Resideo T104B1038 Actuator

The Resideo T104B1038 is a high-performance non-electric thermostatic radiator valve actuator designed for precise hydronic temperature control. This self-contained thermostatic operator features a remote setpoint and sensor configuration with a 6' 8" capillary tube, making it the ideal solution for applications where the radiator is recessed, covered, or located in an inaccessible area. By utilizing a liquid-filled thermal element, the T104B1038 ensures responsive and accurate modulation of heating fluid, effectively preventing hydronic system overheating and optimizing energy efficiency across the loop. This model is compatible with Honeywell V110 series valves and provides a reliable mechanical interface for balancing room-by-room comfort without requiring external power or wiring. Its robust construction is engineered for long-term HVAC zone control, maintaining setpoint stability even in demanding commercial or residential retrofits where TRV remote sensing is a technical necessity for proper calibration.

• Remote Sensing Capability: The 6' 8" capillary allows for accurate ambient temperature monitoring away from the heat source, eliminating sensor interference from radiator enclosures.
• Non-Electric Operation: Operates entirely on thermal expansion, reducing installation complexity and electrical failure points in hydronic heating systems.
• Precise Throttling: Provides proportional control to maintain consistent room temperatures, reducing boiler cycling and improving overall radiator valve efficiency.
• Frost Protection: Includes an integrated freeze protection setting to prevent pipe bursts in unoccupied spaces during extreme low-temperature events.
• Simplified Integration: Designed for direct mounting on Honeywell V110 and V100 valve bodies, ensuring a secure, leak-free mechanical connection.

How do I troubleshoot poor temperature regulation with a remote sensor?
Ensure the sensor bulb is mounted horizontally and away from drafts or direct sunlight. If the capillary is kinked or the sensor is too close to the radiator fins, it will cause short-cycling or inaccurate valve modulation.

Is the T104B1038 compatible with steam systems?
This actuator is primarily designed for hot water hydronic systems. For steam applications, verify the valve body pressure ratings and ensure the actuator is paired with a steam-rated thermostatic valve body to prevent diaphragm failure.

Can the capillary tube be extended or shortened in the field?
No, the 6' 8" capillary is a sealed system containing the thermal charge. Cutting or altering the tube will render the unit inoperable and compromise the calibration of the thermostatic actuator.

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.