Bard MC4002-A Control

The Bard MC4002-A is a professional-grade solid state dual unit lead/lag controller engineered for precision sequence management in redundant HVAC systems. Designed as the direct replacement for MC4000-A and MC4001-A, this advanced controller provides automated control over two independent units, ensuring equalized run time and automatic switch-over during mechanical failure. The integrated base alarm board offers critical diagnostic outputs for remote monitoring, essential for telecommunications shelters and mission-critical server rooms. It operates on 24VAC control voltage and features adjustable staging delays and temperature setpoints to optimize efficiency and equipment longevity. This HVAC lead/lag controller supports a variety of Bard wall-mount units, providing stable environmental control without the complexity of third-party integration boards. By managing dual-compressor staging and emergency ventilation functions, the MC4002-A ensures continuous operation even during peak thermal loads or component malfunctions.

• Automatic Lead/Lag Sequencing: Balances run hours between two units to prolong compressor lifespan.
• Redundant System Protection: Triggers the secondary unit automatically if the primary unit fails to maintain the setpoint.
• Integrated Alarm Logic: Features dry contacts for remote notification of power loss or high-temperature events.
• Direct Compatibility: Engineered specifically for seamless integration with Bard wall-mount heat pumps and air conditioners.
• Solid State Reliability: Eliminates mechanical wear points found in traditional relay-based switching systems.

Is the MC4002-A backward compatible with older Bard setups?
Yes, the MC4002-A is the designated direct replacement for the MC4000-A and MC4001-A models, utilizing similar wiring terminals for straightforward field upgrades.

How do I set the lead unit rotation frequency?
The controller allows for manual selection or automatic rotation. On-site technicians can configure the timer settings to switch the lead unit every 1 to 30 days depending on the specific site requirements.

Does this controller support emergency shutdown interfaces?
Yes, the board includes terminals for fire alarm or smoke detector interlocks, allowing for immediate system shutdown during emergency conditions.

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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.