Danfoss 193B-1704 Thermostat

The Danfoss 193B-1704 Thermostat, typically integrated within the ESBE VTC511 series, is a high-performance thermal loading valve element designed for solid fuel boilers and biomass heating systems. Operating with a 140°F (60°C) opening temperature, this thermostatic combustion control ensures the boiler reaches its optimal working temperature rapidly, preventing flue gas condensation and reducing tar fouling on heat exchanger surfaces. By maintaining a high return temperature, the 193B-1704 significantly extends the service life of the boiler vessel and improves total system combustion efficiency. This robust component utilizes a wax-filled thermal actuator to provide precise mechanical modulation without external power. Engineered for heavy-duty hydronic heating environments, the Danfoss 193B-1704 serves as a direct replacement part for maintaining boiler return temperature control, ensuring consistent thermal stratification in storage tanks and preventing thermal shock to the heat exchanger during cold start-up cycles.

• Optimized Combustion: Maintains the boiler at 140°F to ensure peak efficiency and full carbon burn-off.
• Corrosion Protection: Prevents low-temperature corrosion by keeping return water above the dew point.
• Passive Operation: Reliable thermostatic wax element operates autonomously without the need for electrical wiring or sensors.
• System Longevity: Reduces thermal stress on boiler welds and components during rapid heating cycles.
• Drop-In Compatibility: Designed specifically for VTC511 valve bodies used in various biomass and wood-fired applications.

What happens if the Danfoss 193B-1704 fails?
A failed element usually results in a boiler that overshoots its target temperature or fails to reach operating temperature, often causing heavy creosote buildup in the chimney due to low return temperatures.

Is the 140F opening temperature adjustable?
No, this is a fixed-temperature thermal element. If a different opening temperature is required, a different model element must be installed in the valve body.

Can this element be replaced without removing the VTC511 valve body?
Yes, once the system is isolated and drained down, the cap can be removed to swap the 193B-1704 element without cutting the surrounding piping.

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.