR series valve features a 1/2" NPT inlet and 1/2" NPT outlet with additional side taps, offering a high-capacity throughput of 100,000 BTU. Engineered for wall thermostat actuation, it operates on a 250mV to 750mV signal, making it a reliable choice for furnaces, wall heaters, and boilers without requiring external line voltage. The unit comes factory-set for Natural Gas at a 3.5" WC regulation point, though it is field-convertible with the appropriate regulator kit. Techs will appreciate the straight-thru design and the inclusion of reducer bushings for versatile 1/2" x 3/8" applications. Built with a separate automatic pilot safety valve, it ensures immediate gas shutoff during pilot outage, maintaining system integrity in demanding environments.

Key Benefits

• Universal Installation: Multi-positional mounting capability (except upside down) allows for easy retrofitting in tight mechanical closets or equipment housings.
• Broad Compatibility: Replaces a wide range of Honeywell VS8148 and Allpoints millivolt valves used in vintage and modern gas-fired appliances.
• Reliable Pilot Safety: Features an independent automatic safety magnet and a manual gas cock (Off-Pilot-On) for standard service procedures.
• Integrated Protection: Includes inlet filtered screens and a pilot gas filter to prevent debris from fouling the internal diaphragm or orifices.

Common Questions

Can I use this gas valve for LP (Propane) applications?
The 700-502 is factory-configured for Natural Gas. To use it with LP, you must install a 1751-013 regulator conversion kit to achieve the required 11.0" WC pressure. Always verify the orifice size of the appliance before conversion.

Does this valve require a specific thermopile connection?
This model is designed for use with standard two-lead thermopiles. It features combination screw/spade terminals (1/4" and 3/16" NEMA standards) to ensure secure electrical contact and prevent miswiring during field replacement.

What should I check if the valve fails to open?
First, verify the millivolt output of the thermopile under load. If the closed-circuit reading is below 100mV, the valve may not actuate. Also, ensure the thermostat wiring hasn't exceeded the maximum recommended length for 750mV systems.

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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.