Weil McLain 635-100-023 Actuator

When the hydronic performance of a Weil-McLain CGT Series boiler hangs on the precision of domestic hot water priority, the Weil McLain 635-100-023 Actuator is the critical component you need to restore system balanced flow. This 24Vac motorized 3-way valve actuator is an exact-fit replacement designed to mount directly onto the boiler's water trim assembly. Engineered for high-cycle reliability in residential heating applications, it manages the redirection of medium between heating zones and domestic hot water production with a 6VA power draw.

For technicians in the field, this genuine Weil-McLain replacement part serves as the direct cross-reference for the Honeywell VC8710-11 or VC8710-03 actuators. The compact housing allows for efficient swaps in tight boiler cabinets, while the multi-directional design ensures trouble-free installation onto existing 3-way valve bodies. Replacing a failed boiler actuator is essential when troubleshooting "no hot water" calls or "priority override" failures where the valve plunger is no longer actuating despite proper voltage signals from the control module.

Key Benefits:

• OEM Precision Compatibility: Specifically designed for Weil-McLain CGT Series 1 and Series 2 gas-fired boilers.
• Industrial-Grade Signal Response: Operates on a standard 24V hydronic control circuit with a 25 in-lbs torque rating for positive valve seating.
• Drop-in Replacement: Serves as the factory-authorized swap for 635-100-023, ensuring the harness connectors and mounting brackets align perfectly.
• Reliable Flow Management: Actuates the 3-way valve diverter to maintain consistent loop temperatures and prevent short-cycling.

Common Questions:

Does this actuator replace the Honeywell VC8710 series?
Yes, this is the OEM equivalent of the Honeywell VC8710-11. It is functionally identical and uses the same mounting interface for CGT water trim valves.

Do I need to replace the entire valve body?
Not necessarily. If the valve body is free of mineral buildup and the plunger moves freely, replacing just the 635-100-023 actuator typically resolves electrical or motor failure issues.

What are the signs of a failing actuator?
Common indicators include the boiler failing to switch to domestic hot water mode, the valve "sticking" in one position, or a lack of response to 24V calls from the control board.

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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.