Robertshaw 705-502 Millivolt Operator

The Robertshaw 705-502 Millivolt Operator is a high-performance gas valve operator designed for the field conversion of 700 and 710 Series manual gas valves to wall thermostat control. This natural gas millivolt actuator features a factory-preset 3.5" WC pressure regulator, ensuring stable manifold pressure for consistent burner performance. Engineered for reliability in 250mV to 750mV systems, this operator features a heavy-duty diaphragm and spring assembly housed in a rugged block (available in red or gray). As a veteran technician knows, the integrity of the seal is paramount; this kit includes the necessary gasket and mounting screws to maintain a leak-free enclosure during installation. It serves as a direct professional-grade replacement for specific 700-450 and 700-500 series components, delivering precise heating control for gas fireplaces, floor furnaces, and wall heaters. Note that this unit is specifically calibrated for natural gas and is not compatible with 700-800 Series bleed gas controllers.

• Field Conversion Ready: Simplifies the transition from manual control to millivolt thermostat operation on compatible Robertshaw valves.
• Integrated Regulation: Features a factory-set 3.5" WC NG regulator, eliminating the need for external regulation in standard natural gas setups.
• Broad Compatibility: Engineered to fit a wide range of Robertshaw 700 Series and 710 Series valves commonly found in commercial and residential heating.
• Complete Installation Kit: Includes a fresh gasket and hardware to ensure a proper mechanical seal and secure mounting.
• Reliable Millivolt Logic: Operates efficiently within a 250mV to 750mV range, making it ideal for self-powered standing pilot systems.

Can the 705-502 be used with Liquid Propane (LP) systems?
This specific model is factory-calibrated for Natural Gas at 3.5" WC. For LP applications, a conversion kit or an LP-specific operator is required to ensure safe combustion and proper manifold pressure.

Does this operator work with 24V or 120V systems?
No, the 705-502 is a millivolt operator. Attempting to apply line voltage or 24VAC to the terminals will result in immediate component failure and poses a significant safety risk.

Is this a compatible replacement for the Robertshaw 7000GO?
No. This operator must not be used on 700-800 Series Bleed Gas Controllers (7000GO). Using this part on a bleed-style valve will prevent proper operation and create an unsafe condition.

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.