Siemens Building Technology 134-1510 Thermostat

The Siemens Building Technology 134-1510 is a heavy-duty low temperature detection thermostat designed to protect hydronic heating coils, cooling coils, and liquid pipes from specialized freeze-up conditions. Engineered for precision, this freeze stat features a 20-foot vapor-filled capillary element that triggers the switch if any one-foot section of the bulb senses a temperature below the setpoint. This makes it a critical component for monitoring large coil surfaces where air stratification often leads to localized freezing. The unit operates with a Single-Pole Double-Throw (SPDT) switch, allowing for simultaneous fan shutdown and alarm circuit activation upon detection. With an automatic reset function and an adjustable setpoint range of 35°F to 45°F, it ensures consistent HVAC freeze protection without the need for manual intervention once temperatures return to safe levels. The rugged steel housing and electroplated copper capillary provide the durability required for intensive industrial and commercial air handling applications.

• Averaging Sensing Logic: Any 12-inch segment of the 20-foot capillary sensing a drop below the 35/45F setpoint will actuate the SPDT switch.
• Versatile Electrical Compatibility: Capable of switching 120/240 VAC or 24 VAC, making it compatible with most standard HVAC safety circuits and BAS controllers.
• Precise Setpoint Control: Features a 12°F fixed differential with an adjustable concealed range to prevent frequent cycling and tampering.
• Simplified Installation: Includes a universal mounting bracket and can be mounted in any orientation, though vertical is preferred for optimal capillary routing.
• Reliable Construction: The electroplated copper tube ensures maximum thermal sensitivity and resists corrosion in high-moisture environments.

How does the automatic reset function operate on the 134-1510?
Once the temperature across the entire 20-foot capillary rises above the setpoint plus the 12°F differential, the 134-1510 will automatically restore the circuit to the normal operating position without manual reset.

Can this thermostat be used for both high and low voltage applications?
Yes, this electric low temperature detection thermostat is rated for pilot duty at 24 VAC up to 277 VAC, as well as inductive loads at 120 and 240 VAC, providing flexibility for diverse wiring requirements.

What happens if the capillary is kinked during installation?
A kink in the capillary can restrict the vapor charge movement, leading to inaccurate sensing or failure to actuate. It is vital to maintain a minimum bend radius and ensure the 20' capillary is distributed evenly across the coil face to avoid blind spots.

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.