Bard S8406-105 Control

The Bard S8406-105 is a high-precision low ambient fan cycle control engineered to regulate condenser fan operation in external cooling environments. Designed as the direct OEM replacement for 8406-105, this pressure-actuated switch is critical for maintaining stable head pressure when outdoor temperatures drop below standard operating thresholds. By cycling the fan motor, the S8406-105 prevents evaporator coil freeze-ups and ensures consistent refrigerant flow, effectively eliminating the risk of short cycling and nuisance safety trips in Bard wall-mount air conditioners and heat pumps. This updated HVAC pressure switch is essential for mission-critical applications where cooling is required year-round, such as telecom shelters and equipment rooms. Integrating this condenser fan cycling control into your low ambient kit restores factory-spec performance and safeguards the compressor against oil migration and liquid slugging. Verify your specific unit’s wiring diagram to ensure compatibility with Bard HVAC replacement parts before installation.

• System Stability: Maintains optimal head pressure during low-temperature operation to prevent system lockout.
• OEM Compatibility: Serving as the updated Bard 8406-105, it fits seamlessly into existing control kits for wall-mount units.
• Equipment Protection: Reduces wear on the compressor by preventing liquid refrigerant return in cold weather.
• Reliable Performance: Pressure-based switching provides more accurate fan modulation than temperature-only sensors.

• Is the S8406-105 a direct swap for my older 8406-105? Yes, the S8406-105 is the official updated version specifically designed to replace the legacy 8406-105 model and functions identically within the circuit.
• Why is my condenser fan cycling off and on in cold weather? This is the intended operation of the fan cycle control to keep head pressures high enough for the expansion valve to meter refrigerant correctly when ambient air is too cold to provide natural regulation.
• Can I use this on non-Bard equipment? While technically a pressure switch, this part is calibrated for the specific pressure setpoints required by Bard wall-mount HVAC systems and is recommended for OEM applications.

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.