Robertshaw 700-522 Gas Valve

The Robertshaw 700-522 is a professional-grade 1-inch NPT gas valve designed for high-capacity applications, delivering up to 720,000 BTU. This millivolt diaphragm gas valve is a versatile solution for contractors servicing a variety of commercial and residential systems, including large furnaces, boilers, and swimming pool heaters. Engineered for a 3.5" WC natural gas set point, this unit is also field-convertible for LP applications using the appropriate Robertshaw conversion kit.

As a slow-opening gas valve, the 700-522 ensures soft ignition, reducing burner stress and enhancing system longevity in high-demand environments. Its multiposition mounting capability allows for installation flexibility in tight mechanical rooms, provided the unit is not mounted upside down. It features standard NEMA terminals compatible with 250mV to 750mV thermopiles, including both coaxial and 2-lead configurations. The 7000MVRHC-S7C factory model includes a built-in pilot gas filter and an adjustable pilot key, ensuring the pilot safety valve operates within precise tolerances for reliable flame rectification and safety.

Key Benefits

• High BTU Capacity: Supports up to 720,000 BTU, making it an ideal swimming pool gas valve replacement or commercial boiler component.
• Soft Ignition Performance: The slow open feature prevents delayed ignition "thumps" by controlling the initial gas flow to the burner.
• Universal Compatibility: Fits 1" pipe applications and replaces various OEM gas valves from brands like A.O. Smith, State, and Raypak.
• Extreme Temperature Resilience: Rated for ambient operating temperatures ranging from -40°F to 175°F.
• Flexible Mounting: Can be installed in any orientation (except upside down) to accommodate existing manifold piping.

Common Questions

How do I test the millivolt output on the 700-522?
Use a multimeter set to the millivolt scale. Check the voltage across the TP/TH terminals while the pilot is lit. You should see a reading between 250mV and 750mV. If the voltage drops significantly when the thermostat calls for heat, the thermopile may be failing or there is a high-resistance connection in the circuit.

Can this valve be converted from Natural Gas to LP?
Yes. While factory-set for 3.5" WC Natural Gas, you can use the Robertshaw 1751-013 conversion kit to adapt this 700 series millivolt valve for liquid propane use.

What should I check if the pilot won’t stay lit?
First, verify that the thermopile is generating at least 250mV and is properly seated in the 1/4" pilot outlet flame. Inspect the pilot adjusting key setting and ensure the inlet filtered screen is not obstructed by debris from the gas line.

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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.