Johnson Controls A11E-6 Temperature Control

The Johnson Controls A11E-6 is a heavy-duty Mechanical Low Temperature Cutout Freezestat engineered specifically for identifying potential icing conditions in hydronic and cooling coils. As a veteran-grade HVAC protection control, this unit features a Single Pole Double Throw (SPDT) switch configuration, allowing for simultaneous fan shutdown and alarm circuit activation upon hitting the low-limit threshold. The 35°F to 45°F adjustable cutout range and 12°F fixed differential provide stable, reliable performance without the nuisance tripping found in inferior components.

Equipped with a 20-foot sensing element on a 4-foot capillary, the A11E-6 ensures comprehensive coverage across the air stream. The vapor-charged sensor is designed to react to the coldest 16-inch section, making it an essential safeguard for air handling units. With an automatic reset feature, the control resumes operation once the sensed temperature rises safely above the setpoint, minimizing downtime for your customers while providing critical equipment protection across 24 to 277Vac applications.

• Vapor-Charged Sensing: The 20' copper element responds to the coldest 16" area to provide reliable coil freeze protection.
• Automatic Reset Logic: Eliminates manual intervention by automatically recycling once temperatures exceed the 12°F differential.
• Versatile Electrical Compatibility: SPDT contacts support pilot duty or motor loads up to 277Vac for broad system integration.
• Environmental Resilience: The enclosure and capillary are unaffected by ambient temperature fluctuations at the control head.
• Simplified Calibration: Features a direct-reading scale and an easily accessible adjustment screw at both the top and bottom.

What is the best way to install the sensing element for maximum protection?
Technicians should serpentine the 20' element horizontally across the downstream face of the coil. It is critical to ensure the element covers the lower 6 inches of the coil where cold air tends to settle.

Can this control be used as a primary operating thermostat?
The A11E-6 is specifically a low-limit safety cutout. While it features SPDT contacts, its primary design function is as a safety limit to prevent catastrophic coil damage from freezing.

How does the automatic reset function differ from the manual reset models?
The "E" suffix designates an automatic reset. Unlike manual reset versions that require a physical trip of the lever, this unit will automatically close the circuit once the temperature rises 12°F above your setpoint.

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.